Post by Big Joe on Nov 13, 2018 23:04:52 GMT -5
Well I looked on here and will dig more up off the computer in the shop but here we go...
7mm Mashburn Super Mag
Rifle is a Rem 721 that was custom built by Art Mashburn in 1956. It’s on its second owner and by all I can find its has just over 1000 shots fired in it. Approx 320 are with me owning it.
It has one load - the same load Mr Mashburn worked up for it and no one ever tried to fix it... 70gr of IMR 4350 with 160gr Sierra bullet. The notes say its running at or just over 3100fps – but when I checked it was running 3040fps as an average for 5 shots. It has a 22 in barrel and both iron and a scope on it. I have upgraded the scope - it will shoot right at .60in at 100yds for 5 shots if you are doing your part. It shoots 1 1/2in high at 100yds with a cold dirty barrel.
Brass was made from 300 H&H necked down and trimmed. I have about 60 original cases left out of the 100 dad got with it. 40 are still in the old cardboard H&H boxes they came in - never loaded after they were formed I guess. I use the old cartridges to hunt with and the reloaded ones to just let people shoot it. It actually has a very manageable recoil and people get all scared until they pull the trigger – then they want to shoot it a lot more but that’s a big negative. It may last forever if we don’t abuse it . Its recoil is about half of the Lazzeroni’s and that one is not really bad if your used to shooting big rifles. The Mash goes as fast with less powder so it’s a win there too.
I do not know just how many animals it has taken but I do know I have taken 3 elk, several mule deer and about the same in whitetails, 1 unfortunate pronghorn and a hog. With dad it has an elephant and a water buffalo to its credit. Dad took it to Africa twice and I don’t think he ever needed a second shot... I was not there so I cant say one way or the other but there are no stories of a second shot.
I found some guys still using and building them over on the 24 hour campfire some long time ago. I know there is a smith here in Ok that still cuts chambers for the thing. I was told he is decedent of Art’s, don’t know though I only ever met Art and his son Bruce as a kid. Bruce was not a smith, he was the salesman type... All of the old guys who hung around the back shop smoked big stinky cigars - my mind can still smell them and the cheap whiskey they all drunk.. me to, when no one was watching LOL... Ok this was in ‘61/’62 I don’t think mom would let me go before then I know I got my mouth washed out several times after going there with dad as it was.
From Ammo Guide
SPECIFICATIONS:
Bullet Diameter: .284 in.
Max Overall Length: 3.570 in.
Rifling Twist: 1-in-10 in.
Rifling Lands: 6
Case Capacity (est): 84.9gr water
Primer size: 210 in.
NOMINAL PERFORMANCE:
Bullet Weight: 160 gr.
Muzzle Velocity: 3100 fps
Muzzle Energy: 3415 ft-lbs
Developed by Art Mashburn of the Mashburn Arms Company of Oklahoma City, Oklahoma, the 7mm Mashburn Super Magnum is the longest of three 7mm wildcats created by him. The cartridge holds its own with the highest-performing 7mm rounds of today. Similar to the 7mm Shooting Times Westerner, this wildcat offers a performance edge over the 7mm Remington Magnum. However, with an abundance of modern high-velocity 7mm commercial rounds on the market, it is no longer necessary to wildcat to achieve 7mm Mashburn Super Magnum ballistics.
Cases can be formed from the .300 H&H series. Initial forming can be done with a 7mm Remington Magnum sizer die while being watchful of shoulder location. Finish full-length sizing in the Mashburn die.
(Thanks to Bruce Mashburn for submitting this cartridge)