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I usually use 4198 but when I googled a load for .577 BPE that popped up. I might switch back to 4198.

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Mike,
4198 would be the realistic choice for NfB (with backer rod or Dacron filler). 40-44% of the original Black Powder weight to start, and bullet weights equivalent in weight to original loads.
Yes, period NfB Cordite loads “usually” regulated with bullets somewhat heavier than the ones used in the Black Powder loadings.

Have fun with the old girl!

- Mike

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"Will Rogers never met a fighter pilot"
- Anon

“Always carry a flask of whiskey in case of snakebite, and furthermore always carry a small snake."
-- W. C. Fields

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