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As a general rule i never load a new magazine full. Stick to 10 round strings, then progress up to 15. After about 200 or so rounds the springs will loosen up enough. Now, if your getting issues with only 10 in the magazine, seperate that magazine from the others and see if problems continue. It may be a bad magazine.

And I said it before, and i'll say it again, just 'cause it's a SIG don't mean you won't have issues, so it could be the gun.