from a 44 Magnum, only those fired with typical midrange loadings (similar to above exampleever show any significant evidence of primer residues on bullet base and such bullets always show such residue. The same comparison holds for other cases of the same general length. Shorter cases do not follow this pattern for two reasons. First, obviously, propellant chamber gets shorter, so that it is more likely that plume will approach bullet base. Second, such cases generally use faster (more easily ignited) propellants, so that effective penetration depth naturally tends to increase.

Conversely, longer cases, despite potential use of hotter primers, tend to act similarly to the above W296, 44 Magnum example. In such longer cases, with any normal load, effective ignition depth never reaches bullet base. Use of smaller diameter cases, larger granules and some types of primers might increase effective ignition depth to perhaps approach 1-inch but it seems unlikely that it ever significantly exceeds 1-inch.