09-06-2020, 07:33 PM
A few observations that may apply. Case capacity was decreased a grain and 1/2 or so with my converted cases but velocity gains from the large rifle primer made up for that, sometimes exceeded.
Before going to large scale conversion, note that in the early Grendel days when brass was scares some converted 7.62x39 brass to make Grendel cases. Many experienced loose primer pockets in 3 to 4 reloads. I'm not sure how hot they were pushing them for that to happen and it may be dependent on what brand of 7.62x39 brass they choose to start with.
I am also going back to large primers as I stocked up on them on the last shortage (Fed 210M's were gone for years).
Before going to large scale conversion, note that in the early Grendel days when brass was scares some converted 7.62x39 brass to make Grendel cases. Many experienced loose primer pockets in 3 to 4 reloads. I'm not sure how hot they were pushing them for that to happen and it may be dependent on what brand of 7.62x39 brass they choose to start with.
I am also going back to large primers as I stocked up on them on the last shortage (Fed 210M's were gone for years).