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I know sweet FA about AI only read that there is a speed gain but that may only be with longer barrels I don't know
if you keep at 18 inches with a dpt overbarrel (talking tikka's here) they are 22...

In my opinion theres no need for anything bigger than an 08 case in nz unless your into super long range shooting
An 08 case no matter which one is good to 400-500 yards which for the average...