Lets not forget the OP's range is 300-500 yards. More powder shines at more distance.
Yes I will not be shooting past 500 and on game will get as close as possible so that number will probably never be reached there, just want more umph than a 7mm-08 has at that range with heavy 7mm bullets.
Yes I know there isn't alot of difference in practical applications for the ones I listed but when it comes to these three chamberings I only know what I have read and you guys know the real info from shooting them
Thanks again