Back in my original days of handgun reloading about 30 years ago, I too used Blue Dot to make factory-equivalent 125 grain .357 Magnum loads. I loaded 14.5 grains under a Sierra 125 JHC, and used it as a carry load in my 4" Ruger Security Six. That load was a humdinger: ear-splitting bright muzzle blast, plenty recoil, and accurate. Carried in 85 F to 10 F. Never recall a problem. Velocity ran 1450 fps.
When I got a 4" Colt Trooper .357, I loaded 13.7 grains of Blue Dot with the 140 grain Speer JHP. That was another real blaster that did 1340 fps.
I liked both loads. Don't load .357 anymore, but given all the hoopla I wouldn't use Blue Dot if I did.
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