Plus one vote for the 17 fireball - so much fun, does not heat up a barrel, can spot your shots through the scope.
Red mist factor is high
Downsides might be, converting brass (221 FB lapua), or trying to find brass. Factory ammo is limited to one run a year (usually).
Of course it might be hard to find a 17 fireball rifle. There are always a few on gunbroker, average price is anywhere from $800 and up.
Some guys have been enjoying buying a cz 527 fireball and rebarrelling it.
