I've tried to use my new Brownell range rod to check the timing on a NM Blackhawk .45. The rod will only go about a half inch into the muzzle and will go no further. Micrometer says .4415 for rod. So do I have an over sized range rod or a too tight bore? If I recall correctly, I believe Iowegan recommends .439 for a range rod. If so, wonder why Brownell ships .4415. Newbie here, so school me on my situation.