MP-300 or 410 Powder?

[tjen]

I am mainly asking about loading the 410 3" 11/16oz load, But if anyone is using the MP-300 in pistols how clean is it?

I bought the Alliant 410 with their web sites listing of 13.5grs I picked up a bushing to load it. My new MEC and Lyman manual where so far off I stopped and have a call out to Alliant to veriffy its right.

Next both MP-300 and 410 list 1200fps but MP-300 psi is 9500 and 410 1250. Any thoughts on which to choose just on pressure? 410 is supposed to be the cleanest powder for the 410 there is.

 

[Wincheringen]

Hands down 300MP. 410 really eats up hulls. H110 or W296 is much better than 410 if you can't find 300 MP.

 

[tjen]

Thanks I look for 300-MP and which bushing to use for it. I also am just learning that maybe I should use 2 1/2" for the best pattern and the big one velocity 1250-1300 fps is doable with 1/2oz loads and 300-MP.

Thought the extra shot in an 11/16oz (3/16oz) would be better but sounds like it may be a dettrament resualting in poor patterns due to the long shot colum / high presure and yet with less velocity.

I have size master 3" but it came with 2 1/2" crimper and can be adjusted.