Discussion in 'Reloading Forum (All Calibers)' started by Erik Cortina, May 5, 2013.
Decent from 40.5-41.5. Might look at 0.1 gr increments across the middle 2/3
I did a load test yesterday on Sierra 142's with H4831SC in a .260 Remington with a new 100 round count 30 inch Shilen 1 in 8 twist barrel. Due to a chrono error at 43.3 and 43.6 I have no data. but the following velocities were recorded
43.9 gn 2749 FPS SD 49
44.1 gn 2762 FPS SD 35
44.4 gn 2769 FPS SD 7
44.7 gn 2804 FPS SD 18
45.0 gn 2816 FPS SD 11
45.3 gn 2818 FPS SD 32
seating was at 2.250 base to ogive and .025 off lands.
I will only have one chance to do a seating depth test before a 800 yard match should I test depth test @ 44.4 which had the lowest SD or 45.0 which had a slightly higher SD but the test groups between 44.7 and 45.3 only had a 14 FPS differential. The alternative would be leaving the depth at 2.250 and doing a velocity test using 44.3 - 44.4 - 44.5 and a velocity test using 44.9 - 45.0 - 45.1
Targets were shot in the afternoon at 88F and a heavy boiling mirage with 0 - 3 mph winds. Not my ideal testing environment but I had to work with what I had after a solid week of rain
thanks in advance for any replies
left side on target 2 was cut off on the scanner, top is 44.4 and bottom is 45.0
Shot this Today.. which ones would you choose? No chrony today just load and seating depths
33.2 gr / -.04
33.2 @ .011, the jammed group shot a little high, the next three you can stack on top of each other, take the one in the middle!
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