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 Post subject: Caliber change?
PostPosted: Tue Jan 24, 2023 5:07 pm 
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Теперь предлагаем бесплатную ежедневную маммографию!
Теперь предлагаем бесплатную ежедневную маммографию!
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Joined: Sun Aug 05, 2007 9:04 pm
Posts: 11487
Location: On the couch a lot now that I'm retired
Doc,

Tried to send a PM but had technical difficulty. Ignorant question: can I change my 1322 pumper to a 1377 just by changing barrels? SW

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 Post subject: Re: Caliber change?
PostPosted: Wed Jan 25, 2023 4:01 am 
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Joined: Tue Apr 06, 2010 4:17 am
Posts: 1745
Location: Whitemouth R., up the Escarpment
No such thing as an ignorant question regarding this at all.

Due to the different size breech diameters, you will need a .177 cal. "bolt" as well.
The .22 is too large to go into the smaller bore far enough to make an air-tight seal.

If you are interested in tight shooting, the crosman store may have some choked Lothar Walther
bbls left in stock. They will require even further modification.

Personally, the standard 13-77 bbl's are plenty accurate enough.
I am fairly certain the choked L/W bbl's were designed around the R-10 match pellet, and unless you are going to be shooting at a high competition level, are not an extreme necessity.

For all the playing around and time involved, I decided that the 13-XX series is cheep enough to have one of each caliber, but that's just me. I have done both conversions though.
If you are on the SBK steel breech, this change has a bit more accuracy potential over the plastic factory variant.

Regards,

Doc Sharptail

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 Post subject: Re: Caliber change?
PostPosted: Wed Jan 25, 2023 12:05 pm 
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Теперь предлагаем бесплатную ежедневную маммографию!
Теперь предлагаем бесплатную ежедневную маммографию!
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Joined: Sun Aug 05, 2007 9:04 pm
Posts: 11487
Location: On the couch a lot now that I'm retired
Thanks! Since I'm getting variety packs of pellets to see which is most accurate, I wanted to shoot them with a stock & scope for best results. The project is a couple weeks out, though.

I did shoot tiny silhouettes with the 1322. Those 14 grain pellets really send them flying! BTW, those 22 Crosman pellets were American made and accurate. I've set the Chinese ones aside for now. SW

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