No chiropractor will be required. Do get it snugged up to your shoulder, and use the end of the Alexander forestock to help hold it in your shoulder. Assuming you shoot right handed, let the barrel rest on the web between your left thumb and index finger, then slide your hand to the forestock, You will find the angle of the wood will fill your palm and provide added leverage. Relax and roll with the shot. I put about 75 rounds through my No.1 .416 Rigby per year. Never let it "hurt" you, don't try to shoot all 20 rounds the first day, work up in small increments. As a side note, after you have fired your .416 and hear others talk about the stiff recoil they get from their .300 or .338 mag, try not to laugh.
Reloading is the key for this round. For the price of 3-4 boxes of factory ammo, you could get an Ammo Master press, dies, scale, calipers, case trimmer, 20 pieces of brass, 100 bullets and primers, and 2 lbs of powder. I load mine for about 75 cents a shot, $15 for a box of 20 rounds!
Welcome to the club!
Semper Fi