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Author Topic: First few shots with the Tuned B28 22  (Read 5637 times)

Offline onemountain

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Re: First few shots with the Tuned B28 22
« Reply #15 on: August 25, 2009, 04:00:27 PM »


you mentioned that the breech seal doesn't seem to be sticking up as much as the one in the pic you showed.. Do you mean it does stick up, just not as much, it's roughly flush with the face of the breech, or is it below the face of the breech?



Some Diana rifles recently have had issues with low breech seals, namely the 34's and the 350's. I noticed in the numbers you posted earlier that the muzzle energies for the shot strings you listed came out at only .2 fpe apart. So the rifle, while having issues, is curiously consistent in that regard. And having a low breech seal would be a "consistent" problem shot to shot.



I don't know if you have, but if you haven't you might want to read through this post and it's replies:



http://www.gatewaytoairguns.com/airguns/forums/thread-view.asp?tid=12000&mid=93881#M93881



as well as this PA blog post:



http://www.pyramydair.com/blog/2008/04/shimming-diana-breech-seal.html



Good luck, hopefully the issue is simply the breech seal, because if so it should be an easy fix.

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Offline DanoInTx

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Re: First few shots with the Tuned B28 22
« Reply #16 on: August 25, 2009, 04:17:13 PM »
Quote
man00 - 8/25/2009  9:21 PM

Well I guess it doesn't really matter if the gun is working 100% or not since I read on the forum here that Flying Dragon Closed.


Drop Mike an email, he will make it right.  Don't take his closing as a dissapearing act, Mike has been around for a long time and has a great following, doubt he will dissapear completely.
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Current shooters: Beeman HW97K .177 with Hawke Eclipse 4x16x50SFAO and Steve C. stock, Beeman R9 .177 with Hawke Airmax 4-12x40AO and Gene\'s Midas touch, Air Arms S200 with Bushnell Banner 6x24x40AO Rowan brass bling and Steve C. custom stock, BAM B25, BAM B40 .177 with BSA 3x12x44AO, Benjamin Marauder .22, Benjamin 397 pumper.

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Offline tjk

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Re: First few shots with the Tuned B28 22
« Reply #17 on: August 25, 2009, 10:37:48 PM »
Check the area around the breech seal and where the seal contacts the action port. If there is evidence that air is leaking,..you will see it most of the time. A properly working seal will leave a distinct "O-Ring" mark on the action,....if you're experienceing air leaking through or around the seal,,...this mark will look to be 'blown" out to one side via escaping compressed air. Evidence that there is a problem!! Try the tissue paper trick if you don't see any visible signs. tjk
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Offline tjk

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Re: First few shots with the Tuned B28 22
« Reply #18 on: August 25, 2009, 10:51:47 PM »
Your #'s do sound low for a factory sprung 28. EM Mike, he'll re-work it I'm sure. In the mean time,...I'd try a different pellet with a snugger fitting skirt. tjk
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397 Benji-98\' model    
Marksman  0035, My Fav!,CDT T\'d
Crosman Sierra-Pro,.177
Benji 392 08\'
CDT TT\'d RWS 34 .22,CP 4-16X40 AO
MM T\'d Marksman 0035
Crosman G1 Extreme
Daisy PowerLine 1000
TF-97 .22
B-28A MM T\'d
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Offline aguirrewar

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RE: First few shots with the Tuned B28 22
« Reply #19 on: August 26, 2009, 04:26:08 AM »
the B28 tuned by Mike shoots between 840-850 fps with 14.3 gr. pellets at least mine does

I don't think the pellets are the culprit since I shoot Gamo, RWS, Crosman and velocity is not an issue but accuracy does matter with different pellets

your problem is the breech seal, change it and do another string of pellets, if this does not work then we go to plan "B" that spread of 601 low and 676 high in fps is to erratic with a 75 fps difference between them

warren
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Offline man00

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Re: First few shots with the Tuned B28 22
« Reply #20 on: August 29, 2009, 09:43:14 AM »
Ran across a review on the "BAM" don't know if they the same as Xisico or not.  This was in the 177 cal, using 11.6 grain fps was 539.  So mine I guess isn't too far off.
http://www.airgunadvice.net/viewtopic.php?t=7239&highlight=b28
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