ORIGINAL: Pittsburghunter
With most powders your second or third shot will be loaded a bit higher in the barrel due to fowling period. With T7 the crud ring makes it hard to clean but the volume of space taken by the fowling is about the same as bp or Pyrodex.
It seems the area below the bullet gets most of the fowling and that restricts the size of the bore. I am not alarmed to find shots that seat a bit above the "witness" mark on the ramrod within reason. As long as I know I seated the projectile firmly I am not worried.
Right, and I sometimes think the reason for the higher seat is purely the result of the volume occupied by fouling below the previous seat lifting the powder column. Not specifically contact with this heavier fouling by the bottom of the next loaded projectile.
Anyway its best to make the first shot count, then one can take all the time in the world loading the second round. Usually, it doesn't matter whether it takes 10 seconds or 60 seconds to load that second round. I personally think its more important to relax and take one's time loading again so that mistakes aren't made. For example, loading a bullet with out a charge, or forgetting to prime. Better to do it slowlybut correctlythan do it fast and get it wrong.
Happy Hunting, Phil