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I've been using GM3 for my Marlin .357mag for the last 3 years.
Loading 357 case with 3.5gn behind a 158gn TC for 20yd indoor,(scoring 95/100)
and 5.5gn for the outdoor 50m range.

Its dirty stuff, but cheap, bought mine at £25 a kilo.

Paul101 wrote: Its dirty stuff, but cheap, bought mine at £25 a kilo.

Isn't that what they used to call "nutty slack" ?

Hi - I use 4 grains of GM3 in 357mag / 158gn RNFP - very accurate in my Winchester 94ae out to 25 yards.

Regards

Corrie