Re: Information needed for 6x55 Ackley
Performance should be very close to the 6mmRem AI which is saying... very good. Would stick with common brass unless I had a bunch of Swede brass kicking around.
The 243AI is also a barn burner. Just make sure you get a twist rate fast enough to stabilize the heavier bullets for your deer.
The 95 to 105 gr bullets will work well for deer.