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Some unusually slow-burning rifle propellants demonstrate less effective penetration depth, while unusually fast-burning rifle propellants demonstrate greater effective penetration depth. (Particularly fast-burning handgun and shotshell propellants show significantly greater effective penetration depth). This is exactly as would be predicted by anyone who understands how granules extract heat from the penetrating plume and how granules ignite: Compared to granules with a medium amount of deterrent in surface layers, granules that are more highly deterred require a longer bath in hotter gases to achieve ignition temperature, while less-deterred granules can ignite in response to a shorter bath in cooler gases. (Deterrent always increases ignition temperature proportionally, the higher the degree of deterrent, the higher the ignition

A: In order to move bullet this far, as necessary to cause significant rifling engravement, it is likely that a few propellant granules ignited. (While this might seem odd, it is quite possible for such interrupted ignition to occur.)
B: Swirl Charging involves pouring granules though funnel in a manner that promotes uniform propellant packing scheme and an unusually high bulk density – slowly pour granule stream from scale pan against side of funnel cone with snout of pan tangent to side of funnel.
1: Audible hangfire, perhaps 0.3-0.4 second delay; muzzle velocity may have been near 800 fps.
2: Audible hangfire, perhaps 0.3-0.4 second delay; muzzle velocity may have been near 700 fps.
3: Simulant material solidly welded and stuck in case – primer plume alone was proven in the All-Inert test incapable of creating such effective welding of simulant material; hence, partial ignition must have occurred.