I responded to this conversation eleven years ago when I owned neither a Ma-Na-Ported rifle, nor a 9.3 x 62. But I did own a CZ550 in .458 Win Mag.
Eight years ago I bought a TIKKA T3 Lite in 9.3 x 62. It weighed 6.7 lbs without scope or ammo. Today, it weighs 7.7 lbs fully loaded with four cartridges and a 3-9x40mm scope.
Recoil isn't merely a matter of what particular cartridge a rifle is chambered for, but there's a great difference in how one may load it, if a handloader. Mild loads can give rather mild recoil effect. But hot loads with a heavy bullet can transform it into the equivalent of a .458 Win Mag with mild factory loads. How do I know that? Just ask me!
I loaded my CZ550 to equivalent Lott loads just by seating the bullets "long". Those bullets were 500s at 2200 fps, and some well beyond that! 350s were leaving at well over 2700 fps!
Today, I have a Ma-Na-Ported Ruger Tropical No.1 in .458 Win Mag. Loads are approximately the same, but recoil isn't. It weighs about 1-lb less than the CZ with one in the chamber and four on the stock, and with a 2-7x32mm scope. But recoil is reduced by about 15%, plus muzzle jump is greatly reduced. And, I don't notice a greater muzzle blast when woods hunting without muffs.
My TIKKA Lite in 9.3x 62 is easily the equivalent of a .375 H&H in ballistics when using RL-17 behind a 286 NP or 320gr Woodleigh at over 2400 fps. At a mere 7.7 lbs it has a healthy 50 to 52 ft-lbs free recoil.
I've shot a lot of heavy stuff over the years, including "hot" .45-70s in a #1 Ruger, and recoil is only a relative thing. It mostly depends on what you habitually shoot -- if a .243 Win, then a 9.3 x 62 might be troublesome no matter the stock.
I've owned and used 8 different .300 Win Mags loaded "hot" and they seemed mild by comparison to some others. Also. a .300 Wby and a .308 Norma Mag, two .338 Win Mags, three .375 H&Hs and three .458 Win Mags, plus a bunch of .45-70s and some other mediums.
Today, I'm closer to 84 than 83 and weigh a mere 162 lbs, just so you know.
Bob
www.bigbores.ca