Yes, the CCI #41 is the exact same primer as a CCI 450, except the anvil feet are slightly shortened to meet the military sensitivity spec. The TulAmmo KVB556M is also a magnum primer, though I don't know how it achieves the NATO sensitivity spec so as to distinguish it from the KVB223M which is their standard sensitivity small rifle magnum primer.
CCI reformulated their magnum primers in 1989 specifically to work well with WC844, WC846, and WC852, as used by our military in 5.56 NATO, 7.62 NATO, and .30-06, respectively, and sold in burn rate controlled canister grade by Hodgdon as H335, BL-(C)2, and H380, respectively.
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