The indoor range I go to has sign in each booth saying that aluminum or steel case ammo cannot be fired there.
I believe I'd find myself another range.
I live in the area and hate Targetmaster. But French Creek Outfitters outside Phoenixville, PA also bans anything but brass.
I belong to a local private gun club with an indoor and 3 different distance outdoor ranges and trap house which allow you to shoot anything but 50bmg or full auto. Costs $60/year for the whole family.
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They say such casings have burst during firing and are therefore not safe!
It's all a bunch of crap!
There are (at least) 2 issues relating to aluminum and steel casings that seem to come up:
1. Are they US made or foreign? Foreign may not meet SAMMI standards!
2. Handgun vs. rifle cartridges. Some foreign made rifle cartridges with steel casings have been a problem.
I emailed Blazer about their aluminum based cases and they indicate their products meet SAMMI standards and are safe.
I think the REAL problem is how to cheaply separate aluminum from brass without employing people!
For each metal you introduce to a scrap load, the salvage company reduces it's value by some given percentage. Each salvage company has their own multiplier, but as soon as they see any steel or aluminum in that load of brass, their multiplier kicks in.
CCI are so power full the range can't allow them.
Ok nobody wants the worthless casing mixed in with the brass.
"When you hear hoofbeats, think of horses not zebras"