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 Post subject: Customized B51 .22
PostPosted: Sat Jan 11, 2014 11:19 pm 
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Joined: Tue Aug 30, 2011 9:56 pm
Posts: 74
Location: West Coast
Hey guys,
It's been a while since I've posted here, been busy working and finishing off my apprenticeship. Things have slowed down at the shop and I've had some time to work on my Xisico B51 in .22. Last year I installed a .22 choked Lothar Walther barrel from Eric @ Scopes and Ammo. Until recently, I haven't had time to really try it out. A few weeks ago I took her up to the sticks and did some shooting at 70 yards. I was able to hit empty shotgun shells nearly every shot using Crosman Premier Hollowpoints. I tried H&N CrowMagnums but they didn't fair to well. Since then I've made an air stripper, barrel band with O-Ring support, a de-pinger and threaded the barrel for 1/2" UNF. I hope to do some more shooting at paper in the near future, I will post the results as well. I still need to chrony the gun and start tuning it. Perhaps I will look into putting a regulator in it also. Here are some photos.

Mike

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 Post subject: Re: Customized B51 .22
PostPosted: Sun Jan 12, 2014 12:49 am 
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Joined: Sat Dec 17, 2011 10:04 pm
Posts: 525
Location: Komoka Ont.
Looking good, was it difficult to get the old barrel out of the breech block and is that barrel choked, how much longer than stock is that barrel and did you do anything different at the transfer port like make it oval or something. How much work did you have to do on the lead or is that leed.

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 Post subject: Re: Customized B51 .22
PostPosted: Sun Jan 12, 2014 12:54 am 
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Very nice, great job on the air stripper :wink:

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 Post subject: Re: Customized B51 .22
PostPosted: Sun Jan 12, 2014 6:08 am 
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Posts: 2411
Location: Northeastern Ontario
Nice work, Mike. How loud would you describe the B51, and how many shots do you get per fill?


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 Post subject: Re: Customized B51 .22
PostPosted: Sun Jan 12, 2014 8:08 am 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
GarthThomas wrote:
Looking good, was it difficult to get the old barrel out of the breech block and is that barrel choked, how much longer than stock is that barrel and did you do anything different at the transfer port like make it oval or something. How much work did you have to do on the lead or is that leed.


Leade

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 Post subject: Re: Customized B51 .22
PostPosted: Sun Jan 12, 2014 2:42 pm 
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Joined: Tue Aug 30, 2011 9:56 pm
Posts: 74
Location: West Coast
GarthThomas wrote:
Looking good, was it difficult to get the old barrel out of the breech block and is that barrel choked, how much longer than stock is that barrel and did you do anything different at the transfer port like make it oval or something. How much work did you have to do on the lead or is that leed.



Thanks,
It was quiet easy to get the barrel out of the breech block. I just heated it up a bit with a propane torch till the glue started smoking then I taped it off gently with a piece of aluminum and a hammer while the barrel was held in a vice. I followed the instructions from the b50/b51 Technical Book, some people call it the Bam 50 Bible (It's on the internet as a PDF somewhere). I can email it to you if you'd like.
The new barrel is about 3" longer. The leade was cut with a tiny boring bar and the compound slide. Then I used some fine sandpaper on a match stick to polish out the transition. It seems to be pretty smooth, I've pushed out loaded pellets and inspected the skirt and head and didn't notice any damage from entering the barrel of riding over the transfer port. The transfer port is still stock. I may make a new one or drill this one out a bit after I chrony it.

Mike


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 Post subject: Re: Customized B51 .22
PostPosted: Sun Jan 12, 2014 2:48 pm 
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Location: West Coast
Penage Guy wrote:
Nice work, Mike. How loud would you describe the B51, and how many shots do you get per fill?



Thanks,
The B51 Is very loud. its comparable to a 22 short perhaps even a 22lr. I noticed a difference after the de-pinger was installed. It was more of a bang rather than a twang. I haven't really keep count with the shots, but from a 3000psi fill, I end up filling it up at 1500 psi or so after a noticeable drop in power. Maybe 20-25 shots.
There is a set screw on the face of the hammer than can be turned in or out to "tune" the gun. I've heard of people cranking it all the way out and getting a considerable drop in FPS and shot count gain.

Mike


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 Post subject: Re: Customized B51 .22
PostPosted: Mon Jan 13, 2014 7:04 pm 
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Joined: Sat Dec 17, 2011 10:04 pm
Posts: 525
Location: Komoka Ont.
I have a B50, I got a McMaster Carr spring and reduced the transfer port size to slow things down and get more shots. I made a delrin spring guide but in combination with the other parts it's only getting 450fps, I was hoping to reduce the valve face diameter to make up the difference and keep efficiency up but have yet to do so. I've left the guide stock for now and am at 650fps for 50 good shots within 4% deviation. I recently did a amateur bore lap that smartened up the accuracy, I found that the bore felt rough when I pushed a pellet through and I was having a hard time getting consistent shots over 30yds but its better now. I don't have the skills to tackle a barrel swap and other than some serious polishing I haven't removed any metal. I am very happy with the quality of these rifles even in there are a few rough edges. As far as the standard flaws I did de burr the lead at the transfer port and my filter screen crapped out even though I only use a hand pump to fill. I also shortened the stock, I found the 15-1/2" length of pull to be too much. I installed some sling swivels, the quick release type and they are a big plus when out walking around.

