I have had 3 Parkers that suffered stuck shells after firing. Each time the issue was with THE SHELLS ONLY, not the bores. My problems always involved Win hulls, never RST hulls. The Wincheter HS hulls have out of round extraction rims, more so than any other brand. I would warn anyone who reams chambers or rim recesses before checking the roundness of the rims on the shells using a micrometer. It's way too easy to over do it when even gently reaming a rim recess - I have and used a Clymer 12 ga reamer that I believe(it's been a while)reamed both the chamber and the rim recess and learned that it's wayyy too easy to over deepen the rim recess.....and that you can't go back once you've done that. I learned the hard way that if I just put away the reamer and used anything but Win HS hulls, to include vintage paper hulls, RIO and RST, the gun would never stick.... ever. I never run Win HS hulls through my 28 Repro; the rims are so out of round it's almost comical and has actually had me having to drive 25mi to home to put the gun in a very padded vise and gingerly clamp it shut until I could carefully work the lever and release it, which is a pretty scary operation, I assure you. I also learned to brush out any Ballistol the might have been in the chamber for a few years and had varnished up. That happened in an Ithaca 37 once - you brush that out and you're good to go. It can glue a gun up pretty hard after a few rapid shots at clays, to the point where you can't pump it. Before you touch any gun with a reamer of any kind, make sure the issue is in the gun and not just the shells. So far with me, it's been the shells every time and has nothing to do with the gun. Win hulls are especially out of round, which is easy to measure with a micrometer on a flt surface. You'll also find that the sliding guide on the reamer has the reamer NOT parallel with the center line of the chamber and bore. If you ream enough to get the entire rim recess reamed, the chamber will not be parallel to the bore center - that's a huge issue. I found that to be the case and easy to detect when you the reamer into the chamber and look closely at how the recess cutter portion is NOT hitting evenly on the recess all the way around. If you fire any shells with out of round rims, they will be forced into the nicely round original rim recess and lock the gun up, sometimes solidly as hell. The older Win HS rounds are generally nice and round; the more recent versions have thinner brass on the base and are more out of round, period. You can shoot older vintage paper rounds all day long for the rest of your life and never get a stuck shell if the chamber is brushed clean when you start. I will gladly ship my Clymer reamer to anyone who wants to monkey with it; I just warn you that it's not the do-all answer to shells sticking a gun shut, and most every time it's the shells NOT the gun. I haven't looked at the reamer in a long time but am beginning to remember that it might just ream the recess and not the chamber. A simple test is to just TRY to seat a shell rim into the recess backwards; if it's out of round, it will not seat, while a nice round rim on an older hull will.
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