Big-bore-bob
Member
Hello all,
Had a testing session this weekend with several loads for my .44 mag and .357 magnum smith's. For the .357 686+, 4 inch barrel, using 158gr xtp hp's and fp's over 15.5gr h110, cci 550, coal 1.575, starline brass, I recorded a large difference in SD and ES between the two bullet types. Xtp hp: SD 11, ES 38, avg vel 1245, hi of 1259, lo of 1221. Xtp fp: SD 28, ES 88, avg vel 1224, hi of 1265, lo of 1177. In my hornady manual both bullets are listed under the same load data. When I measured the base of the bullets to the bottom of the cannelure the FP is shorter than the HP ( less bullet in the case for the FP). Do to local availability I've been buying both style of bullets. My question is: what would cause the difference in performance between the two bullets? ( larger case volume with the FP) Would increasing powder charge with the FP possibly stabilize the h110 powder burn? I belive 15.8 is the max load per hornady. Anyone see these sort of results before? .357 is my newest cartridge I'm reloading/ handloading for. Thanks!
Had a testing session this weekend with several loads for my .44 mag and .357 magnum smith's. For the .357 686+, 4 inch barrel, using 158gr xtp hp's and fp's over 15.5gr h110, cci 550, coal 1.575, starline brass, I recorded a large difference in SD and ES between the two bullet types. Xtp hp: SD 11, ES 38, avg vel 1245, hi of 1259, lo of 1221. Xtp fp: SD 28, ES 88, avg vel 1224, hi of 1265, lo of 1177. In my hornady manual both bullets are listed under the same load data. When I measured the base of the bullets to the bottom of the cannelure the FP is shorter than the HP ( less bullet in the case for the FP). Do to local availability I've been buying both style of bullets. My question is: what would cause the difference in performance between the two bullets? ( larger case volume with the FP) Would increasing powder charge with the FP possibly stabilize the h110 powder burn? I belive 15.8 is the max load per hornady. Anyone see these sort of results before? .357 is my newest cartridge I'm reloading/ handloading for. Thanks!