Thread: What happens when your case has lots of room left?

Originally Posted by lee308

I've been reloading my 223 and 308 and always filled the cases up and sometimes compress loads with a drop tube.
But i have noticed with 303, 6.5x55 and 7.5x55, there is lots of room left but the max load has suggested not to load anymore.

I have some understanding of why the case should be reasonably full but need some more experienced people to tell me a bit more.

Any experts on this topic?

If you have to use a drop tube with the .223 and .308 you are using too slow a powder, AR2206H is a good powder for both cartridges,
the 303 6.5x55 and 7.5x55 are some of the earliest smokeless cartridges, The early smokeless powder was less powerful and bulkier
than modern powder as long as you don't go over max loads or under start loads you will be fine,
AR2206H works well in the .303 use 174 - 180 grain bullets they fit the throat better than lighter bullets