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Old May 8, 2012, 10:57 PM   #4
mehavey
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Join Date: June 17, 2010
Location: Virginia
Posts: 6,869
NOTE: OverMax Loads mentioned here. Caveat shooter

Quote:
185gr bullets with 14-15grs of Lil'Gun seems high to me for a lead bullet that heavy,...
I'll never venture that you might not be right in that respect, though the CastBoolit troops are running at high as Lil'Gun/16gr under that bullet, and I'm running matching velocities w/ their 15gr loads. In any case I have already loaded down to 13.0-13.5gr for trial as soon as it quits drizzling around here. Group trends indicated slower might be better anyway.

Before I ever started I had also calibrated QuickLoad against Lyman's velocity/pressure listing for V-N110 under their #358429 170grain LSWC by adjusting case volume to match what their test setup gave them. Then I shifted those same settings over to Beartooth's 185gr design, Lil'Gun powder, lengthened the OAL by 25-thou, and stretched the barrel to 20". Believe it or not the pressure went down due to OAL more than it went up due to bullet weight. and the velocities I chrono'd @1,730-ish matched QuickLoad's predictions absolutely dead on -- but I'm approaching top end European pressures at 15.0gr.

13.0gr should see me back down to 25,000psi/1,510fps; and 13.5 should produce 27,400 at 1,570fps.
I can certainly live w/ that if groups settle some more



Meanwhile, I haven't a clue how the CastBoolit guys are getting away with 16.0grains+/

Last edited by mehavey; May 8, 2012 at 11:11 PM.
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