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8/20/2026 4:10:52 PM EDT
[#1]
300 BLK supers with a can are much quieter than 5.56 with a can. Especially with the same barrel-length. But that's not really fair since 5.56 needs a longer barrel.
Atypical Millennial
8/20/2026 4:41:28 PM EDT
[#2]
A lot of people tend to sleep on the supersonic side of 300blk.  
Subs get all of the hype, and subs are fine, but on a cost vs performance aspect (ignoring platform), .45 or 9mm HST are hard to beat per trigger pull compared to good expanding 300blk subs.  Mostly because 9mm/.45 ae 1/3rd to 1/6th of the price of "good subs".  Especially the WC/Lehigh 194's.     Those things are really good but $3.00-$3.50 per trigger pull.

Discreet Ballistics 188's are really  good, and are about $2.25 a trigger pull.
Maker Rex 200gr NAS3 are really good and run $2.20 per trigger pull.
Maker Rex 242gr NAS3 are really good and run $2.40 per trigger pull.
Hornady 190gr Sub-X are "meh" but run  as low as $1.50 per shot.

Where 300blk wins is range and accuracy (and platform).

Supers on the other hand don't get enough credit for how well they function out of short barrels, both suppressed and unsuppressed.   That was the big selling point to me.  An 8" 300blk is a legit weapon easily  operating within its designed performance envelope, not a meme flashbang.
110gr Tac-tx can be expensive, but it is the gold standard.  

Oddly enough, I have come to the conclusion that a lot of the NAS3 cased Tac-tx is as good (if not better) a buy than the Barnes brass versions.    I ended up grabbing the NAS3 cased 120gr Tax-tx.  It chrono'd at 2250  fps out of my 10.5".   I have NAS3 110gr Tac-tx as well, but didn't chrono it.
NAS3 cases are a cheat code for 300blk.

AAC loaded V-max, Varminter/JHP and even the 125gr Winchester Open Tips are good close-range (HD) performers at a cheaper price point.  

Basically, don't sleep on the supers.  
8/20/2026 4:45:19 PM EDT
[#3]
Quote History
Originally Posted By swampvol:
After years of searching for the "best" HD weapon I built an 8.3" 300blk, suppressed it, and finally found what I was searching for.
View Quote

And with the new rulings on SBRs and suppressors, I’d think there may be even more interest in 300BLK
8/20/2026 4:57:48 PM EDT
[#4]
Quote History
Originally Posted By panthermark:
A lot of people tend to sleep on the supersonic side of 300blk.  
Subs get all of the hype, and subs are fine, but on a cost vs performance aspect (ignoring platform), .45 or 9mm HST are hard to beat per trigger pull compared to good expanding 300blk subs.  Mostly because 9mm/.45 ae 1/3rd to 1/6th of the price of "good subs".  Especially the WC/Lehigh 194's.     Those things are really good but $3.00-$3.50 per trigger pull.

Discreet Ballistics 188's are really  good, and are about $2.25 a trigger pull.
Maker Rex 200gr NAS3 are really good and run $2.20 per trigger pull.
Maker Rex 242gr NAS3 are really good and run $2.40 per trigger pull.
Hornady 190gr Sub-X are "meh" but run  as low as $1.50 per shot.

Where 300blk wins is range and accuracy (and platform).

Supers on the other hand don't get enough credit for how well they function out of short barrels, both suppressed and unsuppressed.   That was the big selling point to me.  An 8" 300blk is a legit weapon easily  operating within its designed performance envelope, not a meme flashbang.
110gr Tac-tx can be expensive, but it is the gold standard.  

Oddly enough, I have come to the conclusion that a lot of the NAS3 cased Tac-tx is as good (if not better) a buy than the Barnes brass versions.    I ended up grabbing the NAS3 cased 120gr Tax-tx.  It chrono'd at 2250  fps out of my 10.5".   I have NAS3 110gr Tac-tx as well, but didn't chrono it.
NAS3 cases are a cheat code for 300blk.

AAC loaded V-max, Varminter/JHP and even the 125gr Winchester Open Tips are good close-range (HD) performers at a cheaper price point.  

Basically, don't sleep on the supers.  
View Quote


Agree completely.  My 300 is much more pleasant to shoot with supers at an 8" than my 556 is to shoot at 11.5.  Suppressed and unsuppressed.  
Also, perhaps with the exception of the Black 75gr bonded SBR ammo, 300 is going to be more effective through car glass.  
An 8" 300 with a suppressor is very easy to handle and the suppressor kills the muzzle blast better.
8/21/2026 8:19:01 AM EDT
[#5]
Originally Posted By panthermark:
A lot of people tend to sleep on the supersonic side of 300blk.  
Subs get all of the hype, and subs are fine, but on a cost vs performance aspect (ignoring platform), .45 or 9mm HST are hard to beat per trigger pull compared to good expanding 300blk subs.  Mostly because 9mm/.45 ae 1/3rd to 1/6th of the price of "good subs".  Especially the WC/Lehigh 194's.     Those things are really good but $3.00-$3.50 per trigger pull.

Discreet Ballistics 188's are really  good, and are about $2.25 a trigger pull.
Maker Rex 200gr NAS3 are really good and run $2.20 per trigger pull.
Maker Rex 242gr NAS3 are really good and run $2.40 per trigger pull.
Hornady 190gr Sub-X are "meh" but run  as low as $1.50 per shot.

