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Hot Topic (More than 10 Replies) Tight RF Chamber (Read 4753 times)
Myers
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Re: Tight RF Chamber
Reply #15 - Mar 13th, 2021 at 2:55pm
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burntwater wrote on Mar 11th, 2021 at 8:12pm:
I’m curious about a 22LR Douglas barrel I got with a CPA rifle.  I know there are many of you who shoot CPA rimfire barrels. I bought this rifle with a 38-55 and 22 LR barrels but due to some orthopedic issues just today made up the rim fire barrel to test. On any of my match Bullseye pistols and rifles the rounds drop right in. Even my Hammerli with tight match chamber slips right in but not this CPS chamber. With Ely and RWS ammo you really have to push hard to force the round enough to chamber and the the breach block takes it from there. Did I get a worn out reamer ?  Chamber is very clean so is this normal and if so what’s  the drill cause it feels wrong.  



I also own a CPA  rimfire. From my experience they are using a match reamer that is suppose to engrave the bullet when fully chambered. Chamber a round and then extract it. Use a magnifying glass and look for engraving marks on the top band.

In all my custom rimfire rifles including a Martini MKIII and a few bolt guns they all will need finger pressure to push the round in. If you finger gets sore I use a oak dowel rod .
  
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squibshot
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Re: Tight RF Chamber
Reply #16 - Mar 13th, 2021 at 3:05pm
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The S&W "Perfected" single shot pistol has a match chamber. They were used in the 1936 Olympics. Any ammo I have tried needs to be seated with your thumb. I made a simple pusher to save my thumb. Not all have the match chamber but you know it as soon as you push a round in the chamber. BTW my CPA requires the breach block to cam the cartridge in also. I think you are all set. Enjoy knowing you got the best set up.
  
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uscra112
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Re: Tight RF Chamber
Reply #17 - Mar 14th, 2021 at 5:08am
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In a couple of respects the earlier Stevens 44 is better than the 44-!/2 about chambering and extracting .22 ammo from a tight chamber.  One is the much greater distance the breech block can push a cartridge, and the other is that the 6 o'clock extractor is actually cammed back by the breechblock by a few thou as it first opens.  Primary extraction, like the Mauser-pattern military bolt guns.  Only single shot I know that has the feature.  Sadly when they added the spring-loaded .22 ejector the camming action was not retained.
  
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tim_s
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Re: Tight RF Chamber
Reply #18 - Mar 16th, 2021 at 3:51pm
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Assuming this barrel may have at least a semi match chamber, it may very well have an easily reconciled issue .
Quite possible it was owned by somebody not good at cleaning, not just the barrel but importantly the throat, which may very well have accumulated a hard, obstructive, carbon/lead ring making final chambering tough.
Get some C4 carbon killer and let it soak in the throat....just the throat for 15-20 minutes and the patch it out, even money things get easier.
  
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