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Have some acreage and am wanting to build a backstop that wil STOP rimfire rounds at 25 yard sdistance. Thinking of uprights, then two by lumber in two layers, with sand or small grain gravel 9chipped, rather than round) to fill the space between.
My question:
HOW THICK does that gravel need to be to absolutely STOP the rounds from exiting out the back? No space to build an earth bern. I can work out the hight and width, but the thickness of the gravel "wall" is something I'm needing to know. HOW much gravel thinckness is CERTAIN to stop any rounds from exiting out the back?
My question:
HOW THICK does that gravel need to be to absolutely STOP the rounds from exiting out the back? No space to build an earth bern. I can work out the hight and width, but the thickness of the gravel "wall" is something I'm needing to know. HOW much gravel thinckness is CERTAIN to stop any rounds from exiting out the back?