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Accuracy help at 600

 
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  #15  
Old 08-27-2012, 12:32 AM
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Join Date: Dec 2011
Posts: 17
Re: Accuracy help at 600

I'm using a stock pack so regarding cheeck weld I assume the amount of pressure I rest my head with could make a difference, I would consider my trigger control pretty consistent I usuall take a sharpie and mark my finger after a few dry fire practices and practice release at end of exhale with lungs emptied. I have since done some ladder testing and showed a node liking 43.6-44.2 and then 44.5-44.8 @ 200 yds. I would like to hang around a low pressure load if possible an not push the 45.5 of varget anymore. I have some groups to shoot from the nodes I gathered and will keep u all posted, again thanks for the advice
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  #16  
Old 08-30-2012, 10:17 PM
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Join Date: Dec 2005
Posts: 2,114
Re: Accuracy help at 600

Quote:
Originally Posted by Wrcassell21 View Post
I am shooting a savage model 10 FCP in 308, 1:10 twist 24", 178 amax grouping 1/4" at 100 and like crap at 600 "well over ", I'm using 178 amax, 45.5 varget, and 2.815 oal, when max chamber is 2.825. love the speed (2720 ) but would like 1/2 moa better. think I'm shooting too fast ? any suggestions
I think your shooting too hot of a load. 45 to 46 grains of Varget is max for 155's in a .308 Win. case and that's a good load for Palma long range rifles.

With a much heavier bullet atop it, pressure's going to both much higher and get erratic. And while your bullets are leaving about 100 fps faster than normal loads with bullets of that weight at safe max pressures, they probably have a huge spread in muzzle velocity. A 100 fps spread in muzzle velocity for a .308 gives about 0.2 MOA vertical shot stringing at 100 yards. At 600 yards, it'll be 8 inches; 1.3 MOA. At 1000, 3.5 MOA or 35 inches. Erratic pressure curves also whip the barrel inconsistantly that may not be visible in the groups at 100 yards; just way down range a long ways away.

A better powder for bullets that heavy in a .308 case is IMR4064. About 43 grains has been used in competition with 180's that would shoot under 3 inches at 600 yards.
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  #17  
Old 08-31-2012, 08:40 AM
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Join Date: Dec 2011
Posts: 17
Re: Accuracy help at 600

I aree I backed it down and did a ladder test from 43 to 44.8 and def started to stray towards 44.8, I worked up a new load with 44.3 and shot 0.5" at 200, but when I adjusted to zero I shot 2 and they hit bullseye then other two were way off. beyond pulling. I mounted another scope and it performed as should . I'm sending scope to vortex for a look before I burn more powder and lead
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