Tact_Member

It is said that there is a wide variance on .40 S&W chamber size among manufacturers and that many are oversize compared to SAAMI specs. How much "oversize" is considered safe? Anyone's experience on this appreciated.

Thank You! Exactly what I need. SAAMI max on the chamber mouth is .4324 mine is .432/.4335 (not concentric) aprox .001 oversize at largest plain SAAMI max on .200 in from the mouth is .4314 mine is .432/.433 (not concentric) .0015 oversize at largest plain Anyone have any thoughts on this? I keep hearing many production pistols in .40 S&W are over SAAMI. should a chamber this large be considered safe?

I have a USPc that I think may have an oversized chamber. I have been told that the .40 S&W often is found with chambers well above SAAMI max. but not how much above is still safe. Can someone point me to a drawing or SAAMI specs for this caliber? Any info. appreciated.