I would say it is an order of magnitude more difficult to shoot a decent group with a lightweight hunting style rifle from a field position than it is for a serious competition rifle in any of the above sports. That is, a guy who can put a 10-shot group in the 10-ring at 300yds in 70-seconds with an iron sighted AR-15 using a coat and sling will have trouble hitting the vital area of a deer target at that distance more than half the time firing slowly 1 shot at a time using a hunting rifle resting on sticks or a backpack.
You would be wrong, laughably so. A competitive Service Rifle shooter has to shoot 9 ring (13in) or better OFFHAND at 200yd with irons and a 4.5# trigger. The best shooters, like Bernosky, are cleaning a 7in target at 200yd OFFHAND.
A shooting coat adds about 20% to a good shooters score. It helps but it ain't a quantum leap like you're pretending.
