09-20-2006, 04:00 PM
Join Date: Jul 2006
The c.m. barrels shoot just as well. We don't see a difference in accuracy. I haven't shot one as a short range bench gun. But have used them on service rifles and an f-class rifles and don't see any difference in accuracy. We lean towards them lasting longer because they seem to be more abrasion resistant than the s.s. the hardness of the material being approx. the same. They do seem to machine a little harder/more finesse needed with the chamber reamer etc... but nothing out of the ordinary. Start with your same speeds and feeds like you would with s.s. The chrome moly might take a little bit longer to break in (throat area of the chamber is about all you really break in) again because they seem to more abrasion resistant.
The c.m. seems to have more affinity for the copper or it seems like you can see the copper easier. I compare it to like taking white chalk and writing on a black board and taking the same chalk and writing on the side walk. The copper seems to stand out more in a c.m. barrel than a s.s. that's all I'm trying to say here.
When I started shooting hi-power rifle I heard you have to get a s.s. barrel because they last about a 1000rds. longer than a c.m. barrel. No truth to it. Back when we we're at Krieger we made a couple of dozen service rifle barrels in c.m. (for ar15 service rifles) for Lackland Airforce Base. One of the armorers (don't know if I spelled that right) called me up and asked how long should these barrels last? I asked him if there was a problem? He said no. All of them had just shy of 10,000rds on them and we're all still shooting very well. I told him I would get more barrels in the works and that they wouldn't last to much longer.
Just talked to a customer last week shooting one of our barrels on a ar15 match rifle. The barrel is in s.s. and has 9400rds. on it and it shoots as good as his Krieger which has 3500rds. on it.
From what I've learned especially for a service rifle where you have a flashhider and in cases like with a M14/M1A where you have to enter the cleaning rod from the muzzle end the c.m. barrels seem to stand up to cleaning better than the s.s. (damage to the crown end of the barrel). I would lean towards having a c.m. barrel on my service rifle than a s.s.
I'm not comparing hi-power rifle accuracy to benchrest accuracy here. The requirment that a benchrest shooter wants to see is different from a hipower shooter. I'm just trying to give you feed back on things that I've seen and have learned overtime.
The major down side to a c.m. barrel for most people is it requires more maintence than a s.s. barrel. Getting it blued or parkerized (some type of finish on it because it will rust easier than s.s.). S.S. can still pit/get corrosion on it/to it so you should still take care of it but it is more resistant than the c.m.