I've not used the latter but I have plenty of experience with regular IMR7828. Like Hodgdon 4831 and 4831SC, I'm wondering if there is a difference if using the new 7828SSC? Here's what they say from the website: IMR 7828SSC This magnum rifle powder has exactly the same burn speed as standard 7828 and uses the same data. However, due to the super short kernels, metering is virtually as good as a spherical powder. This allows up to 4% more powder space in the case and in many loads yields more velocity than standard 7828. Such loads are marked with an asterisk in the data to show where standard 7828 will not fit. Just wondering if anyone has done field tests. Thanks.