I loaded up some experimental .44 Mag rounds to see if this obsolete Winchester 571 powder is any good in the .44 Mag cartridge. I used HS7 data from an old Hodgdon booklet, which someone at Hodgdon was kind enough to photocopy for me. (The two are the same powder). The data range is 11.0 to 13.0 grains for 240-grain JSP.
I loaded 240-grain Speer Gold Dots with 11.5, 12.0, and 12.5 grains, using CCI Magnum primers, mixed cases. I have a chrono and I'll go to the range in a few minutes to try them out in my 8" scoped 629 at 100 yards.
In the meantime, if anyone here uses or used this powder in .44 Mag, I'd love to get your opinion and experience with Winchester 571 / Hodgdon HS7.
I loaded 240-grain Speer Gold Dots with 11.5, 12.0, and 12.5 grains, using CCI Magnum primers, mixed cases. I have a chrono and I'll go to the range in a few minutes to try them out in my 8" scoped 629 at 100 yards.
In the meantime, if anyone here uses or used this powder in .44 Mag, I'd love to get your opinion and experience with Winchester 571 / Hodgdon HS7.