What a surprise....................

[hiram]

I finally said to myself---'ya know, you should slug the barrels'.

So I slugged my S&W m&p and the groove was .451--.452.

My Sig P938 was .454--.455.

More labeling bullet containers for each firearm.

[odfairfaxsub]

I thought the p938 was a 9mm. If that's the case you might be tired

[hiram]

Sorry--- had a brain fart.

The S&W M&P (9mm) slugged to .351-.352.

The Sig P938 slugged to .354-.355.

[leeggen]

not to question your results but I have a sig 9mm and it is like .351. Sig was pretty good about bores. Maybe I just got lucky. Did you use a set of micrometers or a verneer to measure, micrometers are the best bet for accurasie.
CD