GM3 and 357 Mag reloading

This section is for reloading and ammunition only, all loads found in here are used strictly at your own risk, if in doubt ask again.
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 treated as suspect and not used.

Moderator: dromia

Forum rules
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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dodgyrog
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Re: GM3 and 357 Mag reloading

#11 Post by dodgyrog »

Just bear in mind it is hygroscopic and pressures will grow if it gets slightly damp
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the running man
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Re: GM3 and 357 Mag reloading

#12 Post by the running man »

A lot of folk on the gr comp circuit use gm3.....in fact it turns up by the ton and then gets evenly distributed amongst the guys.....it's a green powder and measures well like bullseye....and it's cheap as chip! So no wonder it's popular...
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Re: GM3 and 357 Mag reloading

#13 Post by mag41uk »

An alternative that we are testing is Maxam csb5.
We have used a mountain of Vectan AS but availability/price is now dire.
I didn't know GM3 was still available at a decent price.
The Maxam you can get from here: http://www.claygame.co.uk/maxam-csb5-powder-pd18
Or Folkestone engineering.
There is loading data on Maxam`s website.
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Re: GM3 and 357 Mag reloading

#14 Post by phaedra1106 »

Any known proven loads for CSB-5 in the 44?, there's good reports using CSB-1 on the S&W forum but I can't see anyone selling it in the UK.
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Re: GM3 and 357 Mag reloading

#15 Post by Lever357 »

dodgyrog wrote:I've used it for 38 Spl loads but not magnum loads.
Just bought some GM3 at the Shooting Show yesterday so I can start reloading predominately .38 special for 25 yard indoor. What loads were you using for 158gm RNFP please?
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Lever357
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Load Data

#16 Post by Lever357 »

Bought my reloading gear last week at the shooting show and the powder I got is Vectan GM3. This is not listed in my Lee handbook.

Was wondering if people had experience of it and what they would recommend for a 158gm bullet in .38 Special case. Chap I bought it off reckoned 3.8 grains of powder.
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dromia
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Re: Load Data

#17 Post by dromia »

Have you done a search? This was discussed recently.
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Re: Load Data

#18 Post by Lever357 »

There was posts re Vectan for shotgun slugs.
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dromia
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Re: Load Data

#19 Post by dromia »

Obviously you need to learn search better.

http://www.full-bore.co.uk/viewtopic.php?f=11&t=29308
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Come on Bambi get some

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Analogue Good Digital Bad

Fecking stones

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Re: Load Data

#20 Post by Duey »

Search for GM3
Or look through this section backwards about 10 days or so
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