I've used the inserts before with success. They can be very usefull for training and small game applications, but I question the mini arsenal logistics for unplanned survival scenarios. If you expect to be in an area of big game, an appropriate centerfire will suffice, or a small caliber for small game. You can fall back on snares and deadfalls for smallgame, but it's tough to take moose this way. When I attended Arctic Survival school, the area had been utilized by so many classes the rabbits, squirrels, ptarmigan etc. had long since relocated to Hawaii. Our Ithaca survival rifles and snares were useless :O(. I however, cheated, with big PX chocolate bars and jerky in my Parka's lining. Survival means controlling your situation, not the reverse!