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 Post subject: 30cal B51
PostPosted: Sun Aug 12, 2018 11:31 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Good progress today on a 30cal conversion for a BAM B51.
Made a breech with up sized bolt and cocking lug to handle the larger bore.
Big ports, probe less bolt and maximized hammer stroke. Seems perky so will try for numbers later this week.
This barrel is an rsterne/seanp designed for the JSB pellet, should be a real shooter!
Walter

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 Post subject: Re: 30cal B51
PostPosted: Sun Aug 12, 2018 11:40 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1638
Location: 1/2 Way From Ottawa and Montreal,
Welcome Back Walter

and will wait for updates on this new project, sounds very interesting.

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 Post subject: Re: 30cal B51
PostPosted: Mon Aug 13, 2018 2:10 am 
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Joined: Sat Mar 16, 2013 5:15 am
Posts: 3573
Location: Edmonton
Great to see you back, Walter.


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 Post subject: Re: 30cal B51
PostPosted: Wed Aug 15, 2018 11:06 am 
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Joined: Wed Jul 01, 2009 3:23 pm
Posts: 3067
Location: Northern Ontario
Sounds cool.

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 Post subject: Re: 30cal B51
PostPosted: Wed Aug 15, 2018 5:43 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8972
Location: Coalmont BC
Cool project, Walter.... If you haven't seen it, I did a .22 cal that hit over 50 FPE.... topic65795.html

You might find some of the things I found (and changed) of interest.... or maybe not.... :wink:

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
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Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
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 Post subject: Re: 30cal B51
PostPosted: Wed Aug 15, 2018 6:58 pm 
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Joined: Sun Nov 20, 2005 10:28 pm
Posts: 1275
Location: Southern Ontario
rsterne wrote:
If you haven't seen it, I did a .22 cal that hit over 50 FPE....


Yup I sure did and now she's mine :wink:

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Airforce Condor 22 cal
UK Webley Patriot 22 cal
Weihrauch 80 .177 cal
Diana 350 Magnum 22 cal
EunJin Sumatra 22 cal 500cc
AirArms 410 22 cal
Telly .177
BSA Mercury 177 cal
Salavia 618
Shinsung 201 9mm
AirArms Tx200 .22 cal
Diana 54 Airking .22 cal


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 Post subject: Re: 30cal B51
PostPosted: Sat Aug 25, 2018 10:59 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
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Location: Rocky Mtn Hse Alberta
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 Post subject: Re: 30cal B51
PostPosted: Sat Aug 25, 2018 11:20 pm 
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Location: Coalmont BC
VERY nice, Walter.... lockup looks good and beefy, too.... "J" slot to retract the bolt?....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 30cal B51
PostPosted: Sat Aug 25, 2018 11:26 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
You got it Bob
Probeless bolt for uninhibited flow. As this gun will likely see pellets and bullets i figure seating at bore diameter will be the same as well
Thanks eh

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 Post subject: Re: 30cal B51
PostPosted: Sun Aug 26, 2018 11:44 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8972
Location: Coalmont BC
Love those "J" slots, use them in all my high-powered designs, combined with a probeless (flat nosed) bolt.... If you want adjustable power, you can use a rod that protrudes into the short slot, adjustable from the back with a SHCS like this.... You can just see the pin in the slot with the SHCS in line with it on the back of the receiver.... Screw it in and it restricts how far back the bolt can retract....

Image

When the bolt is not retracted fully, it obstructs part of the barrel port, resulting in the ability to dial down the velocity.... This gun had 9 turns of adjustment, although effectively it shot the same velocity at 7 turns out as at 9 turns.... With it all the way in, the bolt was in the loading position, and the only air providing the shot was leaking around the sides of the bolt nose.... dialing the velocity down to about 400 fps....

Image

This is particularly useful if you want to shoot pellets and bullets from the same gun, without having to completely retune it.... For instance, with the above PCP tuned to shoot the 34 gr. Beasts at 950 fps at 7 turns.... at just under 4 turns you would get the same velocity with the 27 gr. BBTs.... and at 2 turns it would still be shooting 950 fps with the 18 gr. Heavies.... It looks like you should have enough width in your receiver to do that?....
Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: 30cal B51
PostPosted: Sun Aug 26, 2018 2:06 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Very cool Bob!!

I like that setup and will check this one it is 0.950 wide with 0.312 bolt so could easily use a #10 screw with a 0.156 pin.
Having trouble finding time to shoot esp over a chrony. When work had me out in the mountains everyday it was definitely easier lol
Keep up the good work Bob, hankering to see more from you.
Walter

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 Post subject: Re: 30cal B51
PostPosted: Sun Aug 26, 2018 4:51 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8972
Location: Coalmont BC
I'm sure an 8-32 SHCS with a 1/8" steel pin would be plenty strong.... but if you have room for a 10-32 then why not.... 8)

Glad to see you back here for sure....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Profile  
 
 Post subject: Re: 30cal B51
PostPosted: Sun Aug 26, 2018 6:48 pm 
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Joined: Sun Nov 20, 2005 10:28 pm
Posts: 1275
Location: Southern Ontario
So Walter, what is the chrony numbers on this gun ? Looks good. Glad to see you post again. You and Rsterne need to get together and build and patent a high powered Canadian made airgun. You's have the knowledge. I'de be honoured if you called it the Bryan gun.

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Airforce Condor 22 cal
UK Webley Patriot 22 cal
Weihrauch 80 .177 cal
Diana 350 Magnum 22 cal
EunJin Sumatra 22 cal 500cc
AirArms 410 22 cal
Telly .177
BSA Mercury 177 cal
Salavia 618
Shinsung 201 9mm
AirArms Tx200 .22 cal
Diana 54 Airking .22 cal


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 Post subject: Re: 30cal B51
PostPosted: Mon Aug 27, 2018 12:29 am 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Thank you Bob and Bryan for the welcome back. Am happy to be here for sure!
I need to get a baseline set of numbers from this setup. 2700ish is giving 860 with 46gr FX pellets.
Hope to find time to shoot a full string asap..
Cheers

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 Post subject: Re: 30cal B51
PostPosted: Mon Aug 27, 2018 8:40 am 
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Joined: Fri Dec 30, 2005 2:14 am
Posts: 1676
Location: Calgary, Alberta
Hmm, a .30 cal B51! That's awesome!

Rich

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