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.
GM3 powder
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All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
All handloading data posted on Full-Bore UK from 23/2/2021 must reference the published pressure tested data it was sourced from, posts without such verification will be removed.
Any existing data without such a reference should be treated as suspect and not used.
Use reloading information posted here at your own risk. This forum (http://www.full-bore.co.uk) is not responsible for any property damage or personal injury as a consequence of using reloading data posted here, the information is individual members findings and observations only. Always verify the load data and be absolutely sure your firearm can handle the load, especially older ones. If in doubt start low and work your way up.
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meles meles
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Re: GM3 powder
Paul101 wrote: Its dirty stuff, but cheap, bought mine at £25 a kilo.
Isn't that what they used to call "nutty slack" ?
Badger
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Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
CEO (Chief Excavatin' Officer)
Badger Korporashun
Quidquid latine dictum sit altum viditur.
"Quelle style, so British"
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griffc
Re: GM3 powder
Hi - I use 4 grains of GM3 in 357mag / 158gn RNFP - very accurate in my Winchester 94ae out to 25 yards.
Regards
Corrie
Regards
Corrie
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