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.408 Case Holder used for priming

For big cartridges like that (> .338LM) I used a press-mounted priming arm (RCBS AmmoMaster 2 and Lyman something or other). Now I'm quite a bit more finicky and use a K&M hand priming tool, but I couldn't find a Lee shellholder for the .408 case, so stuck with the priming arm on the press for that.
 
21st century shooting, SS priming tool has shellholders for the 505 Gibbs, shellholder 450.
How it is to seat with a 408 case i have no idea about thouh, my cases are all a good deal smaller.
As for sensitivity and feel you will not find a better priming tool anywhere.