new wildcat round
ok all,
I have been working on this new gun and wildcat round for a long time about 4 years now, I have finished and tested it on my own range today and it works. Its a 20mm cannon round necked down to 50 cal. Now the rifle works I need to finish putting it together, its based on the first generation Barrett 50 model rifle. I was not sure of it so i built it in stages and only tested the bolt barrel and reciever today. And heck yes i made a fixture to test it on and stayed about 100 ft. away from it at first. It back presure is up there about double that of the standard bmg50. The only trouble i had was when after testing it for the 5th time i closed the door on my portable shooting box and blew the darn door open from the back pressure. I should have it finished in about a month and i`ll post pics of it then. The 20mm casing are the hard part to set up, I only made 6 rounds for it and used them in my excitment today, now I have to put some more together. If anyone else has made there own wildcat round I would love to hear from ya? well im off for now I`ll post again later.
mag44pistol
I have been working on this new gun and wildcat round for a long time about 4 years now, I have finished and tested it on my own range today and it works. Its a 20mm cannon round necked down to 50 cal. Now the rifle works I need to finish putting it together, its based on the first generation Barrett 50 model rifle. I was not sure of it so i built it in stages and only tested the bolt barrel and reciever today. And heck yes i made a fixture to test it on and stayed about 100 ft. away from it at first. It back presure is up there about double that of the standard bmg50. The only trouble i had was when after testing it for the 5th time i closed the door on my portable shooting box and blew the darn door open from the back pressure. I should have it finished in about a month and i`ll post pics of it then. The 20mm casing are the hard part to set up, I only made 6 rounds for it and used them in my excitment today, now I have to put some more together. If anyone else has made there own wildcat round I would love to hear from ya? well im off for now I`ll post again later.
mag44pistol
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M44P, You have to post pics of the reloading dies and press too!! 0 -
[:0][:0]My Lord[:0][:0]
Please post pics.0 -
agree with above let's see some pix of this awsome accomplishment. 
If you only have time to do two things so-so, or one thing well ... do the one thing!0 -
well all,
After pushing my chest out and opening my mouth to soon, I have some major problems, after checking the casings later today there covered with major stress cracks and fractures, im going to have to re-due the necking and casing operation, When i tried to do this by hand I did not have the strenth so I went out and purchased a small old punch press and being a jurneymen machinist and working in tool and die for many years I made my own dies for the casing, I think im putting to much stress on the casing doing this operation so im back to re-duing the fixtures i`ve made. I can say this my range is 300 yards long with a large hill in the back of the target area, the rounds where putting a hole about 6 or 7 inchs round and i could reach all the way back to my shoulder in the hole with my arm. Im going withing the next few weeks re-due the fixtures and get it right and then post all the pictures of the rifle and making of the wildcat round. Please note this is the first time i have ever taken this endevor upon myself,I have never been tought how to do this or been shown, Im learning as I go so if I don`t say something that sounds right to you let me know I probably have not put what im trying to say in the right words.
Mag44pistol0 -
Are the cases steel or brass? 0 -
Indeed! post the pics! 0 -
the casing are brass, and I have already found the problem im going to have to remake 2 of the dies, When I made them the first time I left tool marks in the die from tool chatter, at the time I made them I knew the marks where there but did not think they would be a problem, after checking the casing with the dies the fractures are in the same place and profile as the tool marks,
mag44pistol0 -
I was thinking annealing the brass at the neck and shoulder before forming. Squeezing the 20mm down to a .50 is moving alot of brass. Any comments from the neighbors after the test firing? What are you useing for primers and powder? 0 -
How many steps in the reduction to 50 cal? I did best by adding a few steps giving each the same percentage reduction. You may need to anneal and thin the necks somewhere along the line before the last stage.
I've reduced shells the same 1/4" from 358 to 17 cal but in several stages.0 -
well im using Benchrest primers from CCI and im having to make a brass sleeve for them to fit into the caseing do to the larger primer size and i have not found a primer large enough yet to just fit the caseing, im also using Winchester 748 reloading powder, im sure there is better but im not into reloading these are my first, it trial and error for me right now. and I have only been using 2 steps to neck the casing down from 20mm (.787) to 50 cal (.500)and no I have not annealed the casing, you know I have worked as a machinist for over 20 years and I just never thought of that, but thanks now I am, Im also going to go from 2 steps to 5 steps on the necking of the caseing necking down 50 thousands (.050)at a time until i get to (.587) and then do the final (.037) necking less stress on the caseing and i`ll be sure to polish the necking fixtures to size and remove any tool marks in them, I also took the barrel and reciever into work today to have them magna-flux checked for any stress cracks to, heck who knows they could be there to. Don`t ever ask me why i got myself into this endevor but I have, and now I have to know, can I do it or not?
