I have not been able to find anyone who will chamber the short mag's in an Encore. Is a 15 inch barrel considered legal in a rifle? I believe I read once that the shorter the barrel, the heavier the bullet you want to use. I believe it has something to do with length of time bullet is in barrel. I believe the article also suggested using a faster burn rate powder. I have not done this, but I am considering doing it in a 30-06. I hope some other people chime in. Tom.