I have a Winchester model 88 in 308 Win. I use 150 gr. bullets and I think it is very pleasant to shoot. I think the recoil might be a little more then my 35 Rem and about the same as a 20 ga. pump shotgun. If your shotgun is anything like a Remington 1100 or 11-87 being semi-auto it is going to take away a lot of the recoil. I'd say my friends 1100 kicks about 2/3 of what my Remington 870 does. It really makes a 12 ga. feel like a 20 ga. I have an 11-87 20 ga. and I can't believe how light the recoil is compared to my pump 20 ga.

I would say your 12 ga. is still going to kick a more especially when using the load your using in the 12 ga.