Alliant 300-MP in 357 Magnum and Different Bullet Weights

[wasa]

I've been using Alliant Power Pro 300-MP in my Ruger Blackhawk with 125gr and 158gr jacketed bullets and am happy with the loads. I usually load about 1-2 grain below maximum listed with no negative indication on the cases or primers.

However, I would like to use other bullet weights (since I have many hundreds of them), but the only two published sources I have of loads (Alliant PDF/web and Hornady #9 manual) only list select bullet weights (example Alliant 125gr, 158gr, 170gr). There is nothing in my Lyman 48, and I see nothing listed online with Speer or Nosler bullets.

http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=29&cartridge=28

I have lots of 110gr, 140gr, and 150gr jacketed 0.357" projectiles that I would like to use. Does anyone know of a published source for this powder in 357 Mag for these bullets? Could anyone check Lyman 50th, Sierra, or Hornady #10?

Alternatively, does anyone have experience interpolating to these bullets (yes, I know that I am responsible for my loads)?

Alliant lists

125gr - max 22.3gr
158gr - max 18.6gr
170gr - max 17.5gr

So, 22.3gr of 300-MP for 110gr may be reasonable. 18.6gr for 150gr or 140gr projectiles may be reasonable.

Thoughts?

 

[snooker]

You can extrapolate, but powders results may or may not be linear. Use the published data thats close to your desired bullet weights and start low, and increase slowly looking for pressure signs, velocity, etc. You shouldn't just load 1-2 grains below max without this work up.