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Posted: 5/21/2023 8:20:56 PM EDT
Looking for input on a 10.5" upper. Already have one in 5.56, but I'm seriously considering getting rid of it in favor of building a 10-10.5" .300blk upper. I don't want to go longer than 10.5" so a 11.5 or 12.5 in 5.56 are out.

Which makes more sense for HD and medium game hunting at distances 150yrds or less? Would like to get a suppressor at some point.

I have a pretty large stock of 55grn Gold Dot, but not much by way of heavier bullets. The .300blk has superior ballistics with supers, however, with 77grn 5.56 the gap is pretty small.

The 10.5" is pretty violent in terms of muzzle pressure, component wear, etc. Would the .300blk be any better?

What say you?
Link Posted: 5/21/2023 8:47:59 PM EDT
[#1]
Except for price and availability of ammunition 300 blk is a better round for everything you describe.
Link Posted: 5/21/2023 8:54:12 PM EDT
[#2]
I think 77gr tap is going to be pretty close in price to what you'd pay for 300blk.  I faced this same decision and went 300blk due to it being less blasty from short barrel.  I've got a 22lr upper for plinking
Link Posted: 5/21/2023 8:57:20 PM EDT
[#3]
IMHO  no comparison between 10.5” in  5.56 vs 300BO at 150 or less.

A 300 Rocking 110 grn TSX supers  is devastating.

Once you get a can, and you’re chasing quite, the 220 grn subs are WAY quieter.

BO  functions better in shorter length bbl’s,   throws less fire ball unsuppressed, it also doesn’t heat up your can as much when suppressed.

Only con I see is ammo cost and availability.
Link Posted: 5/21/2023 9:18:56 PM EDT
[#4]
I'm a reloader so I can roll some of my own .300blk. This would help the financial aspect of ammo, at least for practice use.

Would likely run factory ammo for most HD purposes.
Link Posted: 5/21/2023 10:31:14 PM EDT
[#5]
I have a 8" suppressed upper and a 4.7" upper with blast can for PDW use in 300 Blackout. I also reload plink and defense rounds.
Link Posted: 5/21/2023 10:36:08 PM EDT
[#6]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I'm a reloader so I can roll some of my own .300blk. This would help the financial aspect of ammo, at least for practice use.

Would likely run factory ammo for most HD purposes.
View Quote



If you eliminate the discussion over the cost/availability of ammo, the 300 BLK is the obvious answer.  Even taking the cost/availability of ammo into consideration, the 300 BLK is still the correct answer.
Link Posted: 5/21/2023 11:25:00 PM EDT
[#7]
.300 Blackout is the answer for a short rifle. Better versatility, energy, vastly better suppression, and you won't have the fireball of unburnt powder exiting the muzzle like 5.56. The only con is the increase in the cost of ammo. Whether that matters or not is up to you. The shooting experience of .300 Blackout is much better than a short 5.56. Blackout is designed to operate within those barrel lengths, where 5.56 is not. I'd wager that will translate into the wear and tear on the system.
Link Posted: 5/21/2023 11:41:09 PM EDT
[#8]
Probably 300 blackout with good ammo. I’d say it’s what most close range AR hog hunters are using, especially at night. I prefer .308, unless you’re talking coyotes, then I’d take 5.56.
Link Posted: 5/22/2023 1:19:51 AM EDT
[#9]
Keep the 5.56 upper buy a Palmetto State Armory 300 BO upper.
Link Posted: 5/22/2023 7:17:36 AM EDT
[#10]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Keep the 5.56 upper buy a Palmetto State Armory 300 BO upper.
View Quote


Ironically, I already have an unfired PSA 8.5" .300blk upper new in the box that I got in a trade, but I want a slightly longer barrel for handguard space (although I could just get a blast can and reuse the handguard I already have). I'm leaning toward a Ballistic Advantage 10.3" Hanson barrel in .300 BO.
Link Posted: 5/22/2023 7:56:13 AM EDT
[#11]
My original 10.5" 5.56 upper is now  a.22LR upper.
My SHTF weapon is a 10.5" 300blk.
I have another unfired 10.5" 5.56 upper but it will be sold or buried.

