Anyone had experience with this cartridge? Is like to hear about it. Thanks in advance.

http://www.riflebarrels.com/ar...shooting_hunting.htm

Scroll down to the "Cartridges and Bullets" section.


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I have a 22-378Wbee AI reamer if you want to just skip the in-between stuff...

Rich

really, I do...

Rich,

Have you built one? Is that based on the full length Rigby case? What kind of velocity can you get? I can't imagine what that screamer would do.

The 7mm RUM is almost a overbore cartridge loaded to maximum pressure. The .378/7mm..

7mm-378 - yet another barrel burner - I suspect that throat wear will be seen in as few as 100 rounds and by 500 rounds max you will have to replace the barrel. With its smaller bore, it stands to reason it will wear quicker than the .30-378. The bigger bore .338-378 offers a much better barrel life, but is going to kick like a mule.

As a norm, barrel life of less than 3000 rounds is seen as unacceptable, and recoil is something to be avoided at all costs for accurate shooting.

In practical huntimg terms, I think the 7 mm reaches its optimum case capacity in the .280 Rem and the 7 mm Rem Mag - bigger cases like these, and accellerated throat wear is guaranteed. The 7 mm STW is already dead, having started off with a lot of hype.

The 7mm WSM and 7mm Rem. SAUM are short action magnum cartridges that attempt to gain in width the powder capacity that they sacrifice in length. In other words, they are short but very fat cartridges with sharp shoulders. They nearly duplicate the ballistic performance of the popular Remington 7mm Magnum in cartridges that will function through short action rifles.

Here is an article on 14 7 mm cartridges:

http://www.rifleshootermag.com...nition/seven_092105/

Warrior

"Overlooked by magnum maniacs, the 7x57, 7mm-08 and .280 Remington will do just about anything that needs doing with a .284 bore. American shooters seem to go through periodic phases of "magnumitis." We are definitely in one now, and I have no idea how long it will last. Fast-stepping cartridges with large case capacities are interesting, but the reality is that magnum cartridges make a lot of noise and kick harder than most of us like. That's OK if you really need the capability. But most of us don't." ... Craig Boddington (Posted: 2004-12 )

The 7mm Shooting Times Westerner popped up in the 1980s, a super seven on full-length 8mm Rem. Mag. brass. At 3,325 fps, the STW's 140-grain bullet flies 150 fps faster than the Remington round. Predictably, the difference narrows downrange, because the faster a bullet, the greater the drag. More drag means a higher rate of deceleration, all else equal. At 500 yards the 7mm STW is only about 110 fps ahead of the 7mm Rem. Mag. But the STW is not the last word in speed. Remington's rimless, full-length 7mm Ultra Mag. and the 7mm Dakota (on a shortened .404 Jeffery case) have upstaged it by 100 fps. John Lazzeroni's Firebird offers even more horsepower.

Warrior

Cane Rat,

I built one several years ago for an article in Precision Shooting Magazine. I had friends at Savage who asked if I knew anything about the barrel internal coatings. They were talking with a company in Texas, who asked them to look at a project rifle that would be a real barrel burner. I had read Ackley's books, and just had the itch. They sent me a new 112 single shot rifle, and fit four 223 barrels (1:9" twist) to it. I ran some accuracy/velocity tests, with a little help from BHA, and sent the best and worst ones of the four to them, after Bellm opened up the bolt face and chambered the four barrels. The non-treated pair lasted less than 130 rounds, the treated ones more than twice as long. I shot the JLK 80gr VLD's over 4200fps, and vaporized about one out of three commercial bullets. The only one I could not destroy was the Nosler solid base sixty grainers. 5200+fps and they stayed together. Just under an inch at 300 yards for 5-shots. Shoot the others, and at least one out of three would go 20-30yds and just Poof! like blowing on a dandelion ball. Just a little gray smoke, and no noise.

The fun part was next spring at the Hodgdon 50th Anniversary dinner at SHOT. I asked Chris Hodgdon if Bob Forker was going to be there. He had developed the original with Wbee for NASA testing. They wanted to shoot iron BB's at the capsule shielding material. Like close to 7000fps. He told me yes, and I asked to be seated next to him. Here we are at this fancy dinner, and Bob starts telling me the story. Some marketing dork sitting on my right jumps in and tells us HE had never heard of it. Bob tells him he needs to get out more, and learn to read. About that time, I take a loaded round out of my jacket pocket, hand it to Bob, and ask him if this one I have is any different. He lit up like a Christmas Tree, and started talking about the velocities they got, and what mine were. The goober just about choked, and asked to see it. He looked and looked, and then apologized to Bob and I. Forker was the head gunsmith at the Hutton Rifle Ranch near LA, and did a lot of Wbee testing in the 1955-75 era, IIRC.
I would love to have another one, just for testing the 1:7" barrels and 80gr bullets. Hmmmmmmmmm...

regards,

Rich

Well, if you got the time and money...

I'll put my money on nice guns with effective, classic cartridges

m

Rich,

Some people own and race Ferraris. Some people are happy with a Prius. Some people never know there is a difference.

Normally necking down increases velocity.

considering that there is NO velocity difference between the 7mmRUM and the 300RUM
with bullets of similar sectional density one could easily concude that the 7mmRUM is pointless.

that being said the exact same conclusion could be reached about the 30-378 Vs a 7mm-378
As the xx-378 is a ballistic twin of the RUM

AD

quote:

The non-treated pair lasted less than 130 rounds, the treated ones more than twice as long. I shot the JLK 80gr VLD's over 4200fps, and vaporized about one out of three commercial bullets. The only one I could not destroy was the Nosler solid base sixty grainers. 5200+fps and they stayed together. Just under an inch at 300 yards for 5-shots. Shoot the others, and at least one out of three would go 20-30yds and just Poof! like blowing on a dandelion ball. Just a little gray smoke, and no noise.

Rich,

This must have been quite an experiment, but the results are shall we say less than desirable, and some weidos would equate this to driving a Ferrari, weird !!! My experience is that those that often refer to Ferraris either do not own one or has never driven one, but there may be rare exceptions.

Perhaps we should start a thread of Ferraris vs Maserati vs Porch vs whatever. I always find it comical when we talk guns, some on the fringe would bring in cars and what not.



Have a nice day.
Warrior