Rem700 PSS, 1/12, 26" bbl .308, OAL case length 2.80, once fired cases, primer pockets uniformed and flash holes deburred, case length 2.005-2.008, FC match cases - 1x fired.
Fed 210M (match) primers
Working up some loads for the .308. Hodgdon site shows 41.0-42.0 for a starting load. Using rcbs powder scale and dispenser.
At 42.0-42.9 70% of the cases fired have the primer backed out a tad. When I seated them the were seated slightly below the level of the case. Working load up in .3 grain increments.
The backing out stopped at about 43.2 grains through 46.0 grains, although the primers showed some flattening but no cratering as the powder charge increased.
Never had that happen before so am curious. Maybe over did the primer pocket cleaning, but used a Sinclair tool just for that purpose.
Groups tightened up around 43.2-43.8 very nicely. I may just reload the batch from 42.0 in different cases and try again.
Thanks for any input,
Wayne
Fed 210M (match) primers
Working up some loads for the .308. Hodgdon site shows 41.0-42.0 for a starting load. Using rcbs powder scale and dispenser.
At 42.0-42.9 70% of the cases fired have the primer backed out a tad. When I seated them the were seated slightly below the level of the case. Working load up in .3 grain increments.
The backing out stopped at about 43.2 grains through 46.0 grains, although the primers showed some flattening but no cratering as the powder charge increased.
Never had that happen before so am curious. Maybe over did the primer pocket cleaning, but used a Sinclair tool just for that purpose.
Groups tightened up around 43.2-43.8 very nicely. I may just reload the batch from 42.0 in different cases and try again.
Thanks for any input,
Wayne
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