Have a CZ 527 in 223 that my son uses, sweet, accurate rifle, as long as you don't put more than 3 rounds in the mag. Went fallow deer hunting, the 223 will kill, but not really reliably. I use a 270, but that's a bit heavy, both weight wise and recoil wise for the boy, an had the thought of necking the 223 case up to 6mm or 257. Anyone done this? What were the results? thought I could rebarrel the CZ instead of buying a whole new gun. Thanks.

There are a number of 6 mm or 257 wildcats around based on the 222, 223, or 222 mag case. Off the top of my head a few that come to mind are the 6x45, 6x47, 6mm TCU, 25 Copperhead, and others that would do what you are interested in. There are also 6.5mm and 7mm versions to consider, but they won't be quite as flat shooting as the 6mm or 257 versions.

I recently got a CZ 527 Carbine in 7.62x39 that is very accurate, and has mild recoil. This may be another alternative worth considering, as it is in the 30-30 power and trajectory range.

Good luck,
Jim

I think that the 6mm on the 223 has been done. I believe it was all the rage for a short time in the bench rest world.
I had thought about doing something similar using a .257 on the 223 case, with a fast twist 1-9 or 1-8 and using heavy cast bullets.
Jim

6 X 45 on the 223 case, 6 x 47 on the 222 Rem Mag case. Lot's of data in the Wolfe wildcat books. There is also a 25 on these little cases. - Dan

My 25-223 (not improved version) does very well in a rebarreled Rem 700. Primarily I use 72-75 gr bullets , but have tried 85 Nos BT and Sierra 100's.
With RL7 the 75's will go 3000fps. Using RL12, the 85's make it 2850, and the 100's around 2450fps (gotta find replacement for RL12!).
Very efficient cartridge.

The 7mm TCU will probably be the most popular of these out there due to it's heavy use in benchrest shooting. Using a 140 grain nosler ballistic-tip it has ample range for any young shooter and the BTs expand well. A 6.5mm TCU will work well with 120 grainers.

The 6mm on a 223 is called a 6 x 45 in some venacular. It is an excellent round, cases are readily available. With an 80 grain Softpoint, which is also readily available, at least stateside( I buy winchesters in bulk from midway).

It can obtain velocities in the 3000 fps range with H 380, Rl 15, IMR 4895, H 4895 ( which is made in Australia) IMR 3031, IMR 4064. That is 3-400 fps behind a 243 with that bullet, but it only gives up about 50 yds in point blank range.

It gives a lot less recoil, and is very economical to shoot. That translates to me, more shooting practice with it.

On a CZ action, that would be a sweet gun.

I built my 6x45 a number of years ago..It is on a Sako L-461 round top action..It is a miniture African rifle by design, with a 18 inch barrel it weighs 4-3/4 pounds, the stock is a wonderfull piece of full fiddle fire red claro that was hard as woodpecker lips...It shoots a 75 gr. Barnes X bullet at 2950 FPS with a dose of H335 into a 1/2 inch group quite often and never over an inch. The late Tony Barnes made me a M-70 3 pos safty for it out of a piece of bull barrel....With a 60 gr. Sierra or 70 gr. Balistic tip it will shoot 1/4 inch most of the time...

My 12 year old grandson only yesterday shot his deer with this gun and it broke both shoulder and exited killing the deer almost immediately, say a 10 yard walk after the hit....I have shot a number of deer and Antelope, plus a bunch of culled African plainsgame with it...and thats about what I have come to expect with it....Barnes no longer makes the 75 gr. but there are some other bullet available in those weights...

The only downside of these 6mm rifles is they don't generally leave a good blood trail, if any, and they should be regulated to use in wide open country....

Thanks folks, from the responses, I'm beginning to question why I carry my 270! (just kidding). Sounds as though the 6x45 might be the way to go! Most of the country we hunt is reasonably open, but close to woods - maybe we could keep doing our 'partner' strategy - he shoots, if it don't drop, dad backs up with the 270. At least the 6mm would be more likely to drop 'em than the 223.

Used properly the 6x45 is a great little deer rifle or for game to 300 pounds...but you must modify your hunting style to fit it, place shots precisly and keep shots within 200 yards I would say....It is no .270 thats for sure.

Get yourself a bolt gun in 250 Savage and either shoot Remington's 100 gr. Core Lokt offering or Winchester's 100gr. Silver Tip ammo. Put a 1" Decelerator pad on the PROPER LOP for your son and be done with it.

The recoil is very managable and I promise you it'll leave a helluva lot more blood trail than any 75gr. 6mm bullet.

Good Luck.

I shoot both the 250 savage and the 6x45 and I agree 100% with Clearwater..you can even load the 250 Savage down or shoot 87 gr. bullets and it is still the better deer rifle...

As much as I like the 6x45, and as successful as its been with me and my family, its still borderline deer and requires perfect placement under ideal conditions...the 250 is the hammer of thor on deer without excessive recoil.