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338 Edge

 
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  #1  
Old 03-25-2007, 07:16 PM
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338 Edge

I had a 338 Edge built a while back and finally got out to sight her in today. The load that I used is 88.5 gr. H1000 behind the 300 gr Sierra hpbt match as I am fire forming the brass. I fired a couple of shots at the target from about 40 yards and thought the holes looked a little wierd so I walked up to check them out. The bullets had hit the target pretty much sideways or flat (keyhole). Has anyone else had this happen to them? My gun has a 26 inch barrell, with a 1-10 twist. I know that I am about 50 thosand off the lands,but would that cause this problem? Does anyone have any suggestions.
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Old 03-25-2007, 07:20 PM
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Re: 338 Edge

I guess I will just keep my nose out of this one [img]/ubbthreads/images/graemlins/blush.gif[/img]
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Old 03-25-2007, 07:31 PM
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Re: 338 Edge

I would check the twist rate to make sure it is a 1-10. You should be in the 2600 fps range and I have had no problems stablizing the 300 SMK at these speeds. I assume you have checke all the usual suspects, muzzlebrake alinement, square crown etc?
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Old 03-25-2007, 07:41 PM
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Re: 338 Edge

for starters, you don't have to fireform brass for the edge.just push the necks out, load and shoot.

everything seems to be about right that you're doing. if i would venture a guess i would say go with more powder, not less. 88 grains might be too little and ignition might be suffering,making for very slow speeds. i shot 92 gr of H1000 last year with the 300 pills and 95 was still not too much. try 91 grs and use a crono. you should be at least 2600 and a 10 twist should stabilize that 300 just fine. let us know how you make out.
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Old 03-25-2007, 08:19 PM
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Re: 338 Edge

I checked and it is a 1-10 twist. It does not have a brake on it. Shawn does more powder sound like it could help. Dave I am a little nervous about shooting through my chrono. as the way they are coming out I could end up with a hole through something. Dave what does your gun have for a barrell length,mine is 26. Fireforming might be the wrong term, just the first time the brass has been shot after being necked out.
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Old 03-26-2007, 07:45 AM
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Re: 338 Edge

I have run from 92-95 grains of H1000 as a final load depending on OAL and freebore lengths. Watch carefully for preasure signs and start working up. The Edge w/ the 300 SMK & H1000 seems to be one of those rounds that shoots better the faster you push it right up to max preasure. I have had several shoot their best groups with the bolt getting slightly sticky (unfortunatly this is not acceptable to me). I don't believe that velocity is the issue (it could be) I have down loaded the Edge to 1800 fps to test bullets at impact velocities and had no keyhole issues. Let us know how it goes.
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Old 03-26-2007, 07:58 AM
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Re: 338 Edge

I would have to agree with Shawn in that if your barrel is a 1-10 twist you should never see a problem with stability at any of the velocity range you should be using the Edge at.

Couple questions. I assume this is a match grade barrel that was new when the rifle was built??? Or was it a factory barrel rechambered to the Edge??

What I am getting at is if it was used, make sure the bore is completely free of copper and carbon fouling.

A good build up of either ahead of the throat can cause what you are seeing but I would say this is unlikely.

I also feel this is a mechanical issue. How did you measure your twist rate in your barrel. If I had to guess just reading the behavior of your rifle, I would say you have a 1-12 twist assuming everything else is set up properly.

Just curious how you measured your twist rate.

Like Shawn mentioned, check out the usual suspects, crown, brake and such.

If all checks out, I would seat those bullets to within 10 thou of the lands or even touching and drop back to 85 grains and work up from there.

One other reason for this may be that you have a loose bore. What brand of barrel is it if it is a custom pipe. I have seen exactly what Shawn has discribed many times with barrels with larger then nominal bores. They really start to shoot good at very upper end loads. The reason, in my opinion is that they need a serious kick in the rear to bump the bullet base up to fill the bore properly and this results in better consistancy and accuracy.

A bullet such as the 300 gr SMK has a relatively stout jacket and needs a good slap in the rear with high pressure to bump it up in a looser bore diameter.

This would be fairly uncommon with the top end match barrels but could happen.

If the upper end loads do not solve your problem, Just to prove the theory, get some 250 gr SMKs and see how they shoot. If they stay on point and the 300 gr SMK will not, I would almost bet you have a barrel that is not exactly 1-10.

BAscially test one thing at a time to eliminate it as a reason for the problem. That way you will be able to see exactly what effect each has on the rifles performance.

Keep us posted.

Kirby Allen(50)
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