I tested plated bullets in the 45ACP and you can use this data as a means of estimating. I purchased H&G 68 type plated bullets from Xtreme Bullets. I wanted to reduce the amount of lead being blown out of my barrel. I have heard that for plated bullets you just use the same data as for cast. This seems to be true for velocity, but at the lower end of pressure and recoil, where I am operating, while the velocities were close, function was not. Ejection and lockback were not reliable with a load of 200 Xtreme plated bullet and 3.7 grains Bulleye. This even though the cartridges were oiled. However, a test load of 4.0 grains Bullseye with the Xtreme plated bullet functioned, ejected and lockbacked for my test rounds as long as the weather was hot. When it got cold, I had the occasional failure to eject, failures like stovepipes. So I bumped the charge up to 4.2 grains of Bullseye. No failures to eject but the recoil went up. You can't have everything.
M1911 Les Baer Wadcutter new 13 lb recoil spring
200 LSWC (H&G 68 type)
3.5 grs Bullseye Lot 919 11/2005 WLP Brass mixed cases OAL 1.250" Taper Crimp 0.469"
23-Mar-16 T = 69 °F
Ave Vel = 664.9
Std Dev = 16.18
ES = 51.71
High = 686.1
Low = 63.3
N = 8
stove pipes, would not latch slide
200 LSWC (H&G 68 type)
3.5 grs Bullseye Lot 919 11/2005 WLP Nickle, mixed cases OAL 1.250" Taper Crimp 0.469"
8-Jun-15 T = 91 °F
Ave Vel = 660.6
Std Dev = 16.37
ES = 60.28
High = 695.6
Low = 635.3
N = 22
Classic Bullseye pistol 25 yard Rapid fire load. Functioned every round hot weather , light recoil, accurate However, in cold weather, failures to eject. Likely reason, Ultradot and mount added weight to the slide and the load does not have the power to function when temperatures drop.
200 LSWC (H&G 68 type)
3.8 grs Bullseye Lot 919 11/2005 WLP Nickle, mixed cases OAL 1.250" Taper Crimp 0.469" oiled cases
8-Jun-15 T = 91 °F
Ave Vel = 714.4
Std Dev = 17.17
ES = 77.2
High = 755.1
Low = 677.9
N = 30
accurate
200 LSWC (H&G 68 type)
4.0 grs Bullseye Lot 907 6/20/2005 WLP Brass mixed cases OAL 1.250" Taper Crimp 0.469" oiled cases
23-Mar-16 T = 69 °F
Ave Vel = 723.3
Std Dev = 9.48
ES = 28.65
High = 741.6
Low = 712.9
N = 10
Lot 907 has been consistently slower than lot 919
200 LSWC (H&G 68 type)
4.0 grs Bullseye Lot 919 11/2005 WLP Nickle, mixed cases
OAL 1.250" Taper Crimp 0.469" oiled cases
8-Jun-15 T = 91 °F
Ave Vel = 742.9
Std Dev = 9.89
ES = 33.19
High = 760.6
Low = 727.5
N = 20
accurate
Classic Bullseye Pistol 50 yard slowfire load. Velocity of 740 fps provides consistent accuracy and function for a 50 yard load.
200 Xtreme Plated SWC
3.7 grs Bullseye Lot 907 6-20-2005 WLP Brass mixed cases OAL 1.250" Taper Crimp 0.469" oiled cases
23-Mar-16 T = 72 °F
Ave Vel = 651.7
Std Dev = 11.66
ES = 40.03
High = 676.9
Low = 636.9
N = 14
all ejected, slide failed to lock back once
200 Xtreme Plated SWC
4.0 grs Bullseye Lot 907 6-20-2005 WLP Brass mixed cases OAL 1.250" Taper Crimp 0.469" oiled cases
23-Mar-16 T = 72 °F
Ave Vel = 686.8
Std Dev = 26.32
ES = 91.37
High = 730.4
Low = 639.1
N = 14
accurate, functioned and slide locked back