Tried the 300saum today.
Much better, with groups more than halving. Just need to fiddle with my hand loads now. Factory 165 grn grouped 1" & .7". Handloaded 165 with 70 grns 2213 1".
It certainly doesn't like 150 grn and 2208. 2-2.5" groups.
I can see copper again (after 15 shots) but accuracy seemed to hold ok.
Factory 3 shot groups. Fired bottom one and then up 4 clicks, and then fired the second group. Pics are on their side for some reason.
Hand load
So at least now I have something consistent to work on.
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