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Mike1951 wrote:Steel cased Monarch is made by Barnaul.

From the Barnaul web page:

Superior Quality & Reliability
Russia's premier ammunition manufacturer has over 100 years of experience in ammunition excellence. All Barnaul Ammunition are non-corrosive, new production and use environmentally safe primers.

Mine was brass-cased and said it was made in Serbia.

EDIT: looking this up further, it looks like the ammo was made by Prvi Partizan. The marking on the casings confirms this. I was not able to find anything on the Prvi Partizan site as to whether their ammo is corrosive or not, but I could not find anything to confirm that it is corrosive, either. Aim Surplus claims that all of their Prvi Partizan ammo is non-corrosive.

Mike1951 wrote:I doubt seriously that Monarch is corrosive.

However, assuming he was correct, the cleaning after corrosive ammo involves patches and wiping with a roughly 50/50 water/ammonia mix.

You're probably not doing that as part of your cleaning.

I'll see if I can find anything definitive on Monarch being corrosive.

Let me know what you find.

I'm familiar with shooting corrosive ammo - I run nothing but corrosive milsurp through my Mosin-Nagant rifles. A liberal dose of Break-Free CLP for cleaning will accomplish the same goal.

I shot off a couple of boxes of monarch brass-cased ammo yesterday. It fed just fine through my Hi-Power, and I didn't find any cosmetic faults with it.

After I shot it, a very experienced shooter friend informed me that Monarch was corrosive. This didn't cause concern for me in this situation as I was cleaning my gun immediately after my shooting session anyway, but it is something to keep in mind for the future. I'll probably go with WWB or S&B for cheap plinking ammo in the future, simply because I don't want something like corrosive ammo degrading the crisp rifling and shiny bore of my pretty new pistol.