"The .327 Federal Magnum provides performance similar to the high-velocity rifle
loadings of the old .32-20 Winchester
, though these velocities are achieved in a much shorter revolver barrel, thanks to a much higher pressure ceiling for the .327.
Another similar cartridge is the .30 Carbine
, which has been offered in Ruger's single-action
Blackhawk revolver line since 1968.
However, the .327 Federal Magnum has a higher maximum pressure ceiling (45,000 psi) than the .30 Carbine (40,000 psi).
Custom gunsmiths working with Ruger and Freedom Arms
have offered conversions of single-action .32 H&R Single Six and Freedom Arms
revolvers to .327 Federal. Test results from the long barreled guns showed even higher velocities than the .30 Carbine, along with excellent accuracy."