Most cost-effective solution is a berm of soil, used the world over. hire a dozer and scrape up a decent mound. Then either grow grass on it or have it substantial enough that it won't erode too much. You can put horticultural erosion mats on it but they cost money. Private ranges do not get the hammering that public ranges do.
If space is an issue then a vertical wall of something to hold soil. I have seen wood, industrial tubs and tyres filled with sand. I recommend whatever structure you build then you must fill it with sand/soil. Sand is an amazing absorber of bullet energy. I have seen a pile of single un-filled tyres shot through and the rounds skipped up the slow gradient hill behind to land in the neighbouring farmers car-port (both an amazing coincidence and very untidy).
I have also seen layers of compressed straw building material used with a steel backing. Three layers of this commerical product absorbing enough of the energy that the steel is not overly stressed. The Stramit product was replaced from time to time.
One unusual solution is to use right-angled rubber lamels (as in lamella armour). In this case two layers of discarded conveyor belt rubber hung in overlapping vertical strips at 90 degrees to each other in an indoor range. Behind the two layers is a concrete wall where by then the rounds have run out of steam, hit the the wall and fall to the ground for future collection. Works for any angle the round impacts the wall. If you always shoot in one direction like a classic rifle range then a single layer of angled overlapping lamels would work. Obviously less relevant in your case but an interesting idea.
360degree Indoor Range with Rubber Lamella as the Backstop
![[Image: Lamels_zps53b455f7.jpg]](http://i906.photobucket.com/albums/ac262/Klemheist/Lamels_zps53b455f7.jpg)
If space is an issue then a vertical wall of something to hold soil. I have seen wood, industrial tubs and tyres filled with sand. I recommend whatever structure you build then you must fill it with sand/soil. Sand is an amazing absorber of bullet energy. I have seen a pile of single un-filled tyres shot through and the rounds skipped up the slow gradient hill behind to land in the neighbouring farmers car-port (both an amazing coincidence and very untidy).
I have also seen layers of compressed straw building material used with a steel backing. Three layers of this commerical product absorbing enough of the energy that the steel is not overly stressed. The Stramit product was replaced from time to time.
One unusual solution is to use right-angled rubber lamels (as in lamella armour). In this case two layers of discarded conveyor belt rubber hung in overlapping vertical strips at 90 degrees to each other in an indoor range. Behind the two layers is a concrete wall where by then the rounds have run out of steam, hit the the wall and fall to the ground for future collection. Works for any angle the round impacts the wall. If you always shoot in one direction like a classic rifle range then a single layer of angled overlapping lamels would work. Obviously less relevant in your case but an interesting idea.
360degree Indoor Range with Rubber Lamella as the Backstop