I have to load mine a little short on the OAL, due to magazine length, so you may be able to go up from my loads. I have found 64gr of RL 19 gives me pretty good speed and good accuracy. 63gr of IMR4350 also worked well for me, not quite as much speed as the RL19, but still had good accuracy.
You might try the hogden annual loading manuals that come out, thats where I found the load data for my 220's.
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