I found an H&R 12 Ga. rifled slug gun. I know it�s not the Cannons u-all shoot but I got it cheep and in north Mississippi is hard to find deals on big bores. I have a 45-70 SSK Handcannon pistol, and other big guns. But I saw this and thought I could reload it with slugs myself. I saw where there are 900 gr. .700 cal. bullets molds. Do any of you know if this is possible? Or is there a better way to make me a big bore cannon out of it.

You might think of reboring to 12 bore rifle....

or, rob's 12ga FH.

jeffe

jeffe;

Tell me more about the 12bore. I guess I'm showing how dumb I am but I thought a 12 gage was the same thing.

where do I find out more about rob's 12 ga FH
ok I did a search on hear and found out that it is a 50 cal done out to make it .700 so the name 12 ga from hell

do you think a H&R would take that kind of power

thanks for your time
Butch

[ 08-11-2003, 22:18: Message edited by: handcanon ]

While it could probably be bored to take a 12 Ga from hell case and would work at very low pressures ( about the same as a 3inch mag 12 Ga, a full power 12Ga FH round would put pieces of a H&R 12 Ga rifled suggun into orbit! The 12 Ga FH will operate at 60Kpsi while a std 12 Ga runs about 12 KPSI.-Rob

so Rob from what you tell me I could load it with blackpowder and it would work ok?? what kind or bullets are made for it?

what would I need to do to chang it to the 12ga FH

do you have a web page or some where I can read about it?

Thanks for your time
Butch

handcannon-- check the thread called NEWS on
this forum/ pictures and all.Don't think that
action would take the length or even moderate pressures.Here is comparison picture.Ed.

Thanks Ed.
I think I will get it just rechambered in 12ga 31/2 and that will do
Besides its just a toy if I'm going to kill something in Mississippi my SSK handcannon will more than do it.

handcannon- In 3.5 in the H&R will be great sabot shell gun,for deer and hogs.

If your into cannons, think about finding
a strong big enough action,
and get a 12GA From Hell heavy thick barrel.
And you can still shoot 3.5s in it also.Ed.

Thanks Ed
I've started looking for an action, would like a single action like a #1 or a break down like an Encore or something.
Who will do the work for me on that action and who can I get to up this one to 3.5?
Also do you sell shells for the 12ga FH?
It looks like its going to be my next pet project
thanks to all that have helped and will help on the pet prject to come.
Butch

As far as actions are concerned, your in the same boat as the rest of us. The ONLY thing I know will work is a McBros .50 BMG action with a special bolt made for the rimmed cartridge. A .50 BMG bolt must be extensively modified for this to workl You'll need a barrel at least 1.5 inches in diameter. Their repeater action would hold 3 down and can definately hold the pressures.

I am seriously considering scaling up a Winchester highwall myself and making an action out of properly heat treated 4140. I've got all the machinists drawings and It's about time I get serious. The main problem is the slotting of the block. This can be done by wire EDM ( which I don't have access to) and/or by using a shaper after first milling the slot. After that it's less of an issue. -Rob

Why would you want or need the action to have a square hole for the breach block? Wouldn't a radius help to eliminate a potential stress point? It seems that it would be much easier to machine and would eliminate the need for a broach. I did find one picture of a falling block that had a round breach block with the front of the round bar machined flat for the case head. Then you could drill a hole, ream and hone without much of a fuss???

Would CDS-4130 tubeing work for a barrel? A local steel place can order it in 12' lengths. It's 1.25 OD x .5 ID. I was thinking that maybe it could be reamed and honed. I bought a book on barrel makeing, it makes it sound too easy. It would be easier to get 5 people to go in on the Pac-Nor order though.

In another thread I mentioned that I was at www.mountainmolds.com the other day and he showed me an 8 bore bullet cast from a special order mold for a customer. If you wanted a 12ga FH bullet mold in 1000gn, I'm sure he could probably work something out. He wrote his own bulletcad program that spits out G-code for his CNC boreing lathe, so semi-custom dimensions isn't a big deal for him.

It seems to me that a scaled up High Wall or #1 would be the ideal way to go. The advantage of the High Wall is that it would be a bit easier to machine but a #1 would have the advantage of being able to use some of the Ruger parts for the smaller action components reducing the need to machine those. Either way should work fine and be plenty strong enough for this 12-gage popgun.

Lar45, I would stay away from a rounded block. Although it would make the block stronger it may tend to act like a wedge and drive the side of the action apart over time. IMO

Fritz 454 is absolutely right. The reason not to use a rounded breachblock is that it will eventually drive the action appart under high pressure loads. Partyicularily if a 7 degree locking angle is used in the design. Basically the highwall, stevens 44, Ruger #1 all are derived from falling blockCannon breechblocks designs. All of those I examined use squared breechblocks. Unfortunately, you either have to use wire EDM, make a broach or use a shaping head to cut these square corners. Luckily I have a Bridgeport shaping head and all the tooling so it's not much of a problem.
As far as barrel material is concerned Pac-Nor uses 4140 and will bore them .729 for about $225. The good thing about the 12 Ga from hell is a 3/4 carbide 8 inch long boring bar will make a perfect chamber reamer.-Rob

I can understand the reason for not useing a completly rounded breach block, but why not a square breach block with rounded corners? It seems like it would be easier to machine and would make a stronger action with a radius to disperse stress instead of a square corner to concentrate stress in one spot.
I'm in Engineering school, but not an Engineer yet. Educate me.

Lar45 - Even a radius on the end of the squared off breach block will have a dividing force applied to the sides of the action housing provided there is contact between this section of the block and the action. The only way to avoid this is to provide for some clearance to the mating surface in this area. That in turn would disperse the force over a smaller surface area and thus make for a less strong mechanism for dissipating the rearward force from the cartridge upon firing. A square breach block maximizes the surface area without adding a splitting component to the applied force.