Denny from Sniper Pro Shop demonstrates a shooting position at a course for police sniper instructors. Excellent training, I very much recommend it.
The rifle is a Remington 700 with a detachable magazine, the scope is a Leupold (can’t recall what model).
McCann MIRS mount
Doesn’t that concrete block get a bit heavy to carry around ???
Note, please, that he has the stock resting on the support. That works. Resting the barrel on the support will throw your shots every which way.
OTOH if you rest the stock directly on concrete, painted wood, etc. expect to get it scarred up.