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I'm trying to work up a load for .38 Spl & .357 Mag using VihtaVuori N340. Bullets being used are: .38 - Hornady 148 gr HBWC. .357 - Remington 158 gr JSP. I'm using Winchester SP primers for both. All my manuals, including VihtaVuori's, don't give a load for N340 with these bullets. I'm looking for good accurate loads, not necessarily velocity busters. I'll be shooting these out of a 4" S&W 15 and a 4" S&W 586. Anyone have any suggestions? Thanks.
Tom
 

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Vihtavuori lists a Sako 148 LWC with an OAL of 1.181" and a start charge weight of 3.9g of N340 for 863fps and a max charge of 4.0g for a velocity of 895fps. Data is from a 6 1/2" test barrel with a 1 in 18" twist using Sako cases.

There is not a listing for a 158g JSP for .357 Magnum, but there is a listing for a 158g JHP (Speer). It SHOULD be safe to use starting data for the JHP, although it would be worthwile to check the length of the bullet you are using against the length of the Speer JHP to confirm that the internal case capacity will be the same at the same OAL.

Start 6.7g N340 for 1117fps and max of 7.4g N340 for 1198fps from a 7" test barrel with a 1 in 18" twist rate using Remington brass and OAL of 1.575"

I found the above data here:

http://www.lapua.com/USAguide.pdf
 

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I think N340 is neither fish nor fowl in your case, slower burning than usual for .38 wadcutters, faster than will give full power magnum loads.
Do you have it on hand? You will get by with the published loads forwarded by Big D.
If you are buying new, look at the loads for N320 for .38 wadcutters and N105 or N110 for the Mag. Trying to standardize on one powder over that wide a spread will not give best results.
 
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