The Lyman 47th edition Reloading Handbook shows a max of 5.0 grains with a 358156 155 grain bullet. I've used a lot of it at 4.7 and various 158 SWC with the following results:
Gun: Model 686/4"
Load: 4.7/231 + 158 SWC
Average velocity: 837.7 fps
Extreme spread: 72.86
Standard deviation: 30.61
Gun: Model 15
Load: 4.7/231 + 158 SWC
Average velocity: 868.7 fps
Extreme spread: 23.38
Standard deviation: 10.44
Gun: Model 60/2"
Load: 4.7/231 + 158 SWC
Average velocity: 789.3 fps
Extreme spread: 61.38
Standard deviation: 25.55
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