which caliber and why I want to build a HV or LV rifle and I can't make up my mind which one to go with i'm leaning twords a 6 dasher but i'm new to the IBS world I've shot only ground hog competitions in PA which was 200-300 & 500meters 5shot per round competitions with a stock sako 22-250 , can anyone please help me I have the ibs rules but i'm not sure about which caliber i'd like to use the rifle for 1000yds competitions I have a 30br that's being built now for 100-200 yard matches thank you in advance for your help