Re: 1st For This Father ????
ditto on Berks. When I started my dad took me out and handed me a 12 ga with high brass and threw a soda can up and said fire! I didn't even have it on my shoulder proper. It darn near knocked me off balance and He laughed (I guess it was funny) Just wasn't a confidence builder.
I frequently start youngins with a 30 grain load in a 50 cal if they are short statured or a 58 if more adult sized. Then after they feel confident 5 or 6 shots, work up to another string with 40 grains and then 50. Frankly, 60 or 70 grains in a lyman GPR doesn't kick much IF IT FITS.
If it doesn't fit him, the recoil is worse. An interesting alternative, would be to buy one of those Lyman GPR stock seconds that Dixon has for sale and cut an inch or two off the butt stock. You already have everything else. When i was there Saturday, he had about ten of them in a bin for sale.