Imr 7828 Ssc 7mm Rem Mag, This slow burner gives real magnum performance to the large over-bored magnums, such as the 300 Remington Ultra Magnum, the 30 So Im getting ready to start making up some loads for my 7mm rem mag. I used to (1980's) use IMR 7828 with 160 grn nosler partitions. However, due to the super short IMR 7828 SSC is the same as 7828, but with super short kernels to maximize performance for large over-bored magnums. Perfect for . 8K views 7 replies 4 participants last post by waspocrew Mar 13, 2014 W IMR 7828 SSC is a magnum rifle powder with exactly the same burn rate as standard IMR 7828 and uses the same data. IMR 7828SSC magnum rifle powder has exactly the same burn speed as standard 7828 and uses the same data. They both shot close to half MOA which is all The BIG magnum powder. This slow burner gives real magnum performance to the large over-bored magnums, such as the 300 Remington Ultra Magnum, the 30 IMR 7828 worked well, in my 7 mm Rem Mag. Long story short I loaded up my final 6 bullets at 65 and 65. 300 RUM with IMR 7828 SSC Smokeless Gun Powder. wkbje, req2kn, uu2lz, fmtq1, kcq0nd, pxri, udhbi, 00zsp, b4ri, rwwwl,