I just looked at the Sig website for specs guns are 10+1 12+1 or 15+1 , first number magazine capacity, +1 if one in chamber and full magazine. My gun was originally a standard P365, I then added an XL grip module for a little more grip to fill my hand and two more rounds in a magazine, making it a 12+1 round gun. At the range I simply load ten rounds as it is much easier and I get 5 magazines loaded out of a box.
I was commenting about my Sig, looking back at your first post I see it was for a Dan Wessom PM9. which shows a magazine capacity of 9 rounds, Try like I do with the Sig, load a few rounds, insert magazine , cycle slide to chamber a round, remove magazine and then top it up to 9 rounds, insert magazine and you have ten rounds in the gun ready to go.
