Fails to fully seat with p211 gto. - Magtech 9mm Luger 124 Grain Full Metal Jacket Brass Cased Pistol Ammunition

Breaking in Sig P211 GTO with various target ammo. With Magtech, it does not always seat fully in the barrel and fails to go into battery about half the times. When it fails, nudging the slide forward about a millimeter then loads the round. Swapping stock recoil spring for the stronger one does resolve the problem, but it's not ideal. Using Aquila 124 gr. Also works 100% of the time with either spring, but then swapping back to the softer spring, the Magtech ammo then has the same problem as before (while Aquila continues to work fine).