Cci Primer Recommended Seating Depth

I suspect primers are not seated all the way. The rounds were once fired CCI brass, fresh Win. Primers, 124 gr. RN, on a mid range load of Blue Dot. I use a Lee hand primer and it was going as far as it can in seating the primers. I have used the same primer on many other calibers with out problems but these were the first 9 mm I have loaded. Primers I have used cci 500 primers exclusively for my 9mm reloads, about 15,000 of them and have been generally happy with them, until today. During a range visit, I brought 200 rounds, and during the last 50, had 6 click, no bang. All appeared to be light strikes. I was running my p365.

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Cci Primer Recommended Seating Depth

Alex Wheeler

Well-Known Member

Cci Primer Seating Depth

I have been playing with the Primal Rights CPS primer seating tool. Conditions where not ideal this morning but I wanted to run the test at 1k. Even though the conditions where not very good, in my opinion the results certainly tell me primer seating depth does matter. I shot this with my 6BRA with a BR4 primer. Group size was effected as well as point of impact. Each .002' increment was worth about 1.5-2' in poi. I measured the pocket depth and the primer height to determine the 'crush'. .004' and .006' overlapped and held 2.7' of vertical for all 6 shots. We will continue to work on this and will share more as we learn it.