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PostPosted: Thu Jul 03, 2014 9:44 pm 
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Hi,

I couldn't help notice that I was lacking in fire power last week at GTAC. A little more oomph would have helped with some of the reactive targets, so I dug around in the spare parts box and put together a 2240 with a 10" .22 barrel. I set it up for 480 fps and was sighting it in. I was just starting to get there when I ran out of gas after about 35 shots. I was a bit surprised, I had a number more like 60 shots in mind for a 2240, with a shorter barrel, although maybe at a little lower fps.

I guess I need to check for leaks. I didn't have a .22 probe so I put a bigger o-ring on a 177 probe and called it good. Maybe that's a factor, although visually the fit looks reasonable.

Pellets are Crosman hollow point.

Jim


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PostPosted: Thu Jul 03, 2014 11:36 pm 
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Location: Alberta Canada
EverHopeful wrote:
Hi,

I couldn't help notice that I was lacking in fire power last week at GTAC. A little more oomph would have helped with some of the reactive targets, so I dug around in the spare parts box and put together a 2240 with a 10" .22 barrel. I set it up for 480 fps and was sighting it in. I was just starting to get there when I ran out of gas after about 35 shots. I was a bit surprised, I had a number more like 60 shots in mind for a 2240, with a shorter barrel, although maybe at a little lower fps.

I guess I need to check for leaks. I didn't have a .22 probe so I put a bigger o-ring on a 177 probe and called it good. Maybe that's a factor, although visually the fit looks reasonable.Fit maybe reasonable but once applied pressure enters the system your leaking. Correct clearances for an efficient system means everything.

Pellets are Crosman hollow point.

Jim

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PostPosted: Fri Jul 04, 2014 12:19 am 
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Location: Victoria, BC and Clarkston, WA
I would suspect the probe too.

If you need a probe or o-ring, let me know Jim.

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-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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PostPosted: Fri Jul 04, 2014 5:20 am 
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OK, that sounds reasonable. I'll sort out a new probe and try again :)

Thanks!


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PostPosted: Fri Jul 04, 2014 9:06 pm 
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That seems to have done the trick. I managed to get the handle out of a standard 22 bolt so that I could put it in the steel breech (tapped it 8-32 for a normal bolt handle). I haven't had time to shoot a complete CO2 yet, but I put 55 shots through and it's still going, so a definite improvement.

Jim


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PostPosted: Fri Jul 04, 2014 10:46 pm 
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Hmmm Ok Jim now I'm very curious . . . . Hoping we'll see your new creation on Monday night. . . . wondering if I should also be a bit concerned? LOL :lol: :wink:


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PostPosted: Fri Jul 04, 2014 11:18 pm 
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Location: Toronto
James you are our airgun boffin!
I love it.

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PostPosted: Sat Jul 05, 2014 6:47 am 
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Yes, I plan on bringing it on Monday, although the accuracy is a bit lacking yet. Still, as long as the pellets go down range, eh? It's not a pretty sight mind you. I call it "little stumpy", or stumpy for short :)


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