i was wondering if anyone had any input on this idea is it possible?

It is possible and Hollands lists it as a cartridge he chambers for

http://hollandguns.com/

Seems to me that it would be very similar to the Lazzeroni 7mm. I would think you would need a long barrel to take advantage of it and that you would need some very slow powder (and lots of it).

I have been kind of toying with getting a barrel for this cartridge idea as I have a switch barrel rifle with barrels in 338/378 and 460 Weatherby. If anybody has had any experience with it I would be interested in hearing about it.

Maybe you should talk to fritz454. He posted this:

quote:

Originally posted by fritz454:
To complicate things I’ve got a switch barrel on a GMA action I’m just about finished with. This has barrels in 550 Mag, 500 A2, 475 A&M, 460 Wby, 416 Wby, 378 Wby, 358-378 Wby, 338-378 Wby, 30-378 Wby, and 7mm – 378 Wby. The 7mm is out, it is simply too fast and was just a goof that I made one. I had a reamer available so what the heck.

I wonder what in the heck by it was just too fast...?

MD

It is way overbore. I did one just because and Haven't shot it too much. I will tell you that it explodes 140 Nosler BT at about 20 feet from the muzzle. With heavey for cal bullets it would be a flat shooting and wind bucking SOB. I just haven't really messed with it too much as I've been worki0gn up loads for thee bigger cases.

I don't think barrel life will be very good but Pac-Nor had a reamer and I just thought 10 barrels is better than 9.

Mark, too fast refers to the bullets comming apart. I'm sure a TSX or similar mono metal bullets will work fine I just haven't done so yet.

I hope to take it antelope hunting next year and see how it does. I usually go with a 7STW but this one will beat that hands down.

The chrono results were all over the place. I'm guessing that the bullets were already breaking up and it confused the chrono. Same loads whent from 4600 down to 1800 and change.

I think you can get a 175 gr pill to 3600 or so safely but I have yet to do that and is simply a guess. I got a 28" tube and would have a 30" if I was to do it again.

John

quote:

Originally posted by fritz454:
.............

I think you can get a 175 gr pill to 3600 or so safely .........

John

If you decide to get rid of that barrel......

LDO, I think I'll hang on to it at least until I burnt he throat out of it once. Should take 100 or so rounds thru it.

It does heat up really, really fast. It won't touch your 588 project. Well maybe for speed but not for range or hitting power.

BTW when is your tour up? Hope you're home for hunting season to start.

Fritz-
I haven't been hunting since my dad took me as a child. It's just too expensive in Texas. I'm not paying $1500 or up for the chance to shoot a deer.

Hey Fritz small world eh.

What speeds were you running those 140's at and with how long of a tube? Personally it really amazes me that you could blow those 140's up like that. If the bore was really a rough one, I could see it.

I looked a while back about doing this very same project, kind of feel by the way side. It would of been a heck of a chuck rifle though!

Thx

MD

LDO, No shit. 1500$ to hunt deer. Man I need to stop bitching about access here. Getting a deer and antelope is simply a matter of getting off you ass for a few days. Now elk is a different story but you can find some honey holes after a few years of looking.

MD, yea not too many of us in the Bozeman area. Although there were a lot less just a few years ago. I think the secret is out but I keep hopping for a real winter like we had 20 yrs ago or so. I think a couple of months of minus 25 of better should do it plus 2 feet of fresh snow every 5 to 7 days. You know the good old days.

It's a 28": barrel with a faster than normal twist for VLD bullets. I think that is what is making hte 140s break up. When I get some time I'm going to runs some 175s or even heavier. I was thinking in the 220 gr area. I make most of my own bullets these days so I can make whatever weight I want.

Barrel is a Pac-Nor one of their super match grades and is well finished. In fact clenaing was not anyworse than a 7X57s or 257 roberts I've shot.

The Crono didn't give any consistancey at all and so there is noting reliable to report. Hell, it could have been the sun but I think the bullets were already breaking apart.

This one will be sitiing around for awhile as I've got a number of big bore projects to finish up and a couple to start before I get back to this one. I don't even have a well fit stock for this one yet. Just an old POS that I could lock it into for test firing.

Thanks for your time Fritz, 3when get some clock work done let me know. I'm always interested in cat data especially from a 7 of some sort.

When I told my smith I wanted to look into something like this he just laughed, never did answer. He knew i'd teroize the chucks with it.

If I could find an old 30/378 in black anbd plastic for cheap I'd have to give it a thought or two.

Yep a good old winter or a strong string of them would do some wonders.

Thx

MD

quote:

.........
It's a 28": barrel with a faster than normal twist for VLD bullets. I think that is what is making hte 140s break up. When I get some time I'm going to runs some 175s or even heavier. I was thinking in the 220 gr area. I make most of my own bullets these days so I can make whatever weight I want.
.......

Are you talking about 220gr 7mm solids? Geez I'd love to see the ballistic coefficient of a projectile like that. Imagine that with a 36in barrel...... unreal.

If you ARE talking about 220gr 7mm solids, I just gotta buy some from you. Much more affordable and practical than a .588" anything.

quote:

Are you talking about 220gr 7mm solids?

yea that's what I'm thinking. Maybe a hollowpoint for blowup on varmints and such.

Hey Mark, are you a member of the SW MT chapter of SCI? For some reason your name is fimilar. I'm on ht eboard and I think I've seen it somewhere. Then again it could just be from here. Sorry to go off topic.

Anyway, if I do get he 7mm-378 shooting I'll PM you and we can meet at Logan for a shoot if you like.

Fritz

BTW my real name is John McMorrow but don't believe all you may have heard about me only some of it is true

John perhaps I met you at Bob Wards I owrked there the last couple of years. I now work in the Real Estae world (C21 Summit in Boze.

I used to be a bit involved with SCI and I did go to the banquet a couple of weeks ago.

MD

Oh yeah what speeds would you anticipate with a 160?

Could be from BWs. Lately I seem to be heading to YGS in 4corners. I've known Ted the owner for years so I spend my money there. Besides he's a good guy and treats me right. I also know some of the guys at C21. With the market like it is around here business must be good.

BTW How did you like the banquet? I missed it as I was in the hospital but from the reports I got it was a fun night. First one I missed since the chapter started.

Hopefully you were able to pick up a good hunt. There are some we get every year that are just great and they never go for much money
If you are looking for a good one to bid on next year I'll be glad to let you know. Some really good family ones as well.

I picked up the one hunt I've been on for $2700 and it had $2500 in tropny fees included. It was a 7 day hunt but I could only stay for 3 days but managed 4 animals. I would go back again and at those prices what a bargen.

Yeah I like Ted/Chris and Ron good fellas and they've always treated me well.

The banquet was good, I believe fun was had by all.

What do you figure you could get for speed out of a 7/378 with the 160's?

Many thanks

MD

I think 3500 with ease and 3750 or so by going higher with the pressure. A lot depends on the barrel and I wish I had a 30" tube.

I thought about doing one on the 416 Rigby case. You'll get a bit more case capacity which will help and then use a 34" barrel. You may get close to 4000 but barrel life will be counted in the low hundreds. I am doing another switch barrel on the 416 Rigby case soon maybe I'll have to give a 7mm barrel a shot. I'll keep you posted.

You ever want to meet for a beer and to talk guns let me know. I frequent the Mint in Belgrade but there are a lot of good haunts. Could even meet at YGS. I'm going to drop off one of my 600s for Chris to display to the masses. I gave him a case and since then there are a lot of requests to see the rifle.

John