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Further load development
Well, as some of you may remember, I'm working up a defensive load with Rainier 230gr.JHPs. The batch of loads I chrono'd today were using Unique powder and, based on how next weekends' waterjug testing goes, I may have a winner.
Weather Conditions; Skies-Clear Temp. 70 degrees Humidity at 30% All velocities taken ten feet from the muzzle All bullets were seated to 1.220" OAL with a .470 crimp 6.2 grains of Unique- 866fps ave velocity with a SD of 13. 6.3 grains of Unique- 887fps ave velocity with a SD of 20. 6.4 grains of Unique- 912fps ave velocity with a SD of 30. 6.5 grains of Unique- 875fps ave velocity with a SD of 16. The 6.5 grain load puzzles me. Never had velocity go down with an increase in charge-weight. No pressure signs at any charge-weight. Going to load another five rounds at 6.5 grains next weekend to see if it can be replicated. Water tests for the 6.3 and 6.4 grain loads next weekend also. The first two loads ran right at 2" on a 25 yard target, the 6.4 grain load ran 3". The 6.5 grain load ran about 2.5". All shooting was done two-handed from a rest.
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Diligentia, Vis, Celeritas COTEP#CBOB0428 NRA,GCA,OGCA, USAF,Msgt.(Ret.) |
#2
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As always, great write up
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CBOB0405 ︻┳═一 “When you get to the end of your rope, tie a knot and hold on. Help is on the way.” Author Unknown |