Where 300blk wins is range and accuracy (and platform).

Supers on the other hand don't get enough credit for how well they function out of short barrels, both suppressed and unsuppressed.   That was the big selling point to me.  An 8" 300blk is a legit weapon easily  operating within its designed performance envelope, not a meme flashbang.
110gr Tac-tx can be expensive, but it is the gold standard.  

Oddly enough, I have come to the conclusion that a lot of the NAS3 cased Tac-tx is as good (if not better) a buy than the Barnes brass versions.    I ended up grabbing the NAS3 cased 120gr Tax-tx.  It chrono'd at 2250  fps out of my 10.5".   I have NAS3 110gr Tac-tx as well, but didn't chrono it.
NAS3 cases are a cheat code for 300blk.

AAC loaded V-max, Varminter/JHP and even the 125gr Winchester Open Tips are good close-range (HD) performers at a cheaper price point.  

Basically, don't sleep on the supers.  
View Quote
I agree with this about supersonics. Although not a short barrel my 16" CZ Trail 300blk has been a hammer as my do all PA woods rifle. Both 110gr Hornady V-max for varmints and Barnes 110/120 Vor-tx on larger game is higjly effective. I get alot flak from folks saying anything longer than SBR length barrel is wasted but I can say for sure that exrra FPS from the 16" has made 300blk DRT in my uses. In PA we have restrictions on semiauto hunting so the ideal 8" barrel AR in 300blk is not an option. I did consider SBRing CZ Trail and cutting it down.....until I started really using it with supers.
8/26/2026 8:39:01 AM EDT
[#6]
Quote History
Originally Posted By willi3d:


I guess they aren’t running suppressors, then.   Seems like heavy subsonic 9mm hollow point would be more effective at short ranges when suppressed.  The .300 BO supersonic rounds seem more effective for self defense, but running supers negates some of the advantages of the cartridge.
View Quote

No
8/26/2026 8:40:29 AM EDT
[#7]
Quote History
Originally Posted By wlderdude:
300 Body Odor is one cartridge I'll be avoiding for now.  It does have some cool features like being able to be resized from 223 brass, and it really makes sense for subsonic applications.  

But the risk of a 300 BO finding its way into a 223/5.56 chamber is just too great.  It's one of the few times where mixing up ammo will blow up a gun, and the internet is full of pictures where it has happened.  Here's how 300 BO round fits snuggly into a 223 chamber from which it cannot fit down the bore.  

https://i.redd.it/aby0wzjgcz0y.jpg

To answer the OP's question, no I don't think the 300 Body Odor is falling out of fashion, it looks as though it has carved out a permanent place in the lineup of calibers.  

Don't let my crusty attitude keep anyone from enjoying his or her favorite gun.  Maybe you have a way to make sure things don't get mixed up.  It's just not worth the risk for me.
View Quote

LOL

If you cannot tell what rifle, ammo and mags you’re about to pull the trigger on, you should just get rid of your guns now.
8/26/2026 8:45:48 AM EDT
[#8]
Knights REALLY needs to bring back a 300BLK factory gun in the KS series. And a short, fat, purpose-engineered 300BLK can.

8.5-9.5 SR-30 KS-3 please.
8/26/2026 8:48:45 AM EDT
[#9]
Quote History
Originally Posted By Brahmzy:
Knights REALLY needs to bring back a 300BLK factory gun in the KS series. And a short, fat, purpose-engineered 300BLK can.

8.5-9.5 SR-30 KS-3 please.
View Quote

I’m hoping for a YHM Fat Cat in 30 caliber.
I don't see no Americans. I see trespassers.
8/26/2026 3:44:09 PM EDT
[#10]
Switched out my 10.5" BA barrel as it was leaving a weird ring around the neck of the brass to a Green Mountain 11.5" and it is showing great promise as an accurate deer slayer. I mainly use it for woods deer hunting and only shoot 110/125 supers from it. With a 9mm suppressed Stribog, I just don't see the need to shoot sub 300 BO. I do have heavier FMJ .308 bullets that I may load up down the road since I don't shoot much .308 anymore.
9/4/2026 11:19:47 AM EDT
[#11]
Quote History
Originally Posted By Brahmzy:
Knights REALLY needs to bring back a 300BLK factory gun in the KS series. And a short, fat, purpose-engineered 300BLK can.

8.5-9.5 SR-30 KS-3 please.
View Quote


I'm wanting a Geissele GDP. Even though overpriced for what it is imo.

Ordered a Rattler LT and cancelled it. I think the weight is going to bug me, and not worth the trade off for a foldable.

300 bo ain't dead to me, but I only run supers in short barrels
9/15/2026 1:00:18 PM EDT
[Last Edit: DevL][Edited] [#12]
The 110 TAC-TX is really why the caliber is even viable IMO.

300 BLK vs 5.56 for supers let's you run a reliable rifle up to 2" shorter or gives you 20% more muzzle energy at the same barrel length. Negative is the 300 BLK has little terminal performance past 300y and drops like a stone and gets tossed by wind.

For subs, 300 BLK is FAR FAR FAR more accurate than 9mm or 45 ACP sub guns. For example... there is no such thing as a sub MOA sub gun. But you CAN shoot sub MOA subs  in 300 BLK! This makes it much more effective at 75-125 yards which is the max you would use subs for one shot stops due to drop and wind drift killing your first round hit probability.

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