You are correct on the name "Accelorator " I can't remember which company made them. They never proved to be accurate enough using the .224 dia. bullet, 55 grains as I remember, when fired in either a .270 or .30-06. Alas, bad press, expense of the rounds, and lack of performance pretty much drove the final nail in that coffin.
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Just lettin' it roll, lettin' the high times carry the low
Love livin' my life, easy come easy go