Mr. Sisk, re:your question on .3080 vs. .3085 bores
In my .30 cal. BR guns, I haven't seen any real velocity loss as we've reduced the barrel length. The .30 cal. Liljas I use usually run right at .2998-.3000 and are three groove with both 1:15 and 1:17 twists using a leade angle of 1.5 degrees. The case is based on the 308 Lapua and is shortened to hold an average of 48.0 gr. of water.
I believe the throat angle, freebore, number of grooves, and neck tension have as much to do with a barrels velocity as anything..within reason of course.
My gunsmith just finished a 250 Savage Ackley Improved for me. From a 22" barrel, the 75 VMaxes will go 3680 and the 87 gr. Sierra flat based bullet 3400. A short throat, snug bore (especially on a .25, as most bullets measure around .2565-.2568 for the .257 bore) and an efficient case sure does wonders for velocities.
Neat experiment..thanks for the info. -Al.
Last edited by Al_Nyhus; 01/01/03.
