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The point is to have a 50cal, sub BMG chambering with magazine feed.
505 Gibbs based with a COAL of 4" or less.
Less Than 50 BMG .510 Rifle Cartridges
- Thread starter 375rifleman
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505 Gibbs based with a COAL of 4" or less.
I have pushed my 16.25" barreled rifle to 1700fps with the 750 Amax. It may get more but I quit there, I was shooting without the suppressor and the recoil got pretty fierce. The picture is a 750 Amax loaded right off the lands @ 4.2" (with an Amax next to it to show seating depth). They will not load in the Savage long action magazine and I have to pull the bolt to get the Amax rounds to eject. However, when loaded with pulled (and sized) M33 and API projectiles it will eject a loaded round. A flat point or round nose bullet will load into the magazine. The cartridge is a cut down .300 RUM, about .25" longer than a .50 Alaskan. With a longer barrel you may get the velocity you posted above, maybe a bit more. Might be worth looking into. The problem I have run into is that it headspaces on the case mouth and so you have to get the brass cut just right.
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375rifleman
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Bravo 4 your 50 is REALLY close to what I'm looking for with a little work and reloading experimentation by me I could probably get the results I`m looking for. With a different action I would probably be able to load full C.O.A.L. cartridges. I even bet if I talked with RCBS, Pacific Tool and Gauge, or Hornady I could get some custom dies made. Maybe a 338 Lapua based action would be long enough also. Thanks for your work on your 50 cal any other information would be greatly appreciated.
I cut the brass down so that I can load it to subsonic velocity without a large amount of unused space in the case. I have heard of guys necking up full length 375 Ultra Mag brass, that would give you almost another .5" of case capacity to play with.
375rifleman
Well-Known Member
I don't really want to go subsonic and if I can get a 750 grain A-Max to 1700 FPS it will stay supersonic until ~1100 yards because of the high BC of the bullet.
375rifleman
Well-Known Member
Does anyone have any information on the 375 RUM necked up to .510 caliber wildcat ? Thanks in advance for any and all thoughts opinions or answers.
375rifleman
Well-Known Member
I tried to contact the people who designed the 500 MDM but since they required me to put what company I worked for as well as my address I couldn't.
I have my reamer made by Pete at PT&G, and if I'm not mistaken a set of GO/NO-GO gauges built for a full length UltraMag case necked up to .510. Send me a PM if you want to borrow them.
Give Pete a call, he may have made these for others and might have some info.
As for B&M, I contacted them a few years back when they were having SSK build for them (if memory serves me right). I contacted SSK but just didn't like the attitude over the phone, and I wasn't just prodding info I was wanting them to do the barrel and suppressor.
Give Pete a call, he may have made these for others and might have some info.
As for B&M, I contacted them a few years back when they were having SSK build for them (if memory serves me right). I contacted SSK but just didn't like the attitude over the phone, and I wasn't just prodding info I was wanting them to do the barrel and suppressor.
