I have a Professional in 9.3x62 and the stock design is the one that fits me best for offhand shooting and does well from the bench.
I have a Steyr "Professional" in 6.5x57. Like you, the stock fits me to a Tee for off hand use. And the rifle is amazingly accurate. I should probably get it out and shoot it this year... Fantastic rifle! I had every intent on building a rifle in 9x3x64, but at my age, I don't think I'll bother... I have dies, brass and a Lothar-Walther barrel blank... GH