Are you allowed to fire military surplus ammo in the range ?

I heard somewhere that because its steel-core its prohibited in the range is that true ?

I don't have any issues firing it at my local ranges.
I would check with the ranges you attend to make sure it is not one of there rules.

Tim

Steel core is bad for most indoor ranges as it will punch through the backstop...

There are signs on the door to the rifle range that say no steel core or jacketed ammo in the range is allowed.
That 7.62 x 39 ammo that you can buy for $199/1120 rounds is steel cored and punches through the backstop. It also causes sparks and once this started a fire in the rifle bay-- almost burned the place down.
Outdoor ranges are usually ok to use this ammo at, but not indoor ones.

do you know anything about the shooting edge ?

The Shooting Edge was the one with the fire.. its a no go at indoor ranges..

Surplus is fine at TSE as long as the bullets aren't steel core.

Use a magnet. If it sticks, the bullets are a no go.

Plenty of American ranges ban steel bullets because supposedly the sparks their ricochets make cause grass fires.

The biggest issue is damage to the (expensive and very important) backstop. As stated, as long as you cannot stick a magnet to your bullets we will let you shoot it in the range.

If you are unsure simply ask any staff member and we'd gladly check your ammo for you.

Steel core or steel jacket? A magnet will pick up either, and you won't know which you have. There are softpoint bullets which use plated steel jackets. Can't see that a steel jacket would be any harder on a backstop than a guilding metal one.