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6/25/2018 7:04:05 PM
Posted: 4/15/2018 10:29:25 AM EDT
I have a 308 dpms platform rifle I built about a year or 2 ago. I haven’t shot it much but I sighted it in at 100 yards. It’s a stainless 18” 308 1/10 twist. I was using 168gr off the shelf and I could put 3 shots in a hold the size of a golf ball. However I’m thinking about 175gr as I hear it shoots flatter long range. I’m hoping to exercise this rifle past 600 yards soon. Would 175 be better our past 600 yards with this barrel length?
Link Posted: 4/15/2018 10:49:29 AM EDT
No real way to know until you try. Your barrel will let you know if it prefers 175 to 168.
Link Posted: 4/15/2018 10:59:48 AM EDT
I don't know about an 18" barrel, but I have seen a couple of guns shoot to the same POI out to 600 with FGGM 168/175.
Link Posted: 4/15/2018 10:57:46 PM EDT
If MatchKings, I would.
Link Posted: 4/16/2018 2:39:27 AM EDT
[Last Edit: 4/16/2018 2:39:47 AM EDT by waynelte]
I was thinking about buying some 175 matchkings. I was also looking to get out to 800-900 yards with the gun. That’s about the limit with this setup. I really wish it was an 20” barrel.
Link Posted: 4/16/2018 9:55:09 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By waynelte:
I was thinking about buying some 175 matchkings. I was also looking to get out to 800-900 yards with the gun. That’s about the limit with this setup. I really wish it was an 20” barrel.
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I shoot 155’s and 168’s exclusively with good performance from my 18” Rainier barrel.

850 yards at my location is where the 168 runs out of gas, the 175 gets me out a bit further based off StrelokPro. As others have said you should try them and see what happens. A 20” barrel in a .308 wouldn’t give you a drastic bump in performance IMO. Maybe an extra 75 FPS, maybe a bit more of you’re lucky.
Link Posted: 4/16/2018 10:39:10 PM EDT
Yes.
Link Posted: 4/17/2018 9:29:27 AM EDT
The 155 TMK should get you there. It's pretty slippery.
Link Posted: 4/20/2018 12:08:08 PM EDT
try some Black Hills 175gr, see how it works for you. It is some damn good ammo.
Link Posted: 6/10/2018 10:45:21 AM EDT
If you have access to a chrono, I would use it to see what kind of velocity you are getting from the 168gr round and then shoot the 175gr. The 175gr will be just a tad slower and you can extrapolate from the info at what point the 175gr will go subsonic. Make sense?

You could always swap out for a longer barrel...

I shoot 175SMK exclusively out of a 24 inch barrel and it will get me out beyond 1000yds...1150 yds is the longest I have taken it.
Link Posted: 6/10/2018 10:57:47 AM EDT
[Last Edit: 6/10/2018 10:58:24 AM EDT by Demphna2]
I have an 18" BA Hanson barrel. Initially tried 168 BTHP that shot lights out. Worked up a load for it and called it good. Just recently worked up a load with the 168 ELDs as the BC was better, and according to Strelok, will get me out to 1150 yards at my location. Have not tried it yet though. Thought about switching to 175s early on, but this barrel just shoots the shit out of the 168s. My recommendation: get some factory ammo in both weights and see what it likes.
Link Posted: 6/10/2018 12:59:21 PM EDT
I originally shot 168SMK...but found the 175SMK outperforms at all distances and wind. Its the only round I shoot out of my 308.
Link Posted: 6/10/2018 2:11:29 PM EDT
in my 18.5" bolt gun I played with 155 tmk's, 168 amax's, and 175 rdf's using 8208xbr, varget and pp2000mr. best results were from the 175 rdf clocking in 2545 with 8208xbr, 210m, and single digit es/sd. br2's had a tighter group but with es/sd in the upper teens low 20's.

in a 16" gas gun my favorite load was the 168 amax with pp2000mr. it yeilded the best accuracy and ballistics (this one I tried 155 and 178 amax's also)
Link Posted: 6/11/2018 7:28:12 PM EDT
For .308 Win., twist rate and BC are more important than barrel length.

I almost don't care what the barrel length is, unless we're talking F-Class.

I will have higher hit percentage with a 16" 1/9 twist with 185 Bergers or some of the newer, mid .5 G1 or higher BC bullets, compared to a 24" 1:11.25" twist shooting 168s or 175s even.

175hr SMK is much better at distance than 168gr SMK, provided you spin it with at least a 1:11.25" twist, and preferably a 1:10" twist.

I don't personally mess with .308 anymore other than attendees' guns, but if I was going to build one, it would be as short of a barrel for the overall weapon profile I was looking for, with a 1:9 twist.
Link Posted: 6/29/2018 4:31:05 AM EDT
I've been shooting a 16" gas gun out to 1025 yards using 175's with pretty good results.

I am using factory LR-118 and getting consistent hits on a steel target 20" x 40".

Hope this helps...
Link Posted: 6/30/2018 3:46:09 PM EDT
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By LRRPF52:
For .308 Win., twist rate and BC are more important than barrel length.

I almost don't care what the barrel length is, unless we're talking F-Class.

I will have higher hit percentage with a 16" 1/9 twist with 185 Bergers or some of the newer, mid .5 G1 or higher BC bullets, compared to a 24" 1:11.25" twist shooting 168s or 175s even.

175hr SMK is much better at distance than 168gr SMK, provided you spin it with at least a 1:11.25" twist, and preferably a 1:10" twist.

I don't personally mess with .308 anymore other than attendees' guns, but if I was going to build one, it would be as short of a barrel for the overall weapon profile I was looking for, with a 1:9 twist.
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This guy speaks truth. My AI has a 17" 1:10 barrel. Especially if you hand load you can get the velocity without needing 20"+ to burn all the powder. Shorty .308 are hawt!
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