I am using 777 pellets right now and have never tried the loose powder i was wondering the advantages to using it versus the pellets. If I do try it how hard do you seat the projectile against the powder? I have always been concerned using the pellets I sometimes wonder how hard you have to push down to crush one and then what would happen if you did. Also is 100 grains of loose the same charge as 100 grains of pellets?

To answer the last question first,NO,the pellets are designed to give the same results in velocity as pyrodex pellets; loose is 20 percent faster it is a fast burning powder compared to other black powder subs which means its good for short barrels it also means that it generates higher pressure faster. I will not load more than 110 gr in my mag rifles because of the strain gage readings.
As each gun is an individual in certain things like load and bullet preferance,loading pressure ties right into those varibles the most important things are:
# 1 know how much pressure you are using ;and be consistant.
# 2 Be consistant with your cleaning procedures
# 3 number your shots in the order they were fired and keep a record so that you can recognize patterns
# 4 learn to remember exactly where you were holding when the gun went off so that you know when to remove shots from the record.
# 5 Understand that you must find what your gun likes and give it what it needs to get best results
#6 most modern inlines are capable of 1 inch or less groups, each one requires different loads and componants to get those groups because of the way the barrel whips can be changed by small differances in the metal and where the movement starts its cicular motion due to the rifling.
Hope this helps your understanding , Lee