Would a 7mm bullet (probably 120Gr) in a 222R or a 5.6x50R case create too much pressure in a Martini Cadet action? I'm looking for some sort of 7mm rimmed cartridge for a Martini to make a matched pair of rifles...the Martini and a Lee Enfield in 7x57 rimmed. I know there is a 7x50R, but I'm looking for something with readily available brass.

Roger

I have a martini in 7x30 waters. Pressures are kept reasonable as you know the extraction on a martini is not great.

If you have the thick walled version there have been plenty chambered for the 223 family, I have been thinking along the same lines only a 6.5 on the 5.6x50r case. Too bad they are so expensive,should be similar to the 6.5 TCU.

Greg

try to stick with a rimmed case. fitting a snapps extractor to handle rimless is quite a chore

Do a 25-35 !!! No pressure or brass problem there if you hand load. roger

The 7-30 was my first choice, the 25-35 was in there too but I want to make a matching pair of 7mm's. I'm not looking for more power, actually I'm looking for less, if that makes sense? I have the Lee in 7x57R,now I want a little cartridge to go with it, also in 7mm, so I'm thinking 7mm/222 rimmed or has anyone done something like a 7mm-30 Herrett ?

Roger

i have a 219 donaldson in a martini & that 30/30 case is really maxed out. If you scope the gun loading/unloading is a pain

Not rimmed, but maybe a 7mm TCU. I have a set of dies.

quote:

Originally posted by theback40:
I have a martini in 7x30 waters. Pressures are kept reasonable as you know the extraction on a martini is not great.

7-30 Waters was my first thought here too.

Hello - the action is plenty strong enough in any variation, the real limiting factor is the barrel shank, which is quite small.

So for your purposes think of chamberings with a modest base diameter, the rimmed 222 family as suggested being ideal. Rimmed 222 shares its base/rim dimensions with the 357 Mag, so something based on the 256 Mag might also be around and possible.

Great Project, please do tell us what you decide !!

Perhaps a 7mm based upon the .357 Max case?

I have a thick-wall cadet in 7-30 Waters and it makes a nice compact easy to shoot rifle. I have a 2x7 Leupold compact in high rings on it and ease of loading/unloading is not an issue.

Mr. Brown of eabco.com has a cute little single shot rifle. Point is that he has developed a series of calibers for that rifle working with the H. Donaldson thinking. Harvey D started with the .30/30 case to make the .219 Don Wasp. He did a series, parallel, on the .225 Winchester case for the rim and called them the "ACE" series. Mr. B has a 6mm, .22, and 6.5. I suppose he could do a 7mm, like a Waters Imp. More "grist for the mill" so to speak. Luck. Happy Holidays. Happy Trails.

consider necking a 32-20 down, or perhaps a 357 Maximum case...?

A 7 Maximum would be real nifty can killer.

32-20's too small and 357Max are hard to get out here.......anyone ever necked a 30 Herrett down to 7mm? Short and fat would work in this situation. I've made up a dummy 7x222 rimmed but it doesnt look big enough to push a 7mm.......anyone done anything with a 7x222 ?

Roger

...... after going through "Cartridges of the World" for about the 1200th time, it appears as if the 7mm-222 is pretty much the same as a 7mm Super Mag.....222=357Max case.....more or less.....anyone use one on small game as well as metallic silouette ?

Roger

Perhaps a 7 shooting times easterner. It carries a Little more punch tan the 7-30 waters, and the pressure is not steep. Happy hunting

I have a 7x30 Waters AI reamer and the only rifle was built on a Martini, worked great.

7mm-222 would be very much the same as the 7mm TCU because the TCU is based on the .223. You mentioned using the .222R case so why not use that case and make it 7mm TCU rimmed? The chamber could be cut for a rimmed version of standard 7mm TCU and you could fireform the brass from 222R. Standard 7mm TCU reloading dies would probably work along with a case holder for .222R. 7mm TCU loading data is readily available and the cartridge has a reputation for excellent accuracy.

how bout necking down a 7.62x39 to 7mm

.....really need to stick with the rimmed cases in the Martini's.....I think the 7mm/222R is the way to go.

Roger

......with a bit of help from a member of this forum, and Quick Load, I've made a dummy round to check for feeding room in the Martini action......




....basically a 30 Herrett necked down to 7mm, next to the 7x57Rimmed that I've already converted my MkI Enfield to....flanked by a standard 30-30 and 303 British.....

Should get about 2200 fps with 120 grainers, probably more with 100's, now to fit barrel and start testing .......hopefully not too much pressure.....

Roger

How about the factory 7x33 SAKO? And Bertram makes 7x33 brass!

Or something using a .44 Magnum case necked down. Like a .357/.44 Bain and Davis? Except, of course, necked down to 7mm?

Personally I dont like the short neck of the thing. I'd "do" a .357 Maximum necked down and trimmed. Like others have already suggested.

Bob Snapp, who was the dean of custom rifles on the Martini Cadet action, built one in 7x30 Waters as his personal deer rifle. Given his skills and his experience, I think that a most definitive recommendation.

......as previously stated, 357 max case are difficult to get here,7x33 is rimless..... and how many split neck 30-30 cases are thrown away ??
The 7-30 Waters is a good choice, I'm doing one of them in a 64/94 winchester, also I was after a smaller case for the Martini.

Roger

P.S. The 357 Max necked down to 7mm is called a 7mm Super Magnum....very short neck....look it up

I have absolutely no issue with my 7x30 Waters Martini Cadet and I would think the parent .30-30 brass would be available world-wide.

I totally agree loud-n-boomer, thats why I chose the 30-30 case, they're like arseholes, everyones got one, and all my mates give me their split neck cases, so no cost there.I turned up a file and trim die on the lathe, so no cost there.
I like small cases in the Martini's, I have three at the moment, one in 32-40 BP, one in .22 Mach IV rimmed( I turned all of my 222 rimmed cases into 17 Mach IV at one time, didn't like it so blew them back out to .22 ) and now this one in 7-30 Herrett ( good name ?? )

Roger

I love the 7mm "Herrett" idea.
Case capacity is not unlike the 7mm TCU.

Keep us posted on the development.


Any reason other than rimless case that you have not considered 7mm TCU?
I do not know about there, but 223 brass is everywhere.

The late Tony Barnes and grip maker Steve Herrett, used the 30 Remington case shortened to fit the L461 Sako action. The were thumb hole pistols and beautiful guns made by Tony Barnes...They were exactly what your looking for, but 30 Rem brass may be hard to find these days, but you could do the same thing by shortening the 30-30 case and blowning out the shoulder for your MARTINI..