None of the above would work. The Order in Council reads: "capable of". Furthermore the Boys is a named prohib.
The RCMP have not pushed this as far as they can (yet). In one case, they deemed a 1908 Brazilian Mauser as a prohib because it was modified to fire a .460 Weatherby cartridge. Technically, this should make all the 1908 Brazilian Mausers prohibited since their actions are capable of handling a cartridge which produces over 10000 joules of energy.
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