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First "mag" MLs i remember are from around 2002-2003 but there may have been some earlier ones. Triple7 was announced or released around 2002. T7 pellets came out about a year later. Hodgdon does mention the larger loads in the Firestar pdf file but clearly states its from the manufactures not them.
For most of use the 50fps gain over the old 2 pellet loads is meaningless. It wont produce hardly any worthwhile gain but cost way more per shot. Pretty sure even 2 of the mag pellets would be slightly cheaper to shoot and faster. You will get about 100fps increase from the mags vs 2 of the regular pellets. Its like i said...more of the same propellant by weight is producing more speed. The mag pellets are around 37gr each. 60ish vs 72ish vs 74ish actual amounts of powder. Equivalent IMO went out the door after Pyrodex. Anything that came after makes more speed and/or more peak pressure.
so the recommended charge weight by Hodgdon Powder Company is, therefore, three (3) FireStarPellets.
For most of use the 50fps gain over the old 2 pellet loads is meaningless. It wont produce hardly any worthwhile gain but cost way more per shot. Pretty sure even 2 of the mag pellets would be slightly cheaper to shoot and faster. You will get about 100fps increase from the mags vs 2 of the regular pellets. Its like i said...more of the same propellant by weight is producing more speed. The mag pellets are around 37gr each. 60ish vs 72ish vs 74ish actual amounts of powder. Equivalent IMO went out the door after Pyrodex. Anything that came after makes more speed and/or more peak pressure.