I checked it first with 57gn's 4831 pushing along a 130SST, chrony averaged 2848fps. My records show that load was doing 2924fps in another rifle. The same records also tell me that at some point I had a load using Superformance and a 130SGK, and that went 3159fps! Both the 4831 load and the Superformance load were shot about 15 minutes apart, to let the barrel cool down.
My son and I have identical 308 Husky's, his will put 4 different loads in the same 25mm group at 100. We both use the same reloads for hunting, and his is 70fps faster than mine. Same rifle, same barrel length etc.
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