Plan on using my CZ 455 .22lr primarily for bench shooting and I am looking for bench bags. Since there are no good stores near me and I have to order over the net, I can't do a hands-on before buying. Any advice here about the best thing to buy or even make? Right now I am using plastic bags filled with kitty litter and then inserted in cloth bags...ok for a temporary solution, but really not very acceptable as a permanent one! Thanks for any suggestions on brands, dimensions, fill, etc. I am a newbie to bench shooting.