I have a CZ550 in .375 H&H. I would like to rechamber to .375 Rem. Ultra Mag. Is it possible?

Thanks

1: YESS
2: Why?

Jeffe

Tongo
If you just have to have a litle more velocity you could "improve" the 375 or rechamber to 375 Weatherby.

But like Jeffeosso... WHY?

I went and shot my CZ .375 H&H yesterday with PMC 300 grain Barnes X's. (I bought 3 boxes for $20 each. Beat that!) (I posted pictures a month or so ago of the re-shaped stock, re-blue, etc. under the thread JudgeG's New Toy.) CLICK HERE

The rifle has no appreciable recoil, is extremely accurate, utterly dependable, holds 5 down and one in the chamber.

Like other posters, I can't figure why I would need more velocity, and if I did, there are always 270 grain bullets... but that's just MHO.

I like what one poster states in his signature, "One planet, one rifle." So I'm selling all my other ones.... NOT!!! But the .375 H&H can hardly be "improved".

[ 06-23-2003, 00:50: Message edited by: JudgeG ]

Not sure about the dimensions of the 375 ultramag but it sounds like it is a little bigger than the H&H so it should be relatively easy to rechamber.

If you are gonna do a rechambering job, then why not rechamber it all the way to the 378 Weatherby and then load it up and down accordingly?

Have fun deciding!

Tongo,

The only comment is that to much velocity in a DG rifle is not what you want...For you want to grind him down by absorbing all of the energy from the bullet...but if you are just looking for velocity then a RUM or 378 is the way to go...Or drop to a smaller diameter...
How much velocity do you want???

Mike

Freedom is not Free

I agree if you want more than a .375 go staright to the .378 Weatherby why buggarise around with a couple hundred fps.

At the same token I have found the .375 H&H to be flat shooting enough and recoil is pleasant and they also kill very well. I am overall pretty wrapt with my cz .375 so much so that I wish I could afford a second one

As everybody seems to wonder... Why???

The .375 H&H is an excellent round as it is.

Energy doesn't kill, holes do. Ever seen what happen when you put a "just-in-case" shot on a presumably dead critter? Just a slight shudder, almost nothing. That's all what wonderful energy (on paper) can do.

Got 3 CZ at the moment. The one I rechambered was from .375 to .458 Lott (changed the barrel, that was at the time they did not have a .458). But my good ol' .375 never felt like it needed anything more.

Put a long deep hole at the proper place, and you won't ever have a critter suing you for using a non-extra-plus-hyper-Magnum...

Good hunt!

Thanks for the advice.

I have two .375 H&H rifles and rechambering one to .375 RUM would be a just because project.

I agree .375 H&H is just fine as is.

It should not be a problem at all to rechamber to a .375 RUM. assuming the twist is the same for the RUM and the .375 H&H it should stabilize the faster bullets. All it should take is some rail work and ramp polishing. I didn't look at the dimensions, but if memory serves the chamber should clean up completely. Make sure the work is done by someone with a good machining background and proper equipment as the reamer will be unsupported initially and you don't want an egg-shaped chamber. Talk to John Ricks! I would not reccomend a .378 WBY to be made from a CZ550 in .375, because you will need to have the boltface opened,the extractor modified as well as the mag box,Ramp and rails extensively modified. A .416 Rigby CZ550 action is a better choice for that one.-Rob

I have both a .375 RUM and a 378 Weatherby that were made from CZ 550 .375 H&H actions.

The 378 Weatherby has the original CZ factory barrel rechambered from .375 H&H, 25" long.

The 375 RUM has a Winchester M70 Super Express barrel cut off one inch and rethreaded and chambered. 23" long.

With enough work you can get them to feed.

I am currently having a 45 Lapua done on a CZ 550 action that started out as a .416 Rigby. It feeds the 45 Lapua great from the get go.

BTW, Rob is right about the .375 RUM cleaning up a .375 H&H chamber, assuming the original .375 H&H chamber is good, as they always have been in my experience with CZ. A straight rechamber to .375 RUM should be fine, but only if you have at least one other good .375 H&H on hand to leave unaltered. Everybody ought to keep a pair of black shoes on hand.