hey, i've been doing a lot of shooting with my .243 win this summer. getting pretty comfortable out to 500 meters, and i'm going to try to stretch it out some more. i was wanting to know what is the max effective range of the .243 win on whitetails? i'm shooting 100gr sierra game king boat tails. is there a better long range hunting bullet for this setup? im shooting a savage, 22 in bbl 9.25" twist. the 100gr sierra game king boat tails are shooting plenty accurate for deer at that range i think. so how far can i effectively kill deer with it? thanks!