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I just saw this, sako22rem. Unfortunately, a fellow (j0e_bl0ggs) that used to know where to get those sorts of items, just passed away. I'm guessing you've looked in all the places I would look, but I'll scour around and see what I can find.

Paul

I'm getting carried away. Again. I need to put some design constraints on this thing in order to keep my eye on what I want this rifle to be. Namely: A reloadable, QUIET, 'garden gun'. I neither need, nor want, "maxes". So...

I think a 60-grain, Hornady FlatPoint is fine!
I think a .22 RF muzzle velocity in the range of 1200 to 1500 f/s is fine. Maybe, if I can pull it off, something subsonic like 950 f/s too.


Paul

Hmm... Been down this road before. "It's" coming back to me.

The. 25-20 is likely the perfect choice for this project. Its MAX breech thrust is 6655 Pounds.

Using the Hornady 75-grain V-Max, I can deliver 575 ft-lb, at an impact velocity of 1860 f/s, to 150 yards at a breech thrust of 4520 Pounds, with a trajectory of plus and minus one inch. That's 'only' 2.5 times what the .22 LR 'pushes' on the breech. The .25-20 is The One.


Paul

The diameter of the rim of the .22 Remington Jet is 0.440". (Radius of 0.220".) Therefore, the area of the head is pi*0.220"*0.220" = 0.152 square inches. The SAAMI max pressure for the Jet is 40,000 PSI. Therefore, the MAXIMUM thrust on the breech face is 0.152 square inches*40000 pounds per square inch=6082 Pounds. So the design of the breech will have to be such that it can withstand 1.3*6082 Pounds=7906 Pounds. (SAAMI design specs require an action to withstand, without deformation, the max pressure PLUS 30% .) I'll round that to 8000 pounds. That is if I end up using the Jet case.

Doing the same math for the Hornet case, I get: 5442 Pounds of MAX thrust on the breech. Hmm...

Doing the math in the .22LR, I get: 1893 Pounds of MAX thrust on the breech.

So the original breech can absolutely handle something slightly less than 2000 Pounds of thrust. The Jet represents a 4-fold increase over that.  Hmm...

That is if I choose to load to max pressure. Which I never do.


Paul

https://www.trackofthewolf.com/Categories/PartDetail.aspx/0/1/LOCK-LR-1100-MS


Looks like TotW may indeed have something I can use. Keeping my fingers crossed.


Paul

http://thehunterslife.com/forums/showthread.php?t=15614
Drop down to post #32 to see the appropriate pictures.

And I'm going to give it a try.

But not in .22 RF.

At the moment, I'm thinking .25 Hornet or .25 Remington Jet. Why .25 caliber you ask? Because I have a 21.5" barrel stub left over from a "gov't project". (Project halted by me because of stupid moron gov't reps.) That barrel stub has all the 'meat' necessary at the breech end from which I can machine the "receiver".

Why those cases? Because I'm looking for a reloadable cartridge with ballistics - both internal and external - on the order of a rimfire cartridge; ala the .22 WMR. This is a 'spiffy' little action, but it's not a STRONG, spiffy little action. .22 RF chamber pressure standard is 24kPSI. Both the Hornet and the Rem Jet chamber pressure standard is ~40kPSI, BUT... I don't HAVE to load to that pressure.

I am certain I can make every component, except one: The hammer. I have taken the "action" apart into its elemental pieces, and the hammer is the only piece that looks like a real challenge. The shaping isn't too intimidating, but the placement of the holes for the pins is extremely critical. Just not sure I can get that right the first - or even third - time. Maybe. Maybe not.

Another component that would be difficult for me to make would be the hammer kocking spring. However, there are lotsa black powder folks "out there" that can do that, and I will have one of them make it for me. It's possible, (I haven't checked yet), that Track of the Wolf (TotW) might have one in stock that I might be able to use or modify to use. At any rate, concern for getting that spring pales in comparison to the concern over making the hammer.

Not sure I'll make a trigger group. I was initially thinking I'd just use the existing group and the stock. However, if I'm going to the trouble to make the "barreled action", I might just go the whole nine yards and make a whole new rifle. Have to wait an see on that front.

I'm trying to think of ways to beef that breech up. As designed, the rearward thrust is held by the two screws in the 'ears' of the 'trapdoor-type' breech block. Larger screws and beefier 'ears' will offer some improvement. I can, of course crunch some numbers on 'bolt (breech) thrust' and get a mechanical engineer to provide specs based on screw diameter and ear thickness. But... I might just 'wing it'.

Anyway, I'll post everything about the build here in this thread.


Paul

We have a new member - Antisocial Sami. The good news is that he is an actual person interested in THL!:biggthumpup: How do I know that, you may ask? Because he is the son of one of our members - SmokeyJoe and a friend of deceased member j0e_bl0ggs. Another Brit. He's here to learn, so keep that in mind, and point him to threads you think would be informative and instructive.

Paul

"...who needs a rifle to get rid of ferals. "

Right on! Feral cats are incredibly hard on the local small critter population. And for one THAT size, "small" gets to be pretty big! That one has to be pushing 20lb/10kg!

Paul

"Sorry for the continuous posts..."

You're kidding, right? :)

Great poctures! Puppies are fun! And annoying!

Paul

Paul

Which one has the mountain lion motif? Or do both? I have one with mtn lion on in it.

Paul

I'm sure you're right about the. 25-06 and the Contender. More reason to part with it. Neither do I want or need another rimfire OR Hornet.

Paul

I have a soft spot in my heart, (some would say in my head), for quarter bores, and a .25-06 is right up there on The List. If I rejuvenate this receiver, that's probably what barrel it would get. Alain has fabricated a couple of Contender lumps, and welded them to bbls. He did excellent work. I don't think I could replicate it. Which means purchasing a barrel. Unlikely at this point in my life as I'm in the reduction mode, not the acquisition mode.

Paul

I have had a couple of Contenders (chambered in .22 Hornet and a .223 Rem) for a while. Anything switchbarrel has my interest.

This frame was a complete action j0e_bl0ggs was going to build on. Part of trying to figure out how to get a receiver to him through the mail was to gut it, send the guts to him, then figure out how to 'diguise' the frame. Never could get that last part figured out. Now that he's passed, I'm trying to figure out what I want to do with it. Getting the guts back from the UK will be nigh on to impossible, so I either replace the parts here, or sell the frame.

Paul

As it turns out, I have a Contender frame that I would like to either replace the 'guts' in, or part with/trade/sell. I'm familiar with Bellm. Do you have any other suggestions?

Paul