Try polishing the chamber with 600 grit crocus cloth spinning lightly on a split wooden dowel in a hand held electric drill... there may be a rough spot that holds the cartridge tightly when it is dirty after a few magazines... gently move the dowel in and out during the spinning process... and make sure that the bore and chamber and lightly lubricated by running an oily patch down the bore before shooting...
I would also recommend you try some Winchester 115 gr. ammo... to see if the change makes a difference.
Let us know if this helps out...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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