Haven't got any sorry BUT suggest if you plot your 215grn data against 180 grn data the difference is 35grns so add projectile weight= minus powder weight. The difference between what they are will be close enough to next step up in weight.... Give you starting point anyway,I'm guessing your looking to run subsonic or close to it??? So possibly 308 data will be very close... You should find data for that weight and be able to cross reference etc to work it out.
Bookmarks