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The M-11 practically eats everything you feed it. However, like a child, some things it may eat can cause damage.

The M-11 has a relatively thin barrel & relies on a rubber or neoprene buffer to absorb the recoil from the bolt, unlike other firearms. Shooting high-powered ammunition can actually damage your M-11 because the bolt recoils so hard that it can break the welds at the rear of the receiver. Since the barrel is so thin, it might not be able to contain the pressures from hot loads and deform or actually explode.

Stay away from all ammo advertised or marked as +P, +P+, Hirtenberger, or any “plus power” stuff.

With open-bolt models of the M-11 it is also a good idea to stay away from all aluminum (steel is fine) cased ammunition. One brand in particular, CCI Blazer, has a tendency to pre detonate because the weak casing material deforms before it is fully seated in the chamber. With closed bolt guns it seems to run just fine.

Reloads should also be avoided unless you know for a fact that the reloaded ammo you are using was correctly loaded to spec, I wouldn’t take the risk shooting reloaded ammo. Sure you may save $15 by purchasing “Joe Bob’s” special brand, but does saving $15 justify possibly destroying your gun? Of course, it's a different matter if you're a careful and experienced reloader and do it yourself.

Generally the M-11 runs better with Full Metal Jacket (FMJ) ammunition because the nose of a Hollow Point (HP) or Flat Point (FP) bullet doesn’t contact smoothly on the feed ramp. If you want to shoot HP or FP in your M-11 buy a small box first to see if it runs.

In today’s ammo market, shooters have a wide variety of ammo types to choose from. One feature that affects price is what type of casing material is used. Generally there are three types used: brass, steel, & aluminum.

A. Brass – the most reliable & least messy. Brass cased ammo is more expensive than other materials. Brass is also usually reloadable. M-11s eat brass cased ammo just fine.

B. Steel – Cheaper than other casing materials but heavier. Can be a little messy because of the coating put on the ammunition when using it in a hot barrel, though newer steel-cased ammo using polymer coating have almost eliminated problems encountered with previous forms of lubrication. People claim that steel cased ammo will wear out your extractor. This is not true; the steel used in Wolf ammo is a very mild steel. If it is wearing out your extractor then it is poorly heat-treated. Steel cased ammo is not reloadable. Most M-11s eat steel cased ammo without any problems.

C. Aluminum – Cheaper than brass cased ammo and much lighter. The metallurgical properties of aluminum-cased ammo are generally not suitable for open bolt guns. Aluminum cased ammo is not reloadable. There is a risk when shooting this in open bolt M-11s of pre detonation, which can damage the gun.

Federal “American Eagle” – some people report this to be a little underpowered. It runs fine in my M-11

Winchester “White Box” - probably the most used 9mm by subgun shooters. Occasional reports of squib loads, so if your gun suddenly doesn’t cycle check the barrel and make sure its clear before continuing to fire.

Wolf – get the polymer-coated stuff. Great blaster ammo because of price. It is a little dirtier then other brands but seems to work in most M-11s.

UMC – Underpowered
CCI Blazer - Aluminum cases can cause problems

ROF was timed with Pact IV timer using a stock FA SWD M-11/NINE.