Author Topic: Cryogenic (Read 529 times)

Elijah Gunn · « **on:** September 17, 2005, 03:02:18 AM »

As the barrel on the 742 REM heats up from being fired, the shot groups open up. My questions are, would having the barrel cryogenicaly treated reduce this tendancy? Has anyone tried this,and how much of a difference did it make?
Thanks, Mark

NONYA · « **Reply #1 on:** September 17, 2005, 06:20:59 AM »

might make it very brittle. :wink:

760 Nut · « **Reply #2 on:** September 17, 2005, 12:16:19 PM »

Actually crogenics will not make it brittle. When used in conjunction with the heat treat process, it stress relieves steel much more efficiently than conventional drawing or quenching methods. It is most effectively used when trying to increase wear resistance (molds, dies, cutting tools, etc.)

Tempering after the cryogenic process brings the steel back to it's original state of toughness.

Steels used in manufacturing barrels can not be hardened to the point of becoming truly "brittle".

redial · « **Reply #3 on:** September 17, 2005, 12:45:56 PM »

Yes

Yes, I have.

Makes a big difference.

Cryo's one selling point for me is exactly what you're describing - it eliminates "walking". I've had many several (?) barrels frozen and it doesn't improve accuracy, make bores easier to clean or cure bad breath despite all the hype. I does make your barrel thermally stable and for high volume varminters or target shooters, this is critical. For big game rifles, I don't see the point really since it's only going to get hot at the range, never in the field.

And, getting that 742 apart and back together again ... that's beyond me. I'm a much better driver than mechanic, see. :roll:

My two cents - worth every penny!

Redial