Years back took some 3"-ers apart. The RP's #7.5 pellets ranged from .093 to .0975, avg = #7.5s. Crude hardness test (OK, pliers) comparing with known (had it sent out) 4.5% antimony #8s suggests these #7.5s were harder.

Shot charge = 309 gr, about .706 oz (11/16 oz = .6875 oz = 301 gr).

Regarding #6 RPs, got an avg of 87 beautifully distributed #6 pellets within a 20" circle at 40 yds through a 0.016" M-42. That worked out to 56% in 20", and with 1250 fps MV. A phez could not make it through that 20" circle alive. Dave Carrie wouldn't like them well-centered on his butt.