Author Topic: Big Bore Pistol Build (Read 26659 times))

rsterne · « **Reply #40 on:** May 06, 2014, 12:17:54 PM »

I bought an 8 lb. bottle of #1 buckshot from Ballistics Products, and was very disappointed in the variation in diameter.... They run from 0.294" to 0.302".... My barrel is a 26" twist, 0.294" land and 0.300" groove, so they run from loose enough to nearly fall through to so tight that they are a bear to chamber.... Even muskets shot roundball better with a slow rifling twist than smoothbore, so I see no point in using that, particularly because pellets are so much more accurate than roundball.... While a slower twist rate might improve the accuracy of roundball, it would decrease the accuracy with pellets, so again, why bother?....

Bob

rsterne · « **Reply #41 on:** May 06, 2014, 12:20:03 PM »

Not quite, I made one from 5/32" drill rod, threaded 8-32 for a piece of 1/4" rod to make a shoulder for the O-ring necessary to seal it.... It's kind of a cross between a piercing pin and a check valve....

Bob

sshewins · « **Reply #42 on:** May 06, 2014, 08:19:18 PM »

As always, very nice!!

Bryan Heimann · « **Reply #43 on:** May 06, 2014, 09:20:19 PM »

I see your point. Personally, the reason I am so interested is because i can see how a serious thumper of a pistol- one that is actually practical in size and weight- and fits in the bottom of a tackle box- can be built on a small budget. And requires no special fill equipment I can't pick up at a store nearby. Maybe with seamless brass tubing for a barrel, 7/16" in diameter. Loaded from the muzzle, to avoid any major alterations so I can switch back to the .22 barrel if I feel like it.

25ACP · « **Reply #44 on:** May 13, 2016, 10:15:10 AM »

I doubt I'm the only one to completely "miss" this. Even as old as it is, it's very relevant for those of us struggling with the knowledge to build a larger caliber pistol. Thank you Bob! Any new developments on this, maybe with a SSG?

rsterne · « **Reply #45 on:** May 13, 2016, 12:55:45 PM »

Nope, sorry, I sold this pistol right after development was completed.... The guy who bought it loves it.... calls it his ".30 cal Hand Cannon".... An SSG would be a good addition, likely increasing shot count....

Bob

jackssmirkingrevenge · « **Reply #46 on:** June 16, 2019, 03:18:38 PM »

Kicking this up as the current custodian of the subject of this thread that finally found time to have a bit of fun with it

Wayne52 · « **Reply #47 on:** June 16, 2019, 05:17:21 PM »

That's too cool without a doubt !!!

rsterne · « **Reply #48 on:** June 16, 2019, 10:57:46 PM »

Check out Reply #20 at the top of page 2, to see how this thing hits....

Bob

jackssmirkingrevenge · « **Reply #49 on:** June 17, 2019, 06:54:34 AM »

There's something really satisfying about a bigger projectile traveling relatively slowly. I have some hanging steel sheet targets in the range at 80 feet, there's a perceptible delay between the muzzle blast and the impact but those 44.75 grain JSBs really smack them with some authority

jackssmirkingrevenge · « **Reply #50 on:** June 17, 2019, 09:37:20 AM »

Some recovered pellets:

YEMX · « **Reply #51 on:** June 17, 2019, 11:12:24 AM »

Very cool!! I'd like to do something similar w/a Prod and a SS valve...

TF89 · « **Reply #52 on:** June 17, 2019, 12:19:47 PM »

Glad to see this thread get life again, nice build Bob. Thanks for posting the video Jack, that is one cool and unique pistol, really love the steel plate ping.

YEMX · « **Reply #53 on:** June 17, 2019, 04:29:29 PM »

I wouldn't mind building something similar to this from a QB base either- already set up for double CO₂ carts...

rsterne · « **Reply #54 on:** June 17, 2019, 05:21:08 PM »

Would be nice if someone made a pistol grip trigger group for the QB's, huh?....

Bob

Wayne52 · « **Reply #55 on:** June 17, 2019, 08:29:19 PM »

CO2 seems to work pretty darned good for bigger bores in pistols.

rsterne · « **Reply #56 on:** June 17, 2019, 08:47:04 PM »

Yep, the large bore area helps make up for the low pressure....

Bob

Wayne52 · « **Reply #57 on:** June 17, 2019, 09:00:03 PM »

Bob when you pierce the co2 it probably fills the voids in the air tube also doesn't it?

rsterne · « **Reply #58 on:** June 17, 2019, 09:46:30 PM »

Yep, the volume after piercing includes all the air space around the cartridges.... so you end up with a couple less shots than you would if it didn't do that.... before the pressure starts to drop when all the CO2 boils to a gas.... Up until then, the pressure is still the same, and depends on the temperature, like any CO2 gun.... the cartridges are a close fit inside the tube, so really the only significant extra volume is at the ends of the cylinders.... You still have 24 g. of CO2 (12 per cylinder)….

Bob

YEMX · « **Reply #59 on:** June 17, 2019, 11:12:24 PM »

Quote from: rsterne on June 17, 2019, 05:21:08 PM

Would be nice if someone made a pistol grip trigger group for the QB's, huh?....

Bob

Absolutely... But I'll have to go the route as another GTA member and cut down a target stock... Which isn't too bad.

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Big Bore Pistol Build

Author Topic: Big Bore Pistol Build (Read 26659 times))