Home Forums Hunting & Shooting Hunting Rifles Another 7mm Mashburn Super question

Brad, Dober is the cult leader, no question....

U sent one to Skane and he posted it for you

Dober

https://www.24hourcampfire.com/ubbth...Number/4471802/what/showflat/fpart/3/q/1

See if this works..?

Dober

Oh yeah!!! There it is! Thanks Dober!

I'd a never found it!

RD thanks to you, too!

Left to right:

1)7 Rem Mag case .....

2)300 Win Mag after a pass through Mashburn form and trim

3)Fully blownout Mashburn case (using COW method)

4)Loaded 7RM

5)Mashburn with 160 Nosler Partition.

I've read through that before. The 7Practical looks like what we really are looking for since it is so easy to do. Allows the gunsmith to use 7RemMag go-no go gauges when chambering.

You can do that with the Mashburn too I believe... Any thoughts on just running .300 Win Mag brass through a 7 RUM or 7RSAUM sizer in order to form brass?

Sounds like at least two people are able to form brass by way of running .300 Win Mag brass straight into the 7mm Mashburn dies before fireforming. Gotta be gentle though.

That is exactly what I plan on doing.

Thanks BOB and RDFin. Makes me wish i had one. I will just have to be happy with my 270-300WBY

Now looking at these side by side pictures, the question of using the 7 Rem as backup ammo if all is lost in transit is answered. It can be done but is a not good idea except in case of emergency.

At the range one day a fellow had a mid-50's rifle that he had inherited from his Gfather. I asked what it was and he said 7 Magnum. I looked at the brass, he was shooting 7 Rem in a Mashburn chamber. I asked why and he said he could buy the shells locally and they worked. Accuracy wasn't stellar but in a pinch in the way backs with lost ammo/luggage.

This is from Nathan Foster, the 7mm Practical guy when I asked him about using a RUM or RSAUM die to form cases:

Hi Mark, yes, you can use the 7mm Rum die but you will have to cut it back with a grinder and cut off disc (have done this before). The RSAUM die will work as well providing you have a long stroke press. If you want a generic neck die, the hornady �7mm Magnum Neck� is the correct die.

Before you go too far, check the body diameter of your reamer to make sure that you can use neck sized .300 Win Mag brass. If the body diameter of the Mashburn reamer is smaller than factory .300 Win mag brass, you will need to contact Hornady and have them make you a full length resizing die, they will also need the reamer measurements. Lonnie Hummel is the man to speak to, he is very good, makes excellent custom dies. It took me quite a while to obtain the ideal reamer body diameter for the Practical so that it would easily (and continually) utilize neck sized brass. If you find that the Mashburn reamer is going to be difficult to utilize, the 7mm Practical reamer can be obtained from PTG and is pretty inexpensive.

If you get stuck or are confused about any of the above, please get back in touch.

Cheers, Nathan.

Mark and Bob could sell ice cream to Eskimos.

I really do like the Mashburn concept...

Yeah I think you are right, my brother has this old pushfeed Winchester 7mm Rem. Mag that he isn't using........nah I better not.

I've got a reamer.......

For what? I am confused....

Little thing called a Mashburn, you may have heard of it. Not sure what I'm gonna do with it.

Oh...OK...I thought you were leaning to the Practical, which was why I asked...

Oldelkhunter: I just report results....

Everyone is free to draw their own conclusions.

At this point I really don't know where I'm leaning. May decide to can the supercharging for now and just go with the 7 Rem Mag as is, all these extra costs I'm looking at are eating into my hunting budget, and I've got a lot of hunts planned this year: numerous deer, elk and antelope hunts, plus a bear. Just not sure I want to spend more money reaming, tweaking the magazine and bolt stop (not necessary) and dropping major coinage on dies plus leaving the gun out of commission for a few months. Need conserve the gas money, and Wednesday is leftover tag day for Wyoming, plus I need to plunk down some horse rental fees now that my buddy with the horses has backed out of the backcountry hunt.

Things are adding up fast, might have to call her good as is. And I'm already sporting a 26" barrel, which should be good for over 2900 fps on those 175s.

Stuck in indecision mode right now.