What brand copper plated bullet? Rainer? Berrys?
Think your 9mm may be a little hot for start loal.
My Lyman Pistol and Revolver shows 9mm data at:
125 JHP Bullseye 3.9 gns. start - 4.5 gns. max, 1.075 OAL, CCI500
125 Lead Bullseye 3.3 gns. start - 3.9 gns. max, 1.115 OAL, CCI500
Speer shows 124 TMJ with Bullseye at 3.9 start to 4.4 max, 1.135 OAL, CCI500
Alliant on-line guide shows 4.4 as the maximum charge for a Speer 124 grain bullet.
You should likely start with a lower charge as the 4.4 is shown to be a maximum.