Just to further the discussion, I shot a bunch o non-canister equivalent to Accurate #9 in a wildcat based on the 357 Mag case tapered to .319. It used lead bullets fired just subsonic from a custom single shot bench gun. My primers of preference were Federal SR Match. This combination shot cleanly and accurately in my rifle, but this discussion got me wondering about the relative strength of these primers vs the others under discussion.

Froggie