Chip,
To be honest, the idea of "seasoning" a modern in-line is more of an "old wives tale" than a fact. I have no doubt that is was of benefit to the older technolgy ball rifles of the past, but the new in-