The lightweight WR loads are easy on the shoulder, the higher payload ones - in 12 bore at least - are a bit stiff. I believe they are made by Lyalvale for them. I like them and use them in my 12 and esp 16 bores.
I think this recent low pressure stuff is overdone. If the load is the proper length and within the proof pressure of the gun and the gun is sound, there is no mechanical issue. I'd be more concerned about how the load patterns for the quarry and whether or not your gun fits you. If it does it will be comfortable to shoot.