Garth

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 Post subject: Re: Customized B51 .22
PostPosted: Mon Jan 13, 2014 7:37 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6018
Location: P.G. B.C.
Hey- I've got one of those - kinda wish the original owner had left it as a thumbhole, though. I do like the looks of yours Mike. This one does hold more nicely for offhand shooting due to the lighter butt and increased muzzle weight - ie: as a 'hunting' offhand position -= forearm held like shooting a muzzleloading rifle.

I should shoot it more, but having fun with the HW's that don't run out of air. My Bam51 runs 25fpe with most pellets.

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 Post subject: Re: Customized B51 .22
PostPosted: Mon Jan 13, 2014 11:17 pm 
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Joined: Sat Dec 17, 2011 10:04 pm
Posts: 525
Location: Komoka Ont.
Hers my 50, I haven't refinished it yet after cutting the butt shorter, although the wood isn't the hardest the finish is tough.
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 Post subject: Re: Customized B51 .22
PostPosted: Fri Jan 17, 2014 7:51 pm 
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Joined: Tue Aug 30, 2011 9:56 pm
Posts: 74
Location: West Coast
Nice looking guns guys,
I've spent the last week trying to strip the hard finish off my b51 to stain and refinish.
anyways here are some chrony numbers. Im not to happy with them as it seems like I can get about 16 shots with a low of 930fps and a high of 960fps (crosman premier HP 14.3gr?). The fill was 3000PSI and i stopped at 21 shots (2100 psi), seemed pointless to continue.

930.6
933.4
941.1
952.1???
945.6
947.2
951.1
955.8
960.3
957.8
948.8
948.5
945.2
938.2
937.4
929.8 #16
924.6
923.6
917.2
911.2
907.3
902.3 2100psi

I'm going to adjust the little set screw inside to hammer to try and drop the velocity hopefully I can sqeeze more shots out. 900 FPS would be a nice speed to start out with. What do you guys think?

Mike


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 Post subject: Re: Customized B51 .22
PostPosted: Fri Jan 17, 2014 8:14 pm 
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Joined: Sat Dec 17, 2011 10:04 pm
Posts: 525
Location: Komoka Ont.
This is a string with mine from 2600psi-1800ps. Not as hot as yours but its with the stock spring and transfer port. I never could fill this gun to 3000, I got valve lock above 2800.
880 914 901 879
886 921 905
896 919 896
896 917 897
893 917 888
907 919 889
904 911 887
914 914 882
913 916 884
917 901 887
Here is a shot string after I installed the Mcmaster Carr spring from 1500psi to 950psi
775 805 794
778 805 794
768 804 790
784 803 789
785 806 787
790 810 783
786 804 779
788 800 777
798 806 772
792 803 770
796 800
800 800

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 Post subject: Re: Customized B51 .22
PostPosted: Sat Jan 18, 2014 9:51 pm 
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Joined: Tue Aug 30, 2011 9:56 pm
Posts: 74
Location: West Coast
Those are some pretty nice looking numbers Garth.

I extended the set screw on the hammer face a turn and a half. It has gotten the gun to start off at around 900fps (3000psi) and ends at 900fps (1700psi) after 35 shots or so. It peaks at 950FPS. It's still shooting a little hot for my liking, but I can live with it. Here are the numbers.

908.3 950.1 932.9
898.9 951.4 925.4
907.1 944.5 921.0
912.8 950.5 918.2
895.0 949.8 918.2
926.5 952.2 914.0
922.5 946.5 910.8
934.4 949.0 904.0
935.5 945.7 904.3 1700psi
938.8 940.4
941.7 939.6
945.0 935.3
948.5 934.6

I plan to use this gun for hunting and fun shooting. I think it will be acceptable even with the 50FPS extreme spread (5.4%)
Next weekend, I'm planning to go out and do some paper punching, 30-50-75 maybe even 100 yards as well. I'll post the results.

Mike


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 Post subject: Re: Customized B51 .22
PostPosted: Sat Jan 18, 2014 10:16 pm 
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Joined: Sat Dec 17, 2011 10:04 pm
Posts: 525
Location: Komoka Ont.
Looks like you've got it under control, just wondering did you polish any of the sliding internals.

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 Post subject: Re: Customized B51 .22
PostPosted: Sat Jan 18, 2014 11:12 pm 
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Joined: Tue Aug 30, 2011 9:56 pm
Posts: 74
Location: West Coast
GarthThomas wrote:
Looks like you've got it under control, just wondering did you polish any of the sliding internals.


Yes I polished the hammer to a mirror finish. Also I tried to polish the inside of the reservoir tube where the hammer slides. When I got the gun, the hammer would not cock. The slotted pin that rides in the grove on the tube was jammed. I think it was manufactured wrong. I turned it down on the lathe a few thou, and cleaned up the slot with a needle file. After a few months of having the gun, the valve stem punched through the plastic valve head. I made a new one on the lathe from delrin. I made it slightly smaller in diameter to try and smooth out the air flow. The transfer port is also stock.

Mike


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