Has anybody ever taken any sort of target into the backcountry to check their sights while hunting? I'm going on an archery sheep hunt next month and wondering what the best method to check my gear is once I get to base camp and occasionally throughout the hunt to make sure I haven't bumped anything while climbing up and down the mountains. I know in some locations you might be able to find a rotten stump or clump of moss to shoot into, but I'm doubtful I'll be able to find something suitable on the rocky mountain side.
I'll have a practice arrow or two with me, so it won't be the end of the world if they break because I'll still have my hunting arrows, but obviously I'd prefer not to kamakazi my arrows if I can avoid it. I'm thinking maybe a couple blocks of 2" insulation board glued together (say 8"x8"x8") or just fill a small box full of spray foam insulation. It wouldn't stop the arrow dead, but I'm thinking the kinetic energy would be put into 'tossing' the block around instead of driving the arrow into the ground behind the target. Being cheap, lightweight, and flamable (so I can burn in place instead of packing it back out) would be nice as well.
Anybody have any thoughts or experience on the subject?