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You have chrony data to back up that it is the primer size?You will have slower fps, maybe less than 50fps,
depending on your recipe. Yet still slower.
You are correct that all the published data out there is for "standard" LP brass. Doesn't mean that you can't work up a load using that data with SP brass though..45acp with large primers are much better performers
and all data commonly used to re-load them are for
components using them.
The manufacturers are saying that it's non-reloadable because when the NT ammo was introduced, the NT primers weren't commonly available to reloaders.what's NR about it? non standard flash hole or anvil? case material 1-use thin like the cci stuff ( aluminum ).. etc.?
I've been putting all the SP brass i have in a plastic bin, hoping one day I'll have enough and find someone who wants to trade for LP.