I'm trying to utilize a ball powder and stay under the 1700 fps recommended for the Berry's 150gr FN copper clad. Will be running them through my Marlin 336 micro grove.
I'm a bit worried about detonation due to too little powder.
I have some Unique that I can work with and have recipes for that powder in a light .30-30 load.
Just looking to try the slower ball powder.