Mike70560:
This photo of Elmer I've had in my files for decades. It may be a reverse image.
I remember in summer camp as a kid and shooting .22s, and the instructor shot his .30-30. We 7-8 year olds thought it was a cannon. You're correct on form and fit and practice. One can get used to recoil. After 6-7 months of no shooting I begin in the spring with a .400 or .500 bpe and gradually work up to the .600 and 4-bore. Now, I've built a shooting shed with a wood stove and shoot every week in the winter. Should have done this long ago.
Cheers, mate.
Cal