Home Forums Hunting & Shooting Long Range Hunting 7mm chambering - looking for suggestions

Are the 7mm Rogue, Mashburn, and 7mm/.300 Win all based off ofthe .300 Win? It sounds like the Rogue has the shoulder set back further and a longer neck. What's the difference between the other two?

What are you going to be hunting?

Some of the options are real barrel burners. Are you going to shoot this rifle 100 times a year or 1000?

Tough to beat the 7Rem Mag. But if you want something a little more unique, I really enjoy my 7STW.

Both have really short necks. The 7mm Weatherby will last longer than a 7mm Rem and get you about the same performance. A 7-.300 Weatherby will last longer than a 7STW and gets about the same performance. I had them all and agree with Lonnie at Hornady that longer necked cases extend barrel life. His experience dwarfs mine.

Which options are you talking about that are the barrel burners? And please define you're experience with it.

Thx

Dober

7mm Rem M, 7 STW or 7 mashburn

The Rogue and Mashburn both have longer necks than the 7/300wm.

Reckon if you want some giddy-up the 7mm-300WBY wouldn't be a bad choice. Not being familar with the RUM's ... other than name would there be a difference?

Pretty sure the Mashburn has the longest neck of these three;I know it has a longer neck than the 300 Win necked down....and I think Travis made the neck of the Rogue shorter than the Mashburn for a skosh more capacity.

You can only tweak a 300 Win Mag so many different ways and you end up with pretty much the same results.I think bullet seating and throats will affect where you end up, velocity wise,more so than with case design among the three....the 7mm Weatherby is a good example of this...freebore and high pressure make it "show" with a Mashburn...yet its capacity is about the same as the 7RM.

Time to drop back and rethink all these ideas. OP said he had a 7 RUM donor that means a big bolt face .either base it off the parent or make dang sure up frt the 2-3 thousands head dia won't be a problem as well as magazine geometry,feed rails ,and follower.Might as well make it a 7 RUM and load it down to get all the others or start with a long box mag action chambered for the stock 7mm Rem Mag with a throat cut so you can seat your choice of bullet with its base at the neck shoulder juncture. Hagel throated one like that years ago and got 175 smoking right along. My 30-338 will stay with my faster 300 Win throated this way.Best of luck with whatever you decide. Magnum Man

Bob is correct, the Rogue does have a little shorter neck than the Mashburn and a few more grains of capacity.

I don't know if you would have feeding issues with the action being based on the RUM and going to the smaller dia mag cartridge. If there is that is where the .375 Ruger necked down would probably work well and have plenty of room for seating long bullets.

Some receivers will work fine even though the feed lips were cut for the RUM's. It just takes trying it and making sure the belted mag cases will stay down in the magazine and not come flying out.

If you are into a wildcat at all you might try increasing the neck on the RUM by pushing the shoulder back a little. It would still hold as much as a .338 RUM and most likely match the velocity of an STW. But with the longer neck the barrel would last longer.

My vote goes for the 7LRM! 72.8grs. of H1000 gives me 3145fps with a Berger 180VLD out of a 28" 5C Broughton tube. It shoots!

Talk about peas in a pod....my Mashburn load for 175's is 73 H1000 for 3075 from a 24" barrel.....looks like Art Mashburn had it nailed 60 years ago.

I've hunted here and there with the 7mm SAUM, 7mm WSM, 7mm Remington Magnum, 7mm Weatherby and 7mm STW.

The easiest ones to get to shoot well are the short-fats, but I prefer the SAUM over the WSM due to its longer neck, plus a little more bullet room in a typical magazine. The ballistics are about like the .280 Ackley. A 160 at 3000 is easy to do in a 24" barrel, but not much more.

You couldn't run fast enough to give me another 7mm STW. It erodes throats pretty damn fast due to the short neck and large powder capacity, and I can get the same ballistics from the 7mm Weatherby. The factory brass of the Weatherby is expensive but REALLY good, and it's easy to get 3100+ out a 175 or 3200 out of a 160 from a 26" barrel with the right powder. Retumbo works quite well.

Fact of the matter is it seems a lot of these various 7 magnums are very similar,not seperated by much in the way of velocity...at some point a guy has to make a choice and run with it.

What strikes me about a lot of them is that we have not really come very far over the years....more choices maybe but in terms of performance the bullets are what gives them all more testosterone.

So what is the diff between the 7mm-300win mag and the mashburn? I always thought that is what the mashburn was? How are you guys making your brass?

Whew, what a bunch of rifle loonies we have here! You guys are making my head swim with all these wonderful wildcats... except I got tired of wildcats. I prefer the trusty old 7 Rem mag. Easy availability of high quality components, less expensive dies and cases because it's a standard item. You can get RWS brass. It won't burn barrels like the RUM or STW, and I'm sure the LRM is no better. When I had my last one built my smith's opinion was if it's a 7mm, it's a Rem mag. Easy to load for, accurate, good barrel life. It's hard to argue with a rifle that shoots minute of marmot at ranges in excess of 1300 yards.

partagas there isn't much difference...really just a shorter neck for the 7mm/300WM and the Mashburn is blown out just a little,and has a wee bit less taper. In terms of velocity they are the same/same.

To form a Mashburn, you simply neck down a 300 WM case and bump the shoulder back a bit for a longer neck,in one pass through a form die.You leave the case length the same.

The Mashburn was originally formed with necked down and blown out 300H&H brass because it originated before the 300 Win Mag...you might even say the 300 Win Mag is actually a necked up Mashburn with a shorter neck,because the Mashburn came first.

Both are really intermediate-length magnums;short enough to still work through 30/06 length actions,but longer in the body than the 7mm Rem Mag or Weatherby, 338,264, etc.