Some throat dimensions from guns I have owned over the years. Down to 3 now, the 31-1, K32, and 32 M&P.


SP101 327 Magnum .3125

S&W pre-war 32 Long M&P .3125

S&W K32 32 H&R conversion .3135

S&W 31-1 .314

S&W 631 .314

S&W 16-4 .314

Uberti Stallion .314

Bisley 32 H&R .3145 (New out of the box 2 throats were .314 and the other 4 were just over .313. -- .3145 was the final dimension of all 6 throats after having them honed to a uniform size.)

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S&WCA #1955, S&WHF #818