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.