True Blue produces the best and most consistent SDs and groups I have seen in 38 / 357.
I am in the middle of working up 38 / 357 loads in True Blue--and I am mightily impressed.
I first test-fired some 38 Special rounds this winter--e.g., not over the chrono--and found a 1.0-gr. wide "sweet spot"--shot tight, tight groups and to nominally the same POA in loads ranging from 5.0 to 6.0 gr. under a 158LSWC.
I've now run loads ranging from 5.2 gr. to 6.4 gr. in 38 Special, and from 6.6 gr. on up in 357--and the SDs remain all under 20--one, at 7.6 gr. in a 357 case, under a 158LSWC clocked 985 with an SD of 7.28 (ten shots) from my M60 / 3" barrel. Keep in mind that the Ramshot manual shows a max of 9.8 grains under a 158LSWC in a 357 case.
At 8.8 gr. in a 357 case, a sample chrono (five rounds) showed about 1070 fps from my 640 / 2" barrel with an SD of 18.6.
There can be some combustion issues with the lower-pressure loads, but it doesn't do badly at all. For example, after 150 rounds in the 640 yesterday--of which 100 were with TB and 50 were with 4756--I had less cylinder binding and grunge. Leading, BTW, with the Mastercastbullets.com 158LSWCs, was minimal.
I still have some more testing to do to validate these results--but I think it is amazing. Like Dudley, I bought four lbs--but my next order will be th eight pound jug.
Jim H.