John Linebaugh, the big-bore guru, says that the problem with the 625 (and S&W guns in general) is not so much a strength problem but a design problem. S&W designed the N-frame gun for 40,000 psi. But Linebaugh claims that, because of inherent design weaknesses, in effect, S&W put a 40,000 psi cylinder on a 30,000 psi frame. He considers 32,000 psi to be ABSOLUTE MAXIMUM for this gun and prefers to hold his personal loads to 5% under those listed loads for approximately 25,000 psi.