Quote:
Originally Posted by 336A
Just got back from testing my W231 loads with the M10. I fired 100 rounds of 4.5gr W231 under a TVB 158gr SWC. For comparison I brought along 100 rounds of my old standby load of 4.6gr Unique and the same bullet. All shooting was conducted standing and in SA slow fire at 10 yards. While the W231 load was accurate I found the Unique load to be more so. The recoil impulse was snappier with W231 for some reason too. The recoil impulse of the Unique loads resembled more of a pleasant push.
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It's possible the recoil is snappy on the W231 round because of the charge weight you're using. According to Hodgdon the Max charge weight is only 3.7gr W231 under a 158gr LSWC bullet. Of course that's too low according to the older data but even the older Winchester data stopped at 4.4gr W231. Your charge is clearly in the +P range while the Unique load isn't. (Alliant's data lists a max of 4.7gr Unique under a 158gr LSWC bullet)