Buffalo Arms has .227/.228's from 45gr to 70gr.
If you do a 25-35 it's Euro name is 6.5x52R and it is a farely popular loading there or was anyway.
Like said above go 219 Zipper with a fast twist as there are a number of heavy .224 bullets out there and it would be so much easier to deal with. It would make the rig so much more versatile and a great selection of bullets.
