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Have a 10mm that has only seen lead bullets and have not had any problems shooting them. Being that you are using 40 instead, will assume that it is being shot from a auto. I would be more concerned with the gun maybe not having a fully supported chamber, leading in the polygonal rifling and bullet seat depth. All these things can cause a high pressure KBM. Good observation skill are needed to avoid a problem.
Make sure that you have the proper seat depth and that the bullets are secured tightly to the cases. Check your cases frequently, make sure that there are no high pressure signs or bulges. Inspect the rifling ever 50 or 100 rounds, make sure that there is no excessive leading.
Robert
[This message has been edited by Robert the41MagFan (edited March 04, 2000).]
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