So I loaded and tested the Lyman 358419 170 swc in federal 38 cases with cci 550 spm. The loads were 8.0-9.0 in .2 grain increments with blue dot. I did get some chronograph data. The chronograph was working good, but we moved and the readings got a little erratic and was equally erratic with other pistols being tested, but I at least wanted ballpark data. The first 8.0 grain loads were smokey, but immediately cleaned up at 8.2 and I never observed any muzzle flash or blast. The coal was 1.535 seated to the crimp grove and given a good crimp... maybe not a Charlie98 death crimp but at least respectable. Accuracy was not my primary goal so I did not record groups. The 8.2 load printed good enough for me to take note and try that again. The initial test was conducted in my 4" colt trooper. My next test will be in the 16" marlin carbine. Overall I consider the test a success and the charges were reasonable.
8.6-893,945,914
8.8-931,956,1026
9.0-923, 979, no read.
I don't have a lot of faith in those numbers as the crono was acting up threwout the day. I suspect that the longer carbine would get much better velocity and more stable SD numbers.
I have a second string of numbers in another location at the same range that look much better
8.8-930,917,898,976,910,927