I was digging around in my ammo stash and came across some .223 Black Hills 68 grn moly coated ammo. I seemed like a god thing (the moly coating) back when I bough it years ago but then I remember people saying not to use it. It was hard to clean and it would make your gun not shoot copper jacketed bullets accurate anymore. So whats the truth?

How much do you have?

Not exactly the answer I am looking for.

No truth to the idea that it will do your gun any harm or have any long-term effect on accuracy of the gun.

When you switch from Moly to Copper or vice-versa, you may have some inconsistent velocities of little significance.

Just shoot it.

But don't buy any more. People would still be using it widely if it had any use.

I was deep into it in the 90's.

I even moly-koted my own bullets, and I had a dedicated tumbler for it.

This is what I know FOR SURE about moly. No matter what steps you take to contain it, if you are applying the moly-powder to bullets indoors, enough of the powder will escape to make a real mess inside your house. My wife was pretty pissed when I moly-koted the VCR. And her book collection. And the baby.

Yes.

IdEaLLy you would deep clean any copper out of the bore and devote to moly bullets, fouling in until velocity evens out. Run a chamber brush and solvent patch every 500 rounds or such so that the "equilibrium" isn't disturbed. Deep clean or at least oil the bore if storing rifle for months to mitigate any chance of hydroscoping.

I have not done borescope testing, but bare bullets over moly'd fouling seems better than moly'd bullets over copper fouling. Otherwise just shoot it and account for clean bore/fouling zero offsets like any other ammo.

Ok, thanks for all the info. I have a box of 50. I remember also in the 90's when this stuff was popular. Bought it back when I was shooting service rifle matches and never used it.