First shot ever with a scoped rifle AND off a rest was a 70's era 700 BDL in 30.06 with what I swear was a gutta percha butt pad... not sure if it was better than nothing. I had bought it from my best friend who was shooting a .300 WM with a muzzle brake just next to me. Barest bit of wobble from the rest and bench plus the muzzle blast nearby had me focusing so hard on the target I forgot a good shoulder lock with the first shot.
With my buddy's help I dialed in the scope, firing twice between adjustments just to see if I could hit the same spot twice, moved the target down range, stuck a folded hand towel under my T-shirt and threw another dozen rounds before I realized my shoulder hurt like heck. I was having a good time, only 20 rounds total.
The next day it looked like I had slice of baseball right on the shoulder knob.