If you can use a sabot - Knight has a few .52 caliber Extremes left that are on sale. Those are a decent value. With a gray sabot, you’re launching standard large caliber bullets .452 IIRC. The twist is a little faster on the .52 as well.
Knight 52cal sabots are for .475cal (magenta) and .458 (silver) bullets. There is no option for .452. You can find a few lead conicals for the 52s if you dont mind shooting big lead. Parker sells some that are very expensive and there was a guy on the auction sites selling them too. Great caliber actually if you want to shoot 458s in sabots. The 52cal sabots handle hot loads well.
