Are you looking for subsonic loads or something to get out there with???
I'd look at 2400 in the 18-25gr range. I've been using 28gr of 2400 with 605gr bullets in the 510. Thats a subsonic load. If you're looking for supersonics try 22gr and work up. I've also had good luck with 4227. Its been good for subsonics but really shines when going hotter.
Frank
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