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Lowkey, I really can't comment on the 777 because I have never used it. I had some pyrodex once when they first came out with and dumped it in a mud puddle after useing it a couple of times,Lol.
I would think that if you haven't had any problems with the 777 yet and it works well for accuracy that it should be fine. Some people say that the remington loaded with 35g FFFg and a .454 ball give's about the same ballistics as a .38 special +P Load. I really believe it's a little more than that but that's just a guess on my part. If the 777 gives off 15% more velocitey then that gun of yours should be Smoken!!, Lol
As for the different powders they were made to be used in certain caliber guns because of burn rate and preasure caused. If you used the same amount of fffg in a shotgun as you did useing ffg you could be asking for trouble. Here is what the Goex chart say's:
1-fg -used for very large bore guns.
2-ffg-used for .50 calib. or above and shotguns.
3-fffg- Standard for .31, .36, and .44 Calb.
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