I'm looking to re-barrel my 22-250, only because of the 1-14 twist. I'm looking for accuracy foremost. Parameters are short action, 300 yards with most often less, magazine fed, velocity for minimal drop, enough sectional density for whitetails and preferably a short barrel (20 to 22in) for manuverability in tree stands. I'm thinking 6mm-250imp (6mm International). I'm a little concerned about the velocity out of such a short barrel. Without trying to start a debate the intended purpose would be for head/upper neck shots on does but with the ability to take out a shoulder if nessesary. All of the other cartridges I was considering require long barrels like the 6-284 or 224TTH and the benchrest rounds do not feed well. I may just have to get the longer barrel. Give me some suggestions please.