.338 RPM on 30-06 action?

[tkat]

Has anyone put together a .338 RPM on a standard 30-06 action? It looks like it would be viable, but possibly a tight fit?

 

[mlawrence125]

Thats the exact action size it was designed for

 

[wtexaswave]

Works great on a Remington 700 action, been able to load 230, 270, and 285g bullets to ideal COAL and fit in stock box mag. Great cartridge if you want to go bigger caliber

 

[WW2 Buff]

I'm thinking it would work with a Tikka .473 bolt with a 300 Win mag magazine.

 

[wtexaswave]

Cartridge body dimension is closer to magnum, mine feeds better from a win mag magazine than a 30-06/308 sized feed lips

 

[bhovda]

I turned my winchester model 70 stainless classic 30-06 into a 338 wby rpm. I haven't shot it alot yet. But it has functioned good so far. 24 inch barrel and it gets box velocity on the garmin. 225 accubond 2825 fps

 

[TaperPin]

I don’t have one yet of any flavor, but the RPM case has to be the most interesting thing to come along in the past decade. What a neat project.

The 338” cartridges have taken a beating lately with poor availability and interest in all the small bores, but 210 to 225 gr bullets at 338 Win mag velocities simply work well. My first big cartridge was going to be a shiny new Ruger 300 win mag, but when I had the money together it was sold so I bought the 338 instead and I’ve been in love with that bore size ever since. Prairie dog, coyote, badger, fox, antelope, deer, elk and it was a very popular loaner rifle. Sometimes it killed 3x as many elk as I did.

Make no mistake it has healthy recoil and to be honest it took me a few hundred rounds to get over a flinch, and every spring it took another hundred rounds with plenty of dummy cartridges mixed in. That wasn’t, and isn’t a big deal and it never took much arm twisting to get me out to the range or shooting rocks. A smaller training rifle, a shoulder shield pad, scope with good eye relief, and some dummy cartridges are standard equipment. A high performance motor cycle or snow machine takes a little to get back in the swing of things, but that doesn’t mean someone should avoid horsepower.

Punching an elk tag requires also finding the dang thing after the shot, so when a bull was looking directly at me in the thick timber, it was ideal and the Partition came out a hind quarter and it still went 75 yards. Every year here guys have a tough angled shot and never recover it, sometimes with miles of tracking.

I can’t wait for a 338 RPM barrel to come along for my switch barrel gun.

 

[TaperPin]

Kind of off topic, but one thing I really like about the RPM case is it has a healthy amount of taper (.013” per inch) so clickers will be less common than the PRC cartridges, which only have something like .008” per inch. Good common sense design.

 

[Pilsner]

Is there aftermarket brass available for the 338 RPM?
I'd hate to have to pay Weatherby prices to feed it even it is just buying the first 100 rounds to have the brass.

 

[BAKPAKR]

Is there aftermarket brass available for the 338 RPM?
I'd hate to have to pay Weatherby prices to feed it even it is just buying the first 100 rounds to have the brass.

Peterson makes brass for it.

 

[tkat]

I'm thinking it would work with a Tikka .473 bolt with a 300 Win mag magazine.

I think this is the setup I am going to go with, I have a tikka donor and I have heard the 300 win mage magazine is the ticket.

 

[tkat]

Works great on a Remington 700 action, been able to load 230, 270, and 285g bullets to ideal COAL and fit in stock box mag. Great cartridge if you want to go bigger caliber

Heck yeah, that’s good info

 

[amassi]

If you want a .473 338 the 338-06, A square or AI, would be a better choice. The rpm case is a pain in the ass and expensive for ~100 fps
The 06’ based cases feed and extract much better and are dirt cheap in comparison.


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[tkat]

If you want a .473 338 the 338-06, A square or AI, would be a better choice. The rpm case is a pain in the ass and expensive for ~100 fps
The 06’ based cases feed and extract much better and are dirt cheap in comparison.


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I hear you there and was definitely considering .338-06 or the .35 whelen. But I don’t have a .338 and why wouldn’t a guy want ~200 fps more speed.

 

[Hydra6]

Is there aftermarket brass available for the 338 RPM?
I'd hate to have to pay Weatherby prices to feed it even it is just buying the first 100 rounds to have the brass.

Weatherby sells once fired brass on their website. Availability limited.

 

[amassi]

I hear you there and was definitely considering .338-06 or the .35 whelen. But I don’t have a .338 and why wouldn’t a guy want ~200 fps more speed.

What id imagine the use case for a standard length standard bolt face 338 that extra speed is immaterial and comes at the cost of reliability in feeding and extracting. 200 fps is very optimistic the rom case is reliable for 100 fps over the 06 class


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[tkat]

What id imagine the use case for a standard length standard bolt face 338 that extra speed is immaterial and comes at the cost of reliability in feeding and extracting. 200 fps is very optimistic the rom case is reliable for 100 fps over the 06 class


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Just like any other gun build from the ground up I would expect feeding/reliability kinks to be worked out ( if I wanted this done for me I would buy one off of the shelf). The 200fps is purely based off of case capacity and some basic math. And yeah I guess 200~ is immaterial where you are from, we have big bears up here though and a lot of them. Having that extra speed in your back pocket gives a guy a little peace of mind.

 

[amassi]

The kinks are in The case design not the rifle
Good luck with your project


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[tkat]

The kinks are in The case design not the rifle
Good luck with your project


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I appreciate your input, you are asking legitimate questions that a guy should be thinking about when putting together a rifle.