Why would CZ have 1x12 twist in a 30/06? I had always thought that a 1x10 was the industry standard...like it apparently is for a 300WMg...no?
Any CZ '06 shooters out there have accuracy problems with 180's or 200's at max velocities?
Will the 1x12 stablize the heavier bullets reliably?
Ron

30-06 1-12 seems to work best with 165's and lighter (my 1-12 Shilen loves 150br NBT's).
Several companies have put out 1-12 30-06's, including Remington (in there 30-06 Varmenter) and Huskavarna?

The reason I ask on this forum is that I asked one of the gunsmiths I use this same question the other day. He dug around and found an old dusty manual from somewhere that showed in '06 that a 1x12 twist was best suited for bullet weights of 170 gr's or under. I thought that was strange and still do. So I'm not surprised at the 165's doing well but heavier bullets may not be as accurate in the CZ or another brand using the 1x12 instead of a 1x10.
Anybody else got an opinion or experience?

Ron

I suppose it depends on what you're going to hunt for the most part. Are you going to be hunting bigger game where you will be using 180+ grain bullets? Or are you going to be shooting mostly under 170 grainers? For bigger bullets the CZ with the 1x12 twist is not going to be ideal.

The problem with twist rates is somewhat inherent in the 30 caliber cartridge. The bullet weights that are common range over an area where there happen to be two different optimal twist rates. One of those things I guess...

I checked a 2004 CZ catalog. Here a few.

30-06 1:12
.308 1:12
.270 1:10
300 Win Mag 1:10
7.62x39 1:9
.223 Rem 1:12
.223 Rem Varmint 1:9
.300 WSM 1:10

My Dad's old Husqvarna 30-06 shot very poorly with 180gr bullets. Somebody suggested I check the twist rate, and sure enough it was 1:12 vice 1:10.

Steve

You might want to confirm the twist rates of any CZ you own; for they also catalog a 9.3x62 with a 9.5:1 twist. Mine isn't, as Bob F. pointed out with his CZ, it is 14:1. Most of the 30/06's I've owned had 10:1 twists and all shot most 180gr bullets very well. Last year I bought a Tikka 30/06 with a 11:1 twist and it shoots 180gr better than all the others I've owned (is it due to trigger, action, or barrel?). Many times an increase or decrease in velocity will allow a slow or fast twist to stabilize a overly long or short bullet IMO. A change to a different brand of bullet can also make a difference due to the bearing surface length, eg. a 180gr Hornady vice a 180gr Barnes X bullet. Mags