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7mm accuracy problems

 
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  #1  
Old 09-06-2013, 01:54 AM
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Join Date: May 2013
Posts: 16
7mm accuracy problems

Kind of a multi part question. I have a custom 7 rem mag based on a weatherby action. It has a McMillan sporter stock and a hart #5 barrel. It was designed to be a longrange hunter. It also sports a vx3 long range 30 mm scope. Everything is cool as far as bedding and barrel floating as far as I can tell. My problem is that I can't seem to get it to shoot as accurately as I'd like. My gunsmith originally worked up a load using nosler brass, 160 gr accubonds, reloader 22 and 210m primers. It shoots that recipe pretty well but I seemed to notice velocity spreads which I kind of equate to the reloader 22 and the 210m primers. I have also tried to get itto shoot the new 168 berger classic hunter over a number of powders using primarily 215m primers. I should have also mentioned the twist rate is 1:9 as far as I remember. The bergers just haven't seemed to wanna shoot. My question is, even though I'm not seeing anything that might lead me to believe that the bullets are not stabilizing, is there a possibility that those bullets are not stabilizing properly afterall? The brass has been loaded somewhere around 5 times. I'm not seeing any reason to think the brass has gone south and I'm pretty anal about brass prep. Have you guys seen brass that has been loaded a handful of times affect accuracy even though it has been prepped well? Sorry for the rookie questions but I'm about at my wits end, considering the time and effort that has been put into this gun. Any ideas or bullet suggestions would be appreciated. I have even considered trying lighter bullets and giving up the ballistic coefficient but that would seem to be contradictory to the long range purpose.
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  #2  
Old 09-06-2013, 06:53 AM
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Join Date: Apr 2012
Location: Terre Haute In.
Posts: 696
Re: 7mm accuracy problems

First let me state this is JMO.
1. I'm guessing your brass could use some anneling, then trim all to length, camfer inside and out.
2. Make sure everything on the scope is properly torqued.

3. Your rifle should stabilize both the 168's and the 180's, my 7RM shoots the 168's very well. That said I had it specifically built for that bullet it is a 1-10
You might try H1000 I started with R22 after talking with Bryan Litz he suggested H1000 and I've never looked back. Try some different primers, 215m, CCI250, which is what I use I started with the 215's but was always getting one flyer on a suggestion from this sight I tried the 250's problem solved.

4. The bergers like to be seated close to the lands, mine are .001 off, experiment with different seating depths. From a jam out in .010 on out till you find something that is getting close to what you want then tweek from there in.001 increments.
These are the things that worked for me all info gathered here,I am not the most knowledgeable guy on this sight by any means, and still rely on this site and the shooters here for help now and again.
Shot this group last Saturday.7mm accuracy problems-get-attachment.jpg Normally my groups measure around .25 I was just having a very good day. Good luck let us know what you come up with. And yes that is 3 shots, I had a witness who is a member on this forum.
Rick
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  #3  
Old 09-06-2013, 09:43 AM
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Join Date: May 2013
Posts: 16
Re: 7mm accuracy problems

Wow, I've never seen a group like that! Thanks for the suggestions. I've been wanting to try h1000 but have not been able to find it. At this point I'm really leaning towards a different primer and powder combination and seat em closer. So far I haven't seated em closer than .020" since they're the berger classic hunter and are supposed to be much less sensitive to seating depth. I was tempted to try the 140s just to give em a try but really don't want to drop In bc that far.
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  #4  
Old 09-06-2013, 04:08 PM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 5,953
Re: 7mm accuracy problems

Bergers do generally like to be seated closer to the lands but not in every rifle.

At the top of the reloading Forum you will find a sticky that Berger provided to assist in getting the best accuracy out of your Bergers. Check it out.
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  #5  
Old 09-06-2013, 04:34 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,831
Re: 7mm accuracy problems

Maybe I missed it but what size groups are you getting out of your rifle?

How did the rifle shoot before it was rebarreled and restocked?

I have seen on several occasions where a Wby receiver was the main issue, if it was the MkV receiver that is. Not saying that's the problem but in my experience, there are enough MkV receivers out there that simply will not respond to anything you do if your looking for sub moa grouping. I know I will piss off a lot of Wby lovers out there but this is not opinion, about 10% are not worth the time to do anything with if you want a rifle that shoots less then 1 moa.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #6  
Old 09-06-2013, 04:35 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
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Re: 7mm accuracy problems

Quote:
Originally Posted by rick523 View Post
First let me state this is JMO.
1. I'm guessing your brass could use some anneling, then trim all to length, camfer inside and out.
2. Make sure everything on the scope is properly torqued.

3. Your rifle should stabilize both the 168's and the 180's, my 7RM shoots the 168's very well. That said I had it specifically built for that bullet it is a 1-10
You might try H1000 I started with R22 after talking with Bryan Litz he suggested H1000 and I've never looked back. Try some different primers, 215m, CCI250, which is what I use I started with the 215's but was always getting one flyer on a suggestion from this sight I tried the 250's problem solved.

4. The bergers like to be seated close to the lands, mine are .001 off, experiment with different seating depths. From a jam out in .010 on out till you find something that is getting close to what you want then tweek from there in.001 increments.
These are the things that worked for me all info gathered here,I am not the most knowledgeable guy on this sight by any means, and still rely on this site and the shooters here for help now and again.
Shot this group last Saturday.Attachment 25129 Normally my groups measure around .25 I was just having a very good day. Good luck let us know what you come up with. And yes that is 3 shots, I had a witness who is a member on this forum.
Rick
Looks like your first shot made it to the target and the other two came apart in flight!!! Just kidding, once in a lifetime group!!
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #7  
Old 09-06-2013, 04:48 PM
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Join Date: Apr 2012
Location: Terre Haute In.
Posts: 696
Re: 7mm accuracy problems

Quote:
Originally Posted by Fiftydriver View Post
Looks like your first shot made it to the target and the other two came apart in flight!!! Just kidding, once in a lifetime group!!
Thanks,Kirby yeah after the second shot my buddy said damn you missed the whole back stop (4'x4') after the third shot I thought so myself Like I said I was having a good day the pic I wish I took was a 3 shot group on an 8" steel plate at 905yds. it measured just hair over 1.5" but like the dummy I am I let my buddy go ahead and shoot that opened the 6 shots up to about 5". Still not bad for 2 different shooters and two different rifles.
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