Asked about using 900 gr saboted bullets in
3" plastic cases in regular barrels with
4759 or RL-15 and starter powder.
With bullets that heavy you'd have too
high of pressures with 4759
for plastic cases. Possibly could do
it with RL-15 and starter
powder in plastic, but only
in heavy barreled like NEF.

But the 600 gr Dixie is still the best for
most uses in plastic.

A NEF and brass RMC cases would handle 900 gr
Saboted bullet with RL-15 and starter powder. Start
at 80 gr Rl-15 and go up if cases don't
expand to much to resize.Ed