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I've shot moly for about 3300 rounds now. If you load 2 cartridge, one with a molycoated bullet and one with a non-coated bullet, you will supposedly see that the mk bullet is slower out of the barrel (I haven't seen that in my rifle FWIW). Pressure of the mk cartridge should be lower.
If you jack up the powder charge, you can get back to your initial velocity, but should have a lower pressure. This in theory would make the barrel last longer. Since one barrel will wear out sooner than another, and "worn-out" is a very subjective call, it is my opinion that any increase in barrel life due to mk would be totally lost in the noise--not something you can see or measure.
The only good thing about mk that I've seen is that it shoots accurately longer between cleanings and makes cleaning a little easier. I'm shooting up the last of my mk bullets and am not buying anymore.
If you shoot mk bullets, make sure to get oil in the barrel ASAP after you're done firing. I'm pretty convinced that it will accelerate pitting.
Ty
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