Originally Posted by bh5k
Good looking gun trebark. My setup is faily similar to yours. I have a Bat action, 30" Bartlein barrel, Leopold Mark 4 8.5-25, Jewell trigger breaks at 1.5 OZ, A-5 black and gray stock.
Sounds like a badass shootin' stick. Post some pictures of it.
Although it wouldn't be bad to try all the powders you have in stock, I would lean more towards the Retumbo and H1000 as they are much more temp stable than the other two.
Remember to run all your loads over a chrono so that you can add velocity/ES/SD into the equation along with accuracy. I would rather have a load that shoots .5moa (at 100 yards) with an ES of 10 than a load that shoots .25moa (at 100) and an ES of 30.