Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

Accuracy Question

 
LinkBack Thread Tools Display Modes
  #1  
Old 01-09-2011, 07:35 PM
Bronze Member
 
Join Date: Dec 2010
Posts: 61
Accuracy Question

I am hoping you guys can help me with this. I shot a 4 shot 1" group today out of my 7RM with 62 grains of IMR4831 pushing a Berger VLD 168gr. bullet. So I pushed it out to 500 yards and shot very erradic like about 12" group.
Theoretically, if a gun shoots MOA at 100 shouldn't you expect that (barring shooter's error) that gunn with the same load would shot 1 MOA at all distances? Or can a bullet loose it's accuracy as the distance increases?
Also, with this same set up I had shot a 5.5" group at 700 yards right after I first bought this gun used. Someone told me I should clean it good, so I used Birchwood Casey's Foaming Bore Scrubber. I haven't been able to get it to shoot tight groups since. Before I was shooting 1/2" groups at 100 yards.
Any suggestions? Should I just chalk it up to shooter's error and keep practicing (I was using a bench rest), or should I try to modify something in my load, bullet selection, COAL?
Reply With Quote
  #2  
Old 01-09-2011, 10:54 PM
Platinum Member
 
Join Date: Dec 2008
Location: Northern Id.
Posts: 3,314
Re: Accuracy Question

Quote:
Originally Posted by j_unzicker View Post
I am hoping you guys can help me with this. I shot a 4 shot 1" group today out of my 7RM with 62 grains of IMR4831 pushing a Berger VLD 168gr. bullet. So I pushed it out to 500 yards and shot very erradic like about 12" group.
Theoretically, if a gun shoots MOA at 100 shouldn't you expect that (barring shooter's error) that gunn with the same load would shot 1 MOA at all distances? Or can a bullet loose it's accuracy as the distance increases?
Also, with this same set up I had shot a 5.5" group at 700 yards right after I first bought this gun used. Someone told me I should clean it good, so I used Birchwood Casey's Foaming Bore Scrubber. I haven't been able to get it to shoot tight groups since. Before I was shooting 1/2" groups at 100 yards.
Any suggestions? Should I just chalk it up to shooter's error and keep practicing (I was using a bench rest), or should I try to modify something in my load, bullet selection, COAL?
There are a whole lot of variables mentioned here! The 1" moa to approx. 2 1/2" moa at 500 was probably shooter error (quite possibly wind). As far as loosing accuracy after cleaning goes, if that really is the case, it wouldn't be unusual. This is especially true if the rifle was on its down hill run accuracy wise. Sometimes a dirty shot out barrel will group a lot better than a clean one. How many rounds have been fired through it? Another possibility is damage from the cleaning process itself, especially if it involved the muzzle (crown) I'm not saying you did that, but it happens....Hope you get it figured out....Rich
Reply With Quote
  #3  
Old 01-09-2011, 11:39 PM
Bronze Member
 
Join Date: Dec 2010
Posts: 61
Re: Accuracy Question

Thanks, Rich. I am concerned that I may have damaged the rifle during my cleaning process. I don't know hold old the rifle is, but it is in very good condition as far as how it looks both outside and also inside the barrel. How does someone damage their crown? what things can go wrong in the cleaning process?
My cleaning process involved using the bore scrubber and letting it sit for an hour and then scrubbing with a wire brush. and then using a patch until the patches came out clean.
Also, when I shot at 500 yards there was a slight wind, about five mph, but it was nearly head on.
Reply With Quote
  #4  
Old 01-10-2011, 12:34 AM
Platinum Member
 
Join Date: Nov 2005
Location: Riggins Idaho
Posts: 1,119
Re: Accuracy Question

Did you check to see if youre bullets are "key holeing"? If so youre twist isnt fast enough for those bullets. I would be surprised if they werent stabilizing but just checking.
__________________
I dont know who ever came up with the imaganary word of "Over Gunned"
Reply With Quote
  #5  
Old 01-10-2011, 07:59 AM
Bronze Member
 
Join Date: Dec 2010
Posts: 61
Re: Accuracy Question

I did notice that occasionally some of my hole tears in the paper were not perfectly round. Is that what you mean by keyholing? I shoot a factory Rem 700, but don't know exactly what the twist rate is.
Reply With Quote
  #6  
Old 01-10-2011, 08:55 AM
Gold Member
 
Join Date: Jan 2010
Location: NC mountains
Posts: 508
Re: Accuracy Question

Quote:
Originally Posted by j_unzicker View Post
I did notice that occasionally some of my hole tears in the paper were not perfectly round. Is that what you mean by keyholing? I shoot a factory Rem 700, but don't know exactly what the twist rate is.
I really don't think that twist rate would be a problem for 168g. Now, if you were shooting 180g, then I would say that you might be a little slow (twist wise) from a factory tube. When I ordered my McGowan barrel I was asked what weight bullet I was going to be shooting through my 7MMRM and I told them 168-180s and they said a 1:9 twist would be fine. Having said all that, I don't know what gun you have, but I am pretty sure that you wouldn't have a twist problem stabilizing 168s.
Reply With Quote
  #7  
Old 01-10-2011, 08:56 AM
Gold Member
 
Join Date: Jan 2010
Location: NC mountains
Posts: 508
Re: Accuracy Question

Quote:
Originally Posted by j_unzicker View Post
I did notice that occasionally some of my hole tears in the paper were not perfectly round. Is that what you mean by keyholing? I shoot a factory Rem 700, but don't know exactly what the twist rate is.
I really don't think that twist rate would be a problem for 168g. Now, if you were shooting 180g, then I would say that you might be a little slow (twist wise) from a factory tube.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Accuracy Question
Thread Thread Starter Forum Replies Last Post
Balistic Software accuracy question earl1704 Rifles, Bullets, Barrels and Ballistics 4 10-22-2009 07:15 AM
M14 / M1A accuracy Skinny Shooter General Discussion 13 10-01-2009 07:28 PM
AR-10 Accuracy Question Jeff In TX Rifles, Bullets, Barrels and Ballistics 1 10-30-2007 11:36 AM
accuracy at 700/800 with 1.5 moa at 300??????????? 30-06 boy Rifles, Bullets, Barrels and Ballistics 1 10-27-2006 02:51 PM
Question about extended range accuracy bgordon Long Range Hunting & Shooting 2 04-06-2002 12:54 AM

Current Poll
Do you plan to buy a new custom rifle in the next 12 months?
YES - Of course - 72.96%
1,651 Vote
NO - wife/girlfriend won't let me. - 27.04%
612 Votes
Total Votes: 2,263
You may not vote on this poll.

All times are GMT -5. The time now is 04:08 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC