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dromia wrote:The issue here is poor maintenance over time and use rather than the penetrative ability of a cast boolit round on its own.

This. It's not hard to do a weekly check of your backdrop, adjusting the frequency of inspection depending on how much lead is being slung. Sometimes people don't listen and use jacketed rounds which cause much more damage than lead ever could. Spot checks are better than waiting for the perforation to happen.

For some ranges it does seem to be hard to do.

Our range, linotex and back stop is checked every time a duty officer signs on the range.

RCO's will also check as part of ensuring they are running a safe range.