quality control in Crosman barrels…
Being the newbie that I am, I am always seeking to learn about air rifles/pistols. Recently I have been getting into building .22xx carbines and I noticed that the barrels are different in id (in my limited testing, mostly at the breech end). I talked with Mike at T.K.O. and he explained to me how the order of creation will determine the quality of the barrels…. In fact, many others I talked with via phone, or keypad expressed that Crosman could use a boost in quality control in the barrel churning part of their factories…and from the looks of my MROD barrel I would have to agree.
Anyway, below are a few pictures of two .22 cp’s slowly pushed through two separate crosman barrels. The one on the left was pushed through a 24″ barrel that came off of a Mountain Airguns 2250. The one on the right is through an 18″ barrel that I bought online.
The 24″ barrel was not too tight in the breech and it offered the same resistance (no choke) all the way down the barrel. Notice how nicely the rifling bit into the skirt (so uniform that the pellet can be stood up at a nearly perfect right angle to the table. I would imagine that this pellet would fly downrange the best.
The one on the right, on the other hand, was very tight in the breech, and this clearly crushed the skirt and elongated it on two sides. Each side was disparate from the other and it obviously would not stand up on the table. I can’t help but wonder how this would effect the accuracy of this pellet in flight (please chime in as I am seeking knowledge here…) After this tight breech fit, it traveled down the barrel with the same resistance as the other barrel did.
First question: Is the pellet that kept the skirt uniform going to outperform the pellet that is deformed??? I assume yes, but I know what happens when I assume.
Second question, what can one do to address this “tight breech”? I have ideas, but I defer to the experts. Thank you!
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Viewing 9 replies - 1 through 9 (of 9 total)
😆 your not the only one man.
synopsys, that taper with the misssing rifling is stock, mine was like that too, but some pellets were vey hard to push into the breech so i polished it slightly and it made a world of difference for pushing pellets into the breech.
i also ran a patch down my bore with jb bore cleaner a few thousand times.
This should cread a uniform lead in and no more damaged pellets
Dave
What Dave said… 😉
😆
I use a pellet seater to shove that sucker in. What I have noticed is that just the end is tight and the rest is nice so the pellet in some cases will go too far into the barrel…
I would slightly taper the end so the nose goes in nice and you still seat the skirt into the rifling. I think too tight and too loose is bad. Problem is not all pellets are created equal… 😕
Tight is better than loose… 😉 😆
i lightly lapped out the breech end of the 24” condor barrel to ease loading , some types of pellets would hardly go in.
as bad as the one pellet is, it seem you could see something in the barrel.
you could try and push the pellet in to marked lengths and go to other end of barrel and push it back out to determine exactly where the problem is.
It is at the breech, however, thanks to SYNOPSYS, I think I may have realized the human error in my testing 😳 Yes, I am half retarded, only half mind you…I didn’t remove the “patch jag” off of my rod and this would explain why it was flattened on the two sides only. I bet when I get home from work that curve on the jag will fit the pattern on that deformed skirt for sure 😳 😳 😳 😳
So the reason why it didn’t happen in the 24″ barrel is because the breech was a little wider.
Now since the cats out of the bag and we can all have a good ol’ laugh at my expense, which breech is ideal? The tighter one, or the looser? Where talking breeches here, not vg’s!
Are you sure you didn’t do that damage pushing it down the barrel? 😯 That pellet pretty is messed up… 😯 It looks out of round, the damage should be all over and not on just two sides unless your crown is pinched…
Did you do more than one in the barrel that produced the messed up pellet…?
I noticed that my TT tunes 24″ .22 cal has been opened up at the breach end. It looks like he carefully removed the rifling and then tapered it back for a nice transition back to the grooves……
I can try and take a photo if that would help… 😕
need to shoot em first and see how they perform.
i lightly lapped out the breech end of the 24” condor barrel to ease loading , some types of pellets would hardly go in.
as bad as the one pellet is, it seem you could see something in the barrel.
you could try and push the pellet in to marked lengths and go to other end of barrel and push it back out to determine exactly where the problem is.
It seems that the heads of the pellets are not getting any where near uniform
rifle marks…. The deformed on seems to have marks on one side of the
head and not the other…. That can’t be good….
I suggest using a conical hand reamer to form a taper in the breech, like on the AF rifles.
This should cread a uniform lead in and no more damaged pellets
Dave
Viewing 9 replies - 1 through 9 (of 9 total)
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Ah, never really noticed it on my 0.177 caliber barrels… I’ll have to check the 12″ .22 barrel I have that I have never even used…
Learn something every day… 😀