I have two questions I would appreciate your input on; the first being is Hogdon HS7 the same powder as Winchester 571, and can they be used interchangably?
The second question concerns wild variations using HS7. My Lyman 46th edition Reloading Handbook has as a starting load using a 125gr. JHP in .357 Magnum as 10.9 going to 14.4 gr as a max load. Respective pressures are listed as 21,400 & 39,200.
My Frankford Arsenal .357 Loadmap from Midway lists the same 125gr, JHP starting load as 9.2 gr of HS7 @ 25,100psi and the max load as 10.5gr @ 35,000psi!
That is almost 5 grains of difference, with the starting load from one being the max load in another! Now you all know why I would like some input!
The reason I ask is that a friend gave me an 8lb jug of HS7 that he found unsuitable for the shotgun shell loads he bought it for. So I have a LOT of it and wonder what to do with it all!