I'm shooting a 22-250 Improved. The performance is pretty much identical to the Swift. Both gain a little bit of extra speed over 22-250. This isn't better or worse... It's just different.
The thing that put me off of 22-250 was the amount of case taper and the shallow shoulder angles. I think the swift is similar. Keep an eye on case length as you reload, as it'll stretch a fair bit.
They'll all make wallabies extremely dead. The sheer amount of shock from such high speed impacts makes them highly emphatic on such small game.
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