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bk40 · March 7, 2000, 04:21 PM

Mal,

I've been able to reduce group size at 50yds (segregating by thickness) by as much as 0.15". In BR rifles and pistols the reduction is usually smaller than in production guns such as a fine Kimber of Oregon rifle.

The best use I've found for rimfire thickness gages is the ability to take standard velocity ammo from Winchester, Remington... and obtain match ammo like accuracy with the cheaper stuff. Groups with std rimfire ammo can be reduced by as much as 0.3" at 50yds using this method.

With top quality match ammo, (Eley, Federal Match, Lapua...) lot to lot variations will normally have the greatest effect on accuracy, I've found. To eek out the tiniest bit of accuracy its usually necessary to segregate by rim thickness and weight, but we're talking less than 0.1" difference in match chambers with match ammo 50yds.

March 7, 2000, 04:21 PM	#5
bk40 Senior Member Join Date: January 12, 1999 Location: Mississippi Posts: 1,004	Mal, I've been able to reduce group size at 50yds (segregating by thickness) by as much as 0.15". In BR rifles and pistols the reduction is usually smaller than in production guns such as a fine Kimber of Oregon rifle. The best use I've found for rimfire thickness gages is the ability to take standard velocity ammo from Winchester, Remington... and obtain match ammo like accuracy with the cheaper stuff. Groups with std rimfire ammo can be reduced by as much as 0.3" at 50yds using this method. With top quality match ammo, (Eley, Federal Match, Lapua...) lot to lot variations will normally have the greatest effect on accuracy, I've found. To eek out the tiniest bit of accuracy its usually necessary to segregate by rim thickness and weight, but we're talking less than 0.1" difference in match chambers with match ammo 50yds.