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I've watched that video a few times :)
Here is a link to that thread I mentioned by another builder of a four bore Jones Underlever.
4 bore build

If you look at this man's profile, he has several threads on his four bore project, you might like to look at them.
 

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Discussion Starter · #22 ·
I got really bored on a sleepless night and modeled a cartridge case and slug in CAD and 3D printed it out and threw some paint on it to get an idea of what I'm getting into as I've never actually seen a 4 bore in person. My lord I never thought my 12 Gauge from Hell would be dwarfed. I am so excited 馃槄

The slug I modeled would be approximately 2000 grains there abouts of pure lead. Here it is compared to my 726 grain .729 mono

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45-70 is severely outgunned and .22lr is looking like a novelty

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The brass I modeled after is made by RCC. It's 4.25" long. Why it's not 4", I have no idea. They are likely who I'm going to go with for brass as I can get 50 for the same price as 10 from RMC
 

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Discussion Starter · #23 ·
A guy I've been chatting with who owned this 4 bore double know as "Mastodon" shared a picture of an entrance wound and recovered projectile on an elephant he harvested.

Here's the rifle, I won't fullscreen the game photo.
Screenshot_20210117-140704_Google.jpg
 

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You fine folk are making me have fond memories of my gunshop days and my participation in the load development and test firing of a series of .700 nitro express rifles for a Hollywood producer / film making big shot...
Thanks for the likes guys - being acknowledged as relevant to this caliber of endeavour or thread means a lot...

I still have maybe 40 loaded .700 nitro express rounds (head stamped "Walts Guns" or "MDVY Xpress") and possibly 30 empty cases...

I have projectiles from Asquare and Barnes and we had a lead mold made up for rapine loads or double end target wadcutters with a gas check that I still have a dozen examples of...

I was checking my field note spiral flip up notebooks from back in the day when we were test firing for loaf development and for rifle performance capabilities and if I do a rough tally it appears I fired approx 126 assorted rounds of .700

I suppose at that time I might've been the round count world record holder - but I am probably off the radar today and not on anybody's top ten list or rank...

We also did a super heavy benchrest / sniper rifle in .577-450 with long range capabilities on Coors shutzenfest brass from new Zealand and Australia - not only testing out target wadcutters and rapine loads but monolithic solids in copper and brass - paper patching experimental loads on soft lead round nose lighter projectiles with a discarding base - shotgun style aero shaped discarding sabot rounds - even round ball...

Precision long range match grade ammo for the .55 boys or rebarreled .50 BMG variants with sub caliber accelerator sub munitions...

Been awhile but you provided a pleasant reminder and I just had to dig some stuff out to handle again (see pictures)

Thanks at least for allowing me to intrude on your thread - made me smile...
 

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I see a stamp that says 936x950, would I be correct in assuming a .936 bore and .950 diameter in the grooves?
 
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Yep it is what it is and at least they had one in stock, if I had been able to take on the job it would have been a 6 to 9 month wait, I'm that far behind the 8 ball. On the bright side of things I am getting faster at things in the shop as I slowly build up strenght and stamina.

That barrel does look pretty nice! I told you they do make a good barrel even if it isn't a true 4 bore. :)
 

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Discussion Starter · #31 ·
Working on my cleaning kit. It's the little things like this that can be easily forgotten when tackling a heckin big project like this. It will be a while before I can send off the barrel to the maker, so I'm doing little stuff to make life easier down the road. I picked up a Harbor Freight 7x10" lathe specifically to do this project. I have never used a lathe in my life and I gotta say, this harbor freight piece of junk has been making learning a chore. I'm slowly getting there though. The brush is a stiff nylon that I cut down and inserted into a fitting I made. The threaded inserts were turned, threaded, and pressed in to the brass tubing with a little heat. I then faced them once cool and locked in place. Tomorrow I have a few more threaded inserts to make as well as gluing the brush into place with epoxy. The handle will be English Walnut with a roller bearing. Definitely a fun little project.

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Discussion Starter · #33 ·
The jag is done. Took a long time, but I'm sure I can do it again faster with better results. This was a huge learning experience in how my lathe operates. I had major problems keeping it concentric, likely because the 1" stock wasn't chucked perfectly. I managed to get it concentric by threading it, and boring and threading a smaller piece of brass. It got me perfectly round, but I lost the dimension I wanted by a few thousandths. I might give this another go, now that I got an idea of what I'm doing. Still, it polished up nice and looks pretty. Now I need to make a handle to fit on the bearing and make a case.

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Discussion Starter · #35 ·
So, I turned this 4 bore solid to get an idea on what bullet design I want. I won't be making bullets myself as my lathe can't hold the tolerances like a swiss lathe can. I'm still not sure if I want brass or copper solids yet. I'm definitely having a mold made for lead though. Here are the specs for the solid here, .950", 1.48" long, 4.8 oz / 2100 grains. I was aiming for an even 2000, but my math may be off. Or it could be my scale. I tried weighing it on my digital powder scale, but it maxed it out, so I used my wifes food scale. Will weigh it at work on a calibrated scale.



.22-50, .45-70, and my 12 Gauge from Hell solid for scale

PicsArt_03-17-12.31.08.jpg
 

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That's going to be a handheld cannon when you're finished.
 
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Discussion Starter · #39 ·
So, to fund this project I was planning on selling my kit car. By some strange cosmic coincidence, I was scrolling through Facebook and got to the kit car group, and none other than Bailey Bradshaw himself posted in the group, looking for the kit car that I happen to have. What are the freaking odds of this!? So, I talked to Mr. Bradshaw and after some discussion, he'll be delivering me my 4 bore when he comes to pick up the car 馃榿 I am freaking ecstatic. What a world.
 

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So, I turned this 4 bore solid to get an idea on what bullet design I want. I won't be making bullets myself as my lathe can't hold the tolerances like a swiss lathe can. I'm still not sure if I want brass or copper solids yet. I'm definitely having a mold made for lead though. Here are the specs for the solid here, .950", 1.48" long, 4.8 oz / 2100 grains. I was aiming for an even 2000, but my math may be off. Or it could be my scale. I tried weighing it on my digital powder scale, but it maxed it out, so I used my wifes food scale. Will weigh it at work on a calibrated scale.



.22-50, .45-70, and my 12 Gauge from Hell solid for scale

View attachment 248745
That's going to be like launching an anvil! Looking forward to the video!
 
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