Federal HW 7's and Hevi 13 choke

[Longshanks]

Safe to shoot this combination?  Myself and others are shooting this combo with great results.


170's in a 10 @ 40. (Beretta 390 20 guage)

[albrubacker]

Shouldn't be a problem, this is copied from Hevi's website.
Extreme range choke tubes are not recommended for steel pellets larger than BB or excessive speed of more than 1550 fps. Use mid-range choke tube for those applications.