If you feel it is an ammo problem, and changing powders doesn't help, check the bullet. Weigh several of the cast bullets. If they vary more than 0.1 or 0.2 gr. either way, it could be the bullets have casting voids, and will be inaccurate no matter what. Also, load them with the sprue mark forward. The base of the bullet is far more important than the nose for accuracy.
In the long ago days of yore, some bullet moulds were made purposely so that the sprue cut off was at the nose of the bullet.
(Lewellen?). Walt
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