Smokeless loads

[sdharley]

I have 2 C Sharps Hiwalls. One in 40-65 and one in 45-70.I would like to work up some smokeless loads with reloader 7 powder that I have on hand. I cast a 550 grain bullet for the 45 and a 400 for the 40. Can anyone give me a good starting load for each that is aproximetly equal to black powder velocities?
thanks Curt

[EDG]

Lyman 40-65 data that came with the cast 400 grn BPCR bullets that they sold about 15 years ago
See the last row for Rx7




Start
Velocity
Pressure
Max
Velocity
Pressure


Powder
Weight
FPS
CUP
Load
FPS
CUP











GOEX Ffg
na


50
1090
11,100


COEX Cartridge
na


48
1089
10,900


Pyrodex RS
Actual weight of charge


34
1091
12,600


Pyrodex Select
Actual weight of charge


32
1090
12,100


AA 5744
17.5
1104
11,600
22
1307
18,500


IMR 4895
28
1249
15,000
32
1483
17,800


SR4759
17
1140
8,900
21
1373
17,900


IMR 3031
28
1258
11,100
33
1488
18,200


IMR 4198
21
1236
11,200
25
1442
18,700


Varget
28.5
1235
8,200
33.5
1418
17,000


Reloder 7
18.5
1208
15,300
23.5
1359
18,100

[EDG]

.45-70

This is 500 grain bullet data from Speer 13

>>>>Reduce the loads a little for the 550 bullet<<<


Re7 start 28.0 vel 1166

........max 32.0 vel 1259

[sdharley]

Thanks