Warrren Page just rolled over in his grave..243 bullet too light to kill a deer at 300 yards.
My dad used 6mm for deer for years. I don't think it should be used to hunt deer at all. imo.
I know LOTS of people who shoot deer at extended ranges and moose as well with 243's and 6mm Remingtons.
You should really do some reaserch before posting stuff.
Cat