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Troubleshooting a .308 Win.

 
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  #1  
Old 08-02-2002, 08:58 PM
JPG JPG is offline
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Join Date: Mar 2002
Location: North Bend, Wa.
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Troubleshooting a .308 Win.

I have a Rem. 700 M-40A3 in .308. Built by very talented smiths. It shoots .5 to .75 MOA with BHM 175. I can match the performance with my handloads, but not improve it. I figure this rifle should be good for .25. My equipment is all top notch, as well as components. Lapua brass, varget, and vit. 140 powders, Federal GMM primers, 175 SMK bullets. I have played with seating debth and velocity to no end. Changed powder, but not primer. Case prepped to the max with the exception of neckturning, necks are super consistent. I have varied my bench manners, but still cannot hit my .25 MOA goal. I shoot at a range that has near purfect conditions in the AM and PM. Loads do well at the 1000YD line with the exception of a couple of missed wind shifts. My next course of action is to try 168 & 155 SMK and then try CCI Benchrest primers, but onlr changing one variable at a time of course. Any wisdom or insight would be great. Thank You in advance.
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Old 08-03-2002, 01:56 AM
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Re: Troubleshooting a .308 Win.

What size groups do you get at ranges further than 100 yards?

What scope and power are you using?
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  #3  
Old 08-03-2002, 02:31 AM
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Re: Troubleshooting a .308 Win.

Jason...

The 1/4", .308 rifle, while not truely rare, is NOT a common gun. Every builder of rifles swears that their guns are 1/4" shooters, but alass, one 1/4" group does not a 1/4" rifle make!

As "Doc" asked... you have said nothing about the scope, or set-up, etc. Also, you have not said anything about your shooting skills... do you have any other rifles that you can shoot 1/4" groups out of, opn a constant and regular basis?... which is to say "Are YOU a 1/4" shooter?

Not to disparage your shooting tallents, but.... most shooters think that if they have a 1/4" rifle, that they can shoot 1/4" groups. Unfortunatly, that is not the truth.

To shoot 1/4 groups with any regularity, it takes everything in the system... the rifle, the scope, the ammo, and the shooter's tallents, to be melded into one shooting machine... most shooters never get there.

CatShooter.
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  #4  
Old 08-03-2002, 07:11 AM
*WyoWhisper*
 
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Re: Troubleshooting a .308 Win.

I feel your pain. I too have a 308 that should and on occasion does shoot into one hole. I have seen it done with my rifle by another person. Therein is the solution ME!! I am the reason it doesn't shoot into one hole. A 1/4" group is harder to do than most think. That is shooting into the ".2s"
Off the top of my head I am thinking here are some of the reasons why your rifle isn't...

1. see above
2. What is your twist rate.
2a, your rifle may not stablize the 175's until further down range.
3. Trigger how light is it?
4. optics and parallax adjustment.
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  #5  
Old 08-03-2002, 09:11 AM
JPG JPG is offline
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Join Date: Mar 2002
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Re: Troubleshooting a .308 Win.

Dave King,
I have shot for groups at 100,200,& 300, seems to hover around MOA. I think my 3.5-10LR and the targets that I'm using could be part of it, further out.

Catshooter,
I agree with you, about shooting .25 all the time being tough. But the sun has to shine on a dogs ass someday! This rifle needs to throw me a bone! Tony Boyer I'm not, but I have shot in one BR match with a loaner rifle and set up. I shot a .189 at 100, and a .232 at 200, so this leads me to believe that I can shoot to some degree.

Wyowhisper,
My twist rate is 1-12, in a Hart Barrel.
I have thought to try 168 & 155 SMK to see what this does. I had bought a boat load of 175 SMK to shoot at 1000YD. I also broke down and bought a brick of CCI BR primers. About passed out when I got the bill! The trigger breaks at about 3.75lbs. The rifle is my pride and joy. I saved for a LOOONG time just for the deposite on it. It was built by Bruce at IBA. I love how durable and beefy it is. It looks nothing like the PSS that loads of people have at ranges all across the country. It's woodland cammo, so it is quite a conversation piece. The optic is a Leupold 3.5-10X LR with the side focus. I would love to put a NXS on but the grand it would take, I could use elsewhere right now.

Thanks Guys, any help would be great!
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  #6  
Old 08-03-2002, 10:06 AM
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Join Date: May 2001
Posts: 2,369
Re: Troubleshooting a .308 Win.

I've got the 3.5 x 10 M1 LR on all of my rifles and I noticed that I can't shoot as small groups as I could when I had a few 4.5 x 14 and 6.5 x 20s.

Let the rifle breakin a while and if you're up for some new setup, borrow or try out a 6.5 x 20 on the same rifle.

By IBA I take it to mean Iron Brigade Armory, a Chandler Rifle. It should certainly do whatever you want!!

My new George Gardner rifle (M40A1 sortof) is just starting to settle in after about 200 rounds, it's got a Mike Rock barrel.
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  #7  
Old 08-03-2002, 11:24 PM
*WyoWhisper*
 
Posts: n/a
Re: Troubleshooting a .308 Win.

OK first thoughts are this...

Try Fed 210 M primers
Varget 42 - 46 grns

I have a Nor-Cal Nighthawk. It took about 250 rounds to really shoot.. like consistient .2's. I have the 3.5 - 15 X 50 NXS on it..

It likes the 168's ALOT better than the 175's
I shoot .2's with the 168's and about .4's with 175's.. it also loves the J4 168 noslers!!! I shot a 15 shot .480 group with them.
But the 175's group better at 200 than 100. so I assume they are still pitching and yawing at 100.

Next it LIGHTEN THE TRIGGER!!!! mine is at 1 lb. exactly. It is tough to shoot .2's with a t 3-4 lb trigger...

Check your bag setup and make sure that your rear swivel stud is not touching the rear bag. I found out the hard way this can drive a man insane!!! Also make sure you return to the same front rest point, make sure everything is level etc. etc. I know that this seems trivial but always start simple...

Try this then do what Dave said.. try glass with a higher magnification.

If your shoooting factory ammo and getting anything around .5 your doing pretty good!!!!

Factory ammo even the match ammo is not very consistient to shoot groups like .2s

Hope this helps.....
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