Good point. My 340 has a break, custom stock/custom build, and I only shoot 200grs (I have shot bigger than that 250s and up to 300grs and then it makes a 7 seem like a 243)
To be fair to the 7s, all the ones I have shot (probably a dozen different or more) were older guns with not the best stock designs as they were probably all 45yrs old now or older ( a Rem 700 or Model 70 from the 60s I'm sure kicks much harder with the same load then say a new Tikka, Howa, custom or newer 700 or 70). Since I have a couple 264s and several 300's, as at least person commented, there's only a small gap going to the 7mm and lil gain, thus I have no need for one. I'm sure you have all probably shot something that kicked pretty hard, but then the stock was changed to a more modern design and the recoil was reduced. Just one man's experience and opinion. If you wanna shoot something that stomps the shooter regardless of stock or build, try a 358 STA or a 505 Gibbs. Course they do that to the receiving end too.