9mm bore diameter size regarding S&W M&P guns and Sig Sauer guns

[tomr]

Check a box of commercial .357SIG FMJ and notice that it has flat point bullets. This is because a the short bearing surface of a long, gradually-tapered 115- or 124gr .355" projectile is a poor match to the short neck of the .357 SIG case.

Google ".357 SIG setback flat point coal" sans quotes, and you'll find it discussed in many a thread like this one.

Ah! Thanks

[Fire-Medic]

TY Tamara I had not seen this until now but you covered it perfectly.