Can't help with your question, but I do want to welcome you to HuntChat.
Come to think of it, maybe I can help a bit.
With that twist rate, I'd guess that you'll be well served with bullets in the 140-gr range. Powder choice is easy: IMR7828 was the powder in original factory loads, and it's still a good choice. The new Short Cut version of 7828 may be even better.
Other super-slow powders that should work well are Retumbo, Big Boy, AA 8700 and RL25. Norma MRP also fills the bill if you can find any.
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