let's do the math :
( 7000 grain/lb ) / ( 30 grain /cartridge ) = 233.33 cartridge / one lb
$50 /233.33 = $.21 / cartridge ,
lower the price to $40
$40/233.33 = $.17 / cartridge
$.21 - $0.17 = $0.04 difference
am i right ?
Never had a reloading application that used 30 gr of IMR-4350. ~45 gr in a .260 is the lowest charge weight I've ever used. It changes your delta a bit.