lemoyne

The primers and tightness of sabot and weight of bullet will have some effect on the way your powder burns so there will be some differances. That said in my System One which I have been doing some experimenting with 777 in 83 to 84 gr of loose gives the same velocity and close to the same reading on the strain gage as 100 gr of 777 pellets which is what should be expected as the announced goal when they chaged the pellets was to get the same velocity as 100 gr of Pyrodex pellets. Since 777 is a faster burning higher enegry powder ithas its best comparison in short barrels where its hard to burn all of a slower powder.
That also means that max load will be lower. After doing some testing on the strain gage I came to the conclusion that 120 gr of 777 should be my absolute max as it gives about the same reading on the strain gage as 150 Pyrodex. My biggest suprise on these tests is that 777 in FF and FFF give very close to the same reading on the strain gage. Excuse me for rambling. Lee