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Help!! Horizontal groups....

 
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  #8  
Old 05-10-2012, 11:25 AM
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Location: Michigan
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Re: Help!! Horizontal groups....

After a trip to the range this morning I think there may be some hope yet. It appears that the slower burning powders are a big part of the problem. Both 4350 and 4831 continued to have groups under 3/4" tall and 2" or more wide. RL 19 & 22 both looked much better - right at 3/4". I will keep after this and report back!
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  #9  
Old 05-10-2012, 05:38 PM
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Re: Help!! Horizontal groups....

Have you tried the ocw method?
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  #10  
Old 05-11-2012, 01:53 PM
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Re: Help!! Horizontal groups....

Ok, so here it is. It's all about speed. I dropped back on my charge with RL19, not because of pressure but to slow her down a bit and I upped the charge of 4831. I went down a grain at a time with th RL19 and up 1/2 with 4831. After the 3rd go around of this up and down it was becoming quite obvious. I've been watching for the bad stuff in regards to pressure but the faster I go the tighter the groups get and the slower I go the more they spread out horizontally. I shall continue along this path until my rifle says stop. Current groups at a 100 yards are right at 3/4 give or take a touch with the 4831 and I'm a happy camper........
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  #11  
Old 05-11-2012, 03:40 PM
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Re: Help!! Horizontal groups....

IMR 4831 or H4831?? H4831 is also available as H4831sc which will flow through your powder measure better with less deviation in charge weight. I use the SC version in my 6.5/06. I still weigh every charge but I can drop 98% and trickle the rest with reliable results. YMMV
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  #12  
Old 05-11-2012, 04:51 PM
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Re: Help!! Horizontal groups....

In my 20 yrs. playing with various factory and custom 25/06's I've found 4831 as fast as the rifle will let you push it has ALWAYS been good medicine. Always pushing 115/117/120gr. pills. I've tried a ton of powders and bullets and I just keep coming back to H4831SC in the 53gr. range with 115gr. nosler BT, 115gr Berger VLD, 117gr. Hornady SST. My current incarnation in 25/06 is a Browning Stainless Stalker with BOSS and it'll shoot 1/2-5/8MOA out to 400yds(furthest I've taken it to) all day long with 53.3gr. H4831SC lit by a Federal GM210M pushing either the VLD or BT at .070 off the lands in Remington/Hornady brass. You definitely need to get them cooking out of that thing then just sit back and smile!
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  #13  
Old 05-11-2012, 05:59 PM
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Re: Help!! Horizontal groups....

Got it! Thanks, I'll keep that in mind as I continue to work my up.
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  #14  
Old 05-11-2012, 07:51 PM
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Re: Help!! Horizontal groups....

My M77 in 7 rem mag had same prob. Alittle time and a dowell rod with sand paper floated the barrel. Now it shoots 1'' groups at 200 yds. Factory tube for now.
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