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bfm1851
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Posted: 10/1/2012 2:26:48 AM EST
I do not think i have a problem here but figured I would ask you guys. My .308 has a 1:11 twist, that should be fine for running bullets up to 178gr right? Wanting to try some 178 Amax for longer shooting
Thanks
mathecb
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Posted: 10/1/2012 2:49:50 AM EST
[Last Edit: 10/1/2012 2:50:09 AM EST by mathecb]
1:11 is fine for just about everything you would want to shoot out of a long range .308. 178's will be no problem.
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Rob01
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Posted: 10/1/2012 5:22:17 AM EST
11 twist will be fine the 178 AMAX but also try the Hornady 178 BTHP. It has a .530 BC.

With an 11 twist you should be able to go up to 210-220grn bullets but I like to use the 178grn weight in my .308. I use both the 178 AMAX and 178 BTHP. I have shot the 178 AMAX to 1300 yards out of my .308.
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bfm1851
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Posted: 10/1/2012 9:13:24 AM EST
Thanks for your help. Rob01 current load for this rifle is 43.5gr of varget. Good results (less then MOA) at 100, 200 and 300 with 168smk and hornady 168. Amax I think has a little better BC and I want to get out to 600yds. I have run as much as 44gr varget but not much more and really did not notice much if any improvment. I load about 0.010 off rifleing. I know all rifles are different but any advice? Thanks
smaddox
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Posted: 10/1/2012 11:11:33 AM EST
I have a 1:11.25 barrel on my rifle and it shoots 175gr smk's just fine.
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Rob01
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Posted: 10/1/2012 11:43:46 AM EST
Originally Posted By bfm1851:
Thanks for your help. Rob01 current load for this rifle is 43.5gr of varget. Good results (less then MOA) at 100, 200 and 300 with 168smk and hornady 168. Amax I think has a little better BC and I want to get out to 600yds. I have run as much as 44gr varget but not much more and really did not notice much if any improvment. I load about 0.010 off rifleing. I know all rifles are different but any advice? Thanks


Hodgdon listed Min/Max with Varget and the 168 weight bullets is Min 43grn and Max 46grns. Not saying you need to go higher but if you aren't getting pressure then you can. You might be at a lower accuracy node. Any pressure signs at 44grns?

Listed Min Max for the 175/178s is 42grns and 45grns respectively with most finding a good load between 43.5 and 44.5grns.

.010" off the lands is a good spot if you found it accurate. I usually start at .020" off and work from there.
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bfm1851
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Posted: 10/1/2012 2:17:42 PM EST
Rob01 I started out with 42 gr of varget and was shooting one hole groups at 100yrd (yea I know eveybody says that) but truely if I did my part my old savage did it's. Then I picked up this Tikka and still had great groups at 100yrds with 42. When I went out to 200 naturally groups opened up a little so I started experimenting again with different loads. I found that at 43.5gr I could shoot better at 200yrds, some times even getting as close as my 100yrd groups. So I moved out to 300yrds and plus got a good deal on a 8-32 benchrest nightforce scope. Wow what I was missing. Anyway couple weekends ago I went out, shot a few groups at 200 then moved to 300. Two groups of five, center to center of one was 1.619" and the other was 1.611". One was shot with 168gr amax and the other 178 amax. I forget which was which but close enough to say what differance. I am very happy with the results and started loading up some more of both for farther testing. Also going to load up some 168smk to see what they do. I have a local range here that goes out to 600 and that is what I want to try before this Glaucoma gets too bad.
I did not load many at 44 as I saw no great difference but there was also no pressure signs. Maybe I'll load up some at 44 and see if they perform better then 43.5. If I remember when I ran the 178's over the crony it was 2715fps. Sound right?
FALex
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Posted: 10/1/2012 4:40:03 PM EST
Rob - what are you pushing your 178 Amax's at when you're shooting them out to 1300? I was pushing 175 SMK's at 2650, curious to know if that would be a good velocity to try and achieve? Thanks.
Rob01
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Posted: 10/2/2012 4:45:16 AM EST
Yeah that velocity with the 178 sounds about right. I was more saying to bump up the 168 load as you are 2.5grns below max and not seeing pressure. You might find another accurate node higher. Just do it slow and watch for pressure. That said if you are happy with where its shooting and velocity then just load them up and have fun.

I always test my groups at 100 and 300 yards. I only have a 400 yard range but I have to shoot at matches out to 1000+. I have found over the years that if a load shoots good at 100 and 300 then it does well out to longer ranges.

FALex I was pushing them at 2730fps.
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