Mag44pistol0 -
Sorry Capt. but I smell a troll.
Some guys like a mag full of lead, I still prefer one round to the head.0 -
you need to neck down in several steps. You are placing too much stress on the cases. Neck down in about 4 consecutive steps,..and use 50bmg primers instead of CCI BR's to ignite that much WC872.
why chase the game when the bullet can get em from here?....
Got Balistics?0 -
a troll?
you know im not much into other peoples insults and I usually set them aside but hey im just thought some people might be interested, when I get this thing finished and working safely i`ll pass on the information and let the ones that are interested in making there own can have the information and hopefully build there own and make it better, like i said I have never done this before, Im not a reloader but I know alot about reloading just never got into it, I have always been interested in wildcat rounds but never took up the time until this idea hit my head from a gunshow and purchase of a few empty 20mm caseing in Lexington Kentucky. to let you have a better idea of the rifle its not a clip feed rifle, I don`t have the equipment to stamp out a clip, its a single shot bolt action rifle bassed on the barrett 50bmg. its a barrel,reciever and even has a trigger from a old mauser 98k the bolt has a 6 pin cam lock built into it do to my fear of not knowing what the heck this thing will do. I had the CCI primers given to me in a trade a few years back and being a machinist, you make what you have work, I`ll purchase the primers for the 50bmg and see if they will work and if not see if I can make them work. I never clamed to be a expert at this or clamed to have all the knolege to do it,its just one of those things that hit you and you wonder if you can? and im trying to see, if you don`t like it or believe me then don`t read or respond to my posting, I`ll leave it at that and let you in the future wonder if it was done or not.
mag44pistol0 -
If you want to make a copper crusher pressure test fixture to see where you are pressurewise, email me. I've tested up to 77,700 psi CUP units and settled on about 44,000psi CUP for an experimental round. Of course mine was tiny compared to yours but it should work for yours.
It would seem you're under primed using rifle primers. Even 50 cal primers may be too light for complete combustion. You may want to use a duplex load or flash tube ignition. Pressures will rise with better ignition. What are you using as a barrel?
If everything is still in one piece it might be prudent to sacrifice a barrel as a pressure test barrel.
How much clearance do you have between case and chamber and also between case neck and chamber? It might explain your cracking.
Recoil absorption is also an issue. You might consider a yoke mounting four automobile struts with springs in addition to copying the Barrett muzzle brake.
Give this thing a wide berth until you know what pressures you're working with.0 -
"Winchester 748 reloading powder"
Consider changing powders, 748 is way to fast for that case capacity (about like putting 60gr of Bullseye into a 30-06 case), H-5010 is probably still to fast. WC875 or IMR-7013 would probably be more approperate.
"im not into reloading these are my first"
Wildcatters boldly go where no man has been before, but in small steps backed by lots of experance. Your running into this blind. Consider getting either Accuload or Quickload software, the $150 will be cheap in both the long and short run.
"new wildcat round"
The 50-20mmx103 has been done several times before.
"its based on the first generation Barrett 50 model rifle"
Why not a falling block breach? Much stronger and simpler to calculate the stresses (not to mention fabricate from barstock).
To be perfectly honest you sound more like a Roll Player or Gamer than a troll. If your not any of those than hit my e-mail and I'll turn you on to a couple of reloading sites where people have already done similar 'cats.
Some guys like a mag full of lead, I still prefer one round to the head.0 -
Hi everyone. I'm a first time poster but a member for a couple of years now. I read this forum almost daily because the information is priceless to a true collector, but---the 50 McMillan FatMac(of course developed by the late Gale McMillan) has been around since 1996. Its still listed in cartridges of the world. mag44s a bozo. 0 -
well im glad to know this has already been done, I never checked and had no desires to check, im noticing more and more i should have kept it to myself, enjoyed what I have acomplished and go on.
mag44pistol0 -
And another goes down in flames[?]
If you only have time to do two things so-so, or one thing well ... do the one thing!0
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