bratch,I've about eliminated the J-frame due to recoil and not handling the stouter loads as well.
As long as you stay away from light bullets at full house magnum velocities the K frame's forcing cone will be just fine.A "K" frame S&W will never hold up to a steady diet of 357 mag loads and on the other hand, you will never wear out the GP100...
A "K" frame S&W will never hold up to a steady diet of 357 mag loads and on the other hand, you will never wear out the GP100...