I want to shoot my Springfield XD 40 in production. A couple of questions, first the gun has a grip safety but no mechanical lever for a safety. Is it legal to chamber the round then holster ? Also the rule says I can't have more than 10 rounds in my 12 round magazine, can I put 11 in one mag then use that mag at the make ready signal as my " barney " round ? Then leave the mag in ? This leaving 10 still in the mag when the start signal sounds ? If not how is best to handle this ? Any thoughts would be helpful, I have never shot anything other than Single Stack.