Ayr-56-ap.

[John D.Kopke]

Gentlemen;
I must concede my ignorance and ask this Board for information on AYR-56-AP.
Is it corrosive ?
Is it Boxer Primed?
Is it Brass Cased?
How many Grains is the Bullet?
Thank You for any information you may have.
john (USCG 1961-1967).

[JBinIll]

From information posted on the CMP Forums it is non-corrosive and Berdan primed,brass cased.

[Twinson]

Two weeks ago I pulled the bullet and powder from an AYR 55 M2-AP case. I then cut the case head off, flipped it upside down on my steel vise. (I cleaned a spot down to bare metal first). I fired the cut off case and two weeks later there is still no rust on that spot where the cut off case was fired... Jim

[carolinashooter]

Twinson has found out the same thing that everyone else has found out (including me). This ammo has non-corrosive primers. I did the same test basically but added a known non-corrosive as well as a known corrosive to compare. Ammo is brass cased and berdan primed. This is from observation, not someone's posting. I have tons of this stuff and it has all been sure fire. There has been a small amount that had some corrosion at the case neck area (maybe 2-3%). Other than that I have not seen any problems.