Want to experience some pain? Put some .357 rounds through the new Ruger LCR .357. Twice as bad as the SP 101. GP 100 is a dream to shoot compared to the other two.
The GP100 is a tank especially in the 6” barreled version which I have and can handle the most powerful .357 loads out there with much lower blast effects. The LCR is simply too light as other light alloy revolvers are as they cannot dissipate the blast effects. I find the SP101 to be a pleasant shoot for a compact .357. The Corbon 110 grain Magnum is perfect for this gun. If you want to experience a new level of blast effect try the Ruger Super Redhawk chambered in either .454 Casull or .480 Ruger which are real cannons.