depending on which one then yes, lanber ect are i believe on a 12g frame, the idea of a 20 is a lighter gun yet i see people using 34g carts, kinda defeats the object
I've seen that a lot Paulus then they moan cos they've got sore shoulder, muppets!
I started on a 12G (Lanber Sporter, it was light mounting a fence stab to my shoulder lol), went on to a 20G (Browning Citori) and then back onto a 12G again (Lincoln Premier Gold, fab gun) which is actually lighter than the 20 I had lol.
But yes the fact the 20 cartridges are dearer irritated me and also by going back to a 12G I can