Nope, at least not in my gun. I have done extensive work with 777 in my Old Army and various bullets. With the round ball the max load of 777 is 45 grains by volume. At the muzzle this pushes the ball out at an average velocity of 1,193 fps. This gives a muzzle energy figure of 465 ft lbs. This sounds good until you move the load out to 50 yards. The round ball has a terrible ballistic coefficient. At 50 yards the velocity has dropped to 976 fps. This drops the energy at 50 yards to 311 ft lbs. So nope the max load with the round ball won't do it.
Don't worry all hope is not lost. I have shot other loads that will meet the law. Here they are:
Lee 225 grain conical bullet.
30 grains of 777 by Volume.
Average velocity: 918.5 fps
Muzzle energy:422 Ft lbs
Estimated velocity at 50 yards:875 fps
Estimated energy at 50 yards:383 ft lbs.
Ok this load is just shy of meeting the law.
Lee 225 grain conical bullet
35 grains 777 by Volume
Average velocity:1,028 fps
Muzzle energy:528 ft lbs
Estimated 50 yard velocity:963 fps
Estimated 50 yard energy: 463 ft lbs
This one easily meets the requirement.
Lee 250 grain REAL bullet
30 grains 777 by volume
Average velocity:879.4 fps
Muzzle energy:429 ft lbs
Estimated 50 yard velocity:839 fps
Estimated 50 yard energy:391 ft lbs
Ok, this doesn't look like it meets the requirement, however my bullets actually weighed in at 260 grains plus. Using that weight puts the estimated energy at 50 yards at 406 lb feet so it would meet the requirement.
Here are some pictures of the bullets mentioned above.
First off the 250 grain REAL bullet:
Now the 225 grain conical bullet:
Jerry