The Lone Haranguer
Member
In a double-action revolver I would say the Ruger GP-100. It is not the size or strength of the frame that matters, but the support to the cylinder at the moment of firing. Rugers lock the cylinder at the front of the crane, the ratchet/hand and the cylinder stop/bolt. Smith & Wessons and especially Colts do not. Even stronger, however, is the Blackhawk, a single-action revolver. The cylinder is in a solid frame with no cutout for the yoke/crane, and supported by a solid pin over a quarter inch in diameter that runs the entire length of the cylinder.