Has any one got them and how are they and will they fit on a heavy barrell tapper

There is a forearm for the heavy barrel and they work just fine. The grip absorbs the recoil quite well!

270 W/ heavy tapper.

I have the Pach's on my Encore. I shoot 257 Roberts and 35 Remington. Neither are heavy recoilers but the grip is very comfortable. The forend is a little longer which is a plus also.

Ended picking one up going to try it on my 378GNR and 8mmGNR barrels to see how it works. Will let you know.

I have both the gripper and smooth styles. I do not care for the gripper style. They feel too "blocky" for me. This is related to the Contender grips only. I have the gripper style one of my wheel guns and I like them.
It is what ever works and fits you best.
Rick

do the sling studs come with the encore set or are they extra??

They come with them. They also can come off. I don’t like the stud in the back.