I load a 169gr cast in a .308 with 25grs 2206H and 27grs 2208 for around 1800fps the .303 should be safe with the same loads, cast bullets have lower pressure than jacket bullets with the same powder charge
you will get leading in the barrel before you reach high pressures and accuracy will go out the window, the case will be over half full so fillers won't be necessary if you go much lower you will need a filler
to keep the powder against the primer.
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