300blk is the answer you seek.
Link Posted: 5/22/2023 8:13:19 AM EDT
[#12]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
300blk is the answer you seek.
View Quote

I agree. I leave the 5.56mm for 14.5" or longer builds. SBR's are 300blk or 9mm. I would suggest a 9" over a 10.5" for a 300blk SD build.
Link Posted: 5/22/2023 8:28:54 AM EDT
[#13]
300BLK is the answer and PSA has good ammo prices and shipping with their AAC ammo brand.
Link Posted: 5/22/2023 10:04:53 AM EDT
[#14]
Might use the $$ from selling my 5.56 upper for some AAC .300blk ammo.
Link Posted: 5/22/2023 10:23:08 AM EDT
[#15]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Ironically, I already have an unfired PSA 8.5" .300blk upper new in the box that I got in a trade, but I want a slightly longer barrel for handguard space (although I could just get a blast can and reuse the handguard I already have). I'm leaning toward a Ballistic Advantage 10.3" Hanson barrel in .300 BO.
View Quote


That can be done by tucking a sound forwarding muzzle device inside the handguard.  I did just that with an 8.3", 9mm barrel so I could use a 10" handguard.  Muzzle velocity wasn't a concern with 9mm tho.  If you want to maximize velocity, obviously a longer barrel would be the answer.
Link Posted: 5/22/2023 10:44:44 AM EDT
[#16]
I run a BA 10.3 Hanson.

Excellent BBL, however I had to open up the gas port to get it to cycle the way I wanted.
Still within GP specs but went from the small end to the big end.

Link Posted: 5/22/2023 11:47:50 PM EDT
[#17]
If you reload, 300 no question, and as a reloader, go spend $39 at Harbor Freight and get that mini chop saw.  Get a jig and cut 5.56/223 cases to length and make your own 300 brass.  If you do that, you'll reload 300 blk for about the same as reloading 5.56/223.  No need to stress over same brand brass or all the other fastidious stuff for subsonic 300 since you're not trying to hit a gnat's balls at 500 yards.

Dunno about your area, but around here, there's more range pickup 5.56 and 223 brass than I can carry.  The only thing to watch for is the cases with the extra tiny flash hole, that'll wreck your decapping pin in a heart beat.
Link Posted: 5/23/2023 12:04:51 AM EDT
[#18]
I'm a fan of, and own both. I've learned that I like my .300 shorter and 5.56 longer than 10"

Get a 5.56 can first. That setup you will get a lot more mileage out of, because it's cheaper to shoot. Effective to 100ish with nearly all ammo and well beyond that with good ammo that cost the same as cheap .300 ammo.

Why the 10" barrel for .300? The biggest benefit for .300 IMHO is that you can have very good ballistics, with supers, down to 7" or so. Combine that with a K can and you get something shorter and better ballistics than a 10" 5.56. Perfect for HD in my opinion. A 10" with most cans is right around the same oal as a standard 16" rifle. Not terrible, but a tad on the long side indoors.
Link Posted: 5/23/2023 7:26:11 AM EDT
[#19]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
If you reload, 300 no question, and as a reloader, go spend $39 at Harbor Freight and get that mini chop saw.  Get a jig and cut 5.56/223 cases to length and make your own 300 brass.  If you do that, you'll reload 300 blk for about the same as reloading 5.56/223.  No need to stress over same brand brass or all the other fastidious stuff for subsonic 300 since you're not trying to hit a gnat's balls at 500 yards.

Dunno about your area, but around here, there's more range pickup 5.56 and 223 brass than I can carry.  The only thing to watch for is the cases with the extra tiny flash hole, that'll wreck your decapping pin in a heart beat.
View Quote


I already have the HF chop saw, jig, dies, and a case trimmer. Made a couple 100 .300blk cases so far. Will be buying a mold to cast my own bullets as well. Basically, for practice ammo, I'll be paying for the powder and primer as I can get cases and lead for free. Hunting rounds will require me to buy bullets.
Link Posted: 5/23/2023 7:32:26 AM EDT
[#20]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I'm a fan of, and own both. I've learned that I like my .300 shorter and 5.56 longer than 10"

Get a 5.56 can first. That setup you will get a lot more mileage out of, because it's cheaper to shoot. Effective to 100ish with nearly all ammo and well beyond that with good ammo that cost the same as cheap .300 ammo.

Why the 10" barrel for .300? The biggest benefit for .300 IMHO is that you can have very good ballistics, with supers, down to 7" or so. Combine that with a K can and you get something shorter and better ballistics than a 10" 5.56. Perfect for HD in my opinion. A 10" with most cans is right around the same oal as a standard 16" rifle. Not terrible, but a tad on the long side indoors.
View Quote



The reason for wanting a 10-10.5" .300blk is that I like having a 9" handguard, which, as has been pointed out, can be achieved by putting a on a blast can to extend the end of the barrel beyond the end of the handguard. Additionally, the 10-10.5" .300blk gives you 16" 5.56 ballistics. You do have a good point about the OAL once a suppressor is installed.
Link Posted: 5/23/2023 12:41:47 PM EDT
[#21]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I'm a fan of, and own both. I've learned that I like my .300 shorter and 5.56 longer than 10"

Get a 5.56 can first. That setup you will get a lot more mileage out of, because it's cheaper to shoot. Effective to 100ish with nearly all ammo and well beyond that with good ammo that cost the same as cheap .300 ammo.

Why the 10" barrel for .300? The biggest benefit for .300 IMHO is that you can have very good ballistics, with supers, down to 7" or so. Combine that with a K can and you get something shorter and better ballistics than a 10" 5.56. Perfect for HD in my opinion. A 10" with most cans is right around the same oal as a standard 16" rifle. Not terrible, but a tad on the long side indoors.
View Quote

I've been eyeballing an 11.3" barrel.
I have 10.5", a 9", an 8.5", an 8.3", and a 7.5" in 300blk already.

For me, it is for the increased velocity and reduced muzzle blast/flash/recoil, along with more rail space.
As an example, 5 shots of Wilson Combat loaded 110gr Tac-tx chrono'd 2261 fps out of my brand new, never been fired 10.5" barrel.   Since my 10.5" 300blk is my SHTF weapon, that velocity (coupled with that ammo) is good out to 200 yards (1735 fps, 735 ft.lb at 200y), and is still decent out to 300 yards (1501 fps, 566 ft.lb) where it within the full expansion thresholds. It is probably expanding out to 350 yards/+300 meters.  That (for me) pushes the round beyond pure "HD/PDW" range.

My 9" is for HD (110gr V-max), while my 7.5" has a LAW Folder and is for a backpack (115gr Controlled Chaos).

Link Posted: 5/23/2023 1:09:07 PM EDT
[#22]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

I've been eyeballing an 11.3" barrel.
I have 10.5", a 9", an 8.5", an 8.3", and a 7.5" in 300blk already.

For me, it is for the increased velocity and reduced muzzle blast/flash/recoil, along with more rail space.
As an example, 5 shots of Wilson Combat loaded 110gr Tac-tx chrono'd 2261 fps out of my brand new, never been fired 10.5" barrel.   Since my 10.5" 300blk is my SHTF weapon, that velocity (coupled with that ammo) is good out to 200 yards (1735 fps, 735 ft.lb at 200y), and is still decent out to 300 yards (1501 fps, 566 ft.lb) where it within the full expansion thresholds. It is probably expanding out to 350 yards/+300 meters.  That (for me) pushes the round beyond pure "HD/PDW" range.

My 9" is for HD (110gr V-max), while my 7.5" has a LAW Folder and is for a backpack (115gr Controlled Chaos).

View Quote


I honestly doubt you are going to see a significant increase in velocity with another 8 tenths of an inch in length, nor a reduction in the rest.  But, any reason is a good reason for another gun
Link Posted: 5/23/2023 1:19:12 PM EDT
[#23]
Both are grossly unpleasant to shoot unless they are suppressed.
Link Posted: 5/23/2023 1:56:09 PM EDT
[#24]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Both are grossly unpleasant to shoot unless they are suppressed.
View Quote

They both suck, but 5.56 is WAY worse....at least is you are stuck in Illinois where you can't have a suppressor (yet) and you shoot indoors.  
Link Posted: 5/23/2023 7:10:00 PM EDT
[#25]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

I've been eyeballing an 11.3" barrel.
I have 10.5", a 9", an 8.5", an 8.3", and a 7.5" in 300blk already.

For me, it is for the increased velocity and reduced muzzle blast/flash/recoil, along with more rail space.
As an example, 5 shots of Wilson Combat loaded 110gr Tac-tx chrono'd 2261 fps out of my brand new, never been fired 10.5" barrel.   Since my 10.5" 300blk is my SHTF weapon, that velocity (coupled with that ammo) is good out to 200 yards (1735 fps, 735 ft.lb at 200y), and is still decent out to 300 yards (1501 fps, 566 ft.lb) where it within the full expansion thresholds. It is probably expanding out to 350 yards/+300 meters.  That (for me) pushes the round beyond pure "HD/PDW" range.

My 9" is for HD (110gr V-max), while my 7.5" has a LAW Folder and is for a backpack (115gr Controlled Chaos).

View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
I'm a fan of, and own both. I've learned that I like my .300 shorter and 5.56 longer than 10"

Get a 5.56 can first. That setup you will get a lot more mileage out of, because it's cheaper to shoot. Effective to 100ish with nearly all ammo and well beyond that with good ammo that cost the same as cheap .300 ammo.

Why the 10" barrel for .300? The biggest benefit for .300 IMHO is that you can have very good ballistics, with supers, down to 7" or so. Combine that with a K can and you get something shorter and better ballistics than a 10" 5.56. Perfect for HD in my opinion. A 10" with most cans is right around the same oal as a standard 16" rifle. Not terrible, but a tad on the long side indoors.

I've been eyeballing an 11.3" barrel.
I have 10.5", a 9", an 8.5", an 8.3", and a 7.5" in 300blk already.

For me, it is for the increased velocity and reduced muzzle blast/flash/recoil, along with more rail space.
As an example, 5 shots of Wilson Combat loaded 110gr Tac-tx chrono'd 2261 fps out of my brand new, never been fired 10.5" barrel.   Since my 10.5" 300blk is my SHTF weapon, that velocity (coupled with that ammo) is good out to 200 yards (1735 fps, 735 ft.lb at 200y), and is still decent out to 300 yards (1501 fps, 566 ft.lb) where it within the full expansion thresholds. It is probably expanding out to 350 yards/+300 meters.  That (for me) pushes the round beyond pure "HD/PDW" range.

My 9" is for HD (110gr V-max), while my 7.5" has a LAW Folder and is for a backpack (115gr Controlled Chaos).



OP specified that he wanted it for HD and hunting 150 yards or less, that's why I questioned the barrel length choice... But he explained his logic.

Sounds like you have a bunch of cool guns.
Link Posted: 5/23/2023 7:47:56 PM EDT
[#26]
Why not both? I own both in 10.5. I train and shoot the 5.56 more, but the 300blk is a hell of al ot of fun with subs. For HD the 300blk with a can would be great, even with supers.
Link Posted: 5/23/2023 8:13:27 PM EDT
[#27]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Both are grossly unpleasant to shoot unless they are suppressed.
View Quote


Which is why my bedside AR is chambered in 9mm
Link Posted: 5/23/2023 10:24:14 PM EDT
[#28]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Both are grossly unpleasant to shoot unless they are suppressed.
View Quote

That's why mine are suppressed

And suppressed vs suppressed, it's not even close. The 300BLK with subs is a pellet gun quiet compared to the 5.56 and even with supers, there is a huge difference.
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