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.375 WINCHESTER

Spring1A

Private
Minuteman
Dec 23, 2020
47
41
MINNESOTA
Anyone here load for it? Not much published data available for 200gn sierra flat points, other than 4198 or RL7 pushing 220gn bullets. Of course I cant find either of these powders at local gun shops. I do have plenty of the popular 30 cal powders, varget, imr 4895 and 4064. Just not sure where starting charges would be.