i use a open top box made of 2x8. 24 x 24. faced either side with scrap plywood held on with screws. inside that is two or three layers of corrugated cardboard. it holds just shy of 2 x 5 gal buckets of sand. the lid is a fourth piece of 2x8 held in place by friction (sandwiched between the plywood). in summer, i drop off sand and target at my intended distance to shoot. i fill it there. when finished, i empty it with a coffee can into my buckets and toss all into the back of the truck.
in winter same thing except i fill at the firing point or parking lot and the box is mounted to a cheap plastic sled. i then slide it out to my desired distance.
when the plywood is all shot up, i get a new piece, general off a pallet. the cardboard gets rotated before refilling to keep the sand in.
only thing that has gone thru it was one or two FMJ 7.62 x 39s out of 5 fired at it.
i sift the sand, get my lead and make more balls. probably been using the same-ish pound of lead for a year or more.
the sand also comes in handy in the winter because i can spread it on the walk for traction, or to assist in getting unstuck.
id go take a picture but we are having freezing rain with 110 km+ wind gusts.
