Use a better bullet.
Most FMJs are very low quality, and very inconsistent.
Use a Hornady FMJ, if you really WANT an FMJ in the load, and you should see things improve.
If you're just after CHEAP, then keep chasing your tail and jumping from bullet to bullet while wasting powder, primers, and case life.
Buy a reasonably decent bullet to use*, and most of your troubles should wash away...
*Name brand (other than Winchester), non-import, and, if possible, not an FMJ. The price difference is not that much.
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Don't even try it. It's even worse than the internet would lead you to believe.
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