I shoot one in an AR but, I only go up to 68 gr pills in mine.(14 twist) Ican reach 3000fps easy enough with the 68s.
5spd (on this board) has one in a bolt gun and could give you more info.

here is a pdf that is full of info.

http://buckammo.com/Images/6x45_loaddata_1_3.pdf

It is a great round, very accurate, easy to load for and low recoil. Now it is my favorite goto coyote round.

Steve