Hi all,

I bought a ZKK 600 the other day in 270 Win. I'm not a great fan of the calibre (I am the anti-Jack O'Connor), and the barrel is a bit crap.

I want to have it rebarreled to the latest flavour of the month 9.3 x 62. Now the Hornady and Nosler manuals show that the headsize for 9.3 is slightly smaller than the headsize for 270 / 30-06 / 308 ... etc, but it's not much - one manual says 5 thou the other says 3 thou - is this something to even worry myself about or is it the sort of variation I'd find between consecutive rifles off the same production line?

Thanks in advance - I'm sure I'll get a wealth of good info.

Go ahead and re-barrel.

Your Gunsmith will probably not have to do anything else to the rifle other than headspace the new tube, there's usually no feeding issues, no bolt head size issues - Nada.

If there are any issues a Gunsmith worth his Salt ought to be able to tweak easily.

Have fun with your 9.3x62, good cartridge but then again I appreciate a good 270 Winchester, too.

9.3x62 rim diameter is .470".

Hornady's book is wrong. Although, perhaps not for the brass they make which according to their book seems to be based off the .30-06 case.

Rim diameters are so close, that should not be an issue. However the head IS slightly wider on the 9.3 and, probably more important the shoulder is wider and further forward. That may or may not give feeding problems. You may get lucky or the feed rails and ramp may need tweaking.

If a .277 can't kill it there is a good chance that a .366 will bounce off too.
But I don't know what to recommend. O'Connor didn't use a a 9.3 he jumped to a .416 Rigby.

If it is a ZKK 600 and not a CZ 550 I'd at least shoot it at a target BEFORE I'd pulled the barrel.

I've had a couple of these ZKK 600 rifles...in 270 WCF...and they were BOTH extremely accurate! You may just be quite surprised!

FWIW I don't like the 270 WCF in it's O'Connor "loading" either! I use a 150 grain Speer or Hornandy bullet out of mine at about 2,700fps.

A sort of 280 Remington "lite" if you will.

We used to resize 30.06 cases into 9.3x62 for a couple of my German friends Mannlicher rifles (one old and one new model) and didn't have any problems at all, just sized in the 9.3 FL die loaded and shot. What minor differences there may be don't seem to matter.

quote:

Originally posted by enfieldspares:
If it is a ZKK 600 and not a CZ 550 I'd at least shoot it at a target BEFORE I'd pulled the barrel.

I've had a couple of these ZKK 600 rifles...in 270 WCF...and they were BOTH extremely accurate! You may just be quite surprised!

FWIW I don't like the 270 WCF in it's O'Connor "loading" either! I use a 150 grain Speer or Hornandy bullet out of mine at about 2,700fps.

A sort of 280 Remington "lite" if you will.

Got nothing really against the 270 - just am not excited by it.

The action is from the 70's and has the integral peep sight on the rear bridge, which would be quite spiffy as an open sight on a 9.3 - not so useful on a 270.

I also thought of a 280 (actually I thought of a 7x64), but I already have a 7x57, so decided 9.3 it would be depending on availability - maybe a Whelen or 338-06, but 9.3 if I had my druthers.

Thank you all for the advice, I'm not going to worry about it any more ...

quote:

Originally posted by Bren7X64:
so decided 9.3 it would be depending on availability - maybe a Whelen or 338-06, but 9.3 if I had my druthers.

It would make a superb 9,3x62. That would be my choice.