First off, I'am right handed. Not a hunter, just a bench shooter. I'am thinking of another build. ;D Why not build off a "left hand" action? Right handers grip the stock with their right hand. If you build off a left hand action, you could open the bolt with your free left hand while you kept your right hand on the stock and in my case, in the thumb hole.
The new target actions are "right hand" so you still need to remove your right hand from the stock to open the bolt.(even if it ejects or feeds from the left)
I'am not thinking speed, just comfort. The rifle will be held steady with your right hand.
Same thing if you're a lefty. Build off a right hand action so you can operate the bolt with your free hand while you grip the stock with your left.
I've got this stuck in my head and need to get it sorted out. Any opinions? Pro or con? Thanks for any and all input, Mike.