My 17Mach IV/17FB experience is with an Encore/MGM rifle setup first and now a Rem 700 SPS Sporter and in addition to the powders mentioned I also had some success with Reloder 7. I have mostly used the 20gr VMax and the now discontinued 20gr Berger but am starting to play with the 25gr VMax now that I have a 9 twist.
I haven't had to form cases yet but I feel that day coming soon with the status of brass production lately.
I had a friend who swore by the Bullberry double-ended form die for stepping down the necks while making 17 Ackley Hornet cases. It seemed to have a more gradual transition that made for less neck collapsing with the thinner Hornet brass.
1K.
