John Y Cannuck said:Check your reloading manuals for pistol data on cartridges for the contender, and compare with the same cartridge with rifle data.
That should give you a good idea what kind of losses to expect with barrel length changes for different cartridges.
Note also, that for the most part, the same powders that work well at rifle lengths, work at pistol length.
Good idea...Even in his infirm old age, Johnny shows he still can still formulate brain waves from time to time.