Hope this helps....there's alot of technical info and test data on hevishot.com that is not on remington.com
Can I use my current Remington shotgun/choke with new Hevi-Shot Turkey Loads?
Yes. Remington has extensively tested Hevi-Shot through various Rem-Chokes. The top-selling choke, diameter and resulting Hevi-Shot pattern percentages are as follows:
Ventilator (.655") 87% 30" circle, 40 yards
Full - Lead Only (.691") 88% "
Full - Lead or Steel (.691") 88% "
Turkey Extra Full (.687") 92% "
Turkey Super Full (.665") 93% "
NEW Hevi-Shot (.675") 94% "
Tighter chokes than .665" do not improve pattern percentages to any extent and in fact begin to produce more open patterns.
Hevi-Shot can produce cosmetic rub marks in barrels and chokes, simply a change in surface finish. Over an equal number of rounds, this rubbing is similar to that experienced with steel shot. Both materials create more choke strain than lead shot due to a more solid payload. With the Remington wad column, the Hevi-Shot pellets rest on a cushioned pad in the shot container that allows the pellets to flow better through the choke. In addition, the Remington Hevi-Shot shot container is much thicker than previous Hevi-Shot loaded rounds and that thickness minimizes pellet contact with the barrel or choke.
Under laboratory test conditions, Remington has fired in excess of 500 rounds through each Remington choke tube offered, including Ventilator (.655") and "lead only" full (.691") without any dimensional changes being encountered. With the limited number of rounds used in normal Turkey hunting, Remington's testing represents many lifetimes of reasonable gun use.