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Beeman P22 Project

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Beeman P22 Project

Unread postAuthor: jackssmirkingrevenge » Fri Mar 31, 2017 8:48 am

Got myself one of these, the cheap and cheerful variation of the HW 40 PCA made of the finest Chineseium. Shoots about 410 fps with a 7.8 grain Daisy flatheads, very pleasant.


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Naturally I took it apart :D the plan is to convert it to 0.22" and have it shooting as close to 500 fps as I can manage.

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Look at that tiny transfer port, just 2.5mm diameter - less than a third of the cross-section of a 4.5mm barrel in terms of area, shameful.

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The valve is of an unusual design in that it is pulled rather than pushed open, and is already somewhat balanced, but there is always room for improvement.

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Original barrel alongside an externally battered but internally clean Crosman 2240 barrel I obtained, will probably keep most of the length and cover the excess with a faux suppressor.
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Re: Beeman P22 Project

Unread postAuthor: Gippeto » Fri Mar 31, 2017 9:25 pm

They are surprisingly good for the dollars spent. Not a power house, but fun and fairly accurate. :)
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Re: Beeman P22 Project

Unread postAuthor: fenrir » Fri Mar 31, 2017 9:49 pm

Any reason to switch over to .22 caliber? Will the longer barrel/heavier pellet create less noise? I've had a beeman p17 for a while now, but shooting it in my backyard is kinda noisy.
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Re: Beeman P22 Project

Unread postAuthor: jackssmirkingrevenge » Fri Mar 31, 2017 11:16 pm

They are surprisingly good for the dollars spent.


Given the build quality I'm honestly amazed at how little they go for.

Not a power house


Give me time :D seriously though if I can have it shooting .22 at the same velocity it was shooting .177 I'll be happy man.

Any reason to switch over to .22 caliber?


The same as it ever was - MOAR POWER! I'm not a paper puncher, prefer making holes in stuff, and .22 does more damage.

Will the longer barrel/heavier pellet create less noise?


For the same volume of air, it should give greater volume for expansion and cut down a little on noise with all else being equal.
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Re: Beeman P22 Project

Unread postAuthor: Air2theBrain » Wed Nov 15, 2017 2:28 pm

Yep i would rather more impact then FPS any day. :D

Might have to start a .22 project next year... :roll:
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Re: Beeman P22 Project

Unread postAuthor: jackssmirkingrevenge » Wed Nov 15, 2017 3:21 pm

Never updated this, what I had done was bore out the transfer port to 4mm and it had made no measurable difference to velocity for 0.177" pellets so I decided a 0.22" upgrade would be a lot of effort for limited gain.
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Re: Beeman P22 Project

Unread postAuthor: Gippeto » Wed Nov 15, 2017 8:49 pm

Did turn a .22 barrel for one of these. Despite the fellow wanting it at stock length, it was still fun to shoot. 8) Good use for a spare 2240 barrel. ;)

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Re: Beeman P22 Project

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Re: Beeman P22 Project

Unread postAuthor: jackssmirkingrevenge » Thu Nov 16, 2017 5:27 am

Nice. Speaking of 2240s, I have a used one on the way, perhaps a sub 500 fps big bore pistol a la Quackenbush is on the cards after all.
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