I had to sign up for this site just to post here. I prob. will be on here a lot now!
Funny, I asked this exact same question and people just kept calling me crazy....

I had 10 guns out on the range, a few small ones along with a 30-06,25-06, 35 Rem, 375 HH mag, 12 with 3 1/2 and a 44 mag.

None were enough. I wanted more. Just like the first post for this. I wanted to turn my shoulder into ground beef. lol....

I did a lot of research on this statement... THat 700 T rex or nitro) cost $20,000 bucks... YUP! No typo.. four zeros. I did see a few for 18k but still! not going to happen.

Acording to other people asking the 12 gauge with a 3 1/2 inch turkey load is one of the best for beating yourself up. According to some chart I found online, it has it listed at 77.75 lbs of "Recoil Energy"

I took it a step further and made my own spreadsheet out on gun recoils. Im not sure where I went wrong, but my #'s are a bit smaller then the chart that I mentioned above... i.e.:
Their chart:
30-06=17.82
7mm Rem mag=19.87
300 win mag=27.16
My chart:
30-06=6
7mm Rem mag=7.87
300 win mag=8.0

Yea, I don't quite have it down all the way yet.. But long story short, According to my want to be paper, I found that the 460 weatherby mag is at 56.17 (the chart that I found online doesn't list that gun) Their chart says other then the 12 gauge the 458 win mag is massive at 69.96 (my calculations are at 23.84 for that one.

I tried using the formula that is in the back of the lyman 48th edition Reloading Handbook.

P.s. I said that all guns weighed 9 lbs and just picked a mid range load from that book for all guns. Don't know how to do shotguns yet but will get them on there too when I get a sec.