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Are you looking for sub sonic I have loaded and cronoed some using data from the 300 blkout site but all the loads I worked up are sub sonic and every gun will be a little different. There is a thread on there I got my info from
check out info on the castboolits.com forum. lots of cast bullet info and loads as they are the ones who are making/having made the heavier bullets (NOE has a nice 247gr cast that is what many are using):
here's one thread but there are many points of discussion there so finding some good starting loads shouldn't be hard:
http://castboolits.gunloads.com/sho...lackout-cast-load-data&highlight=300_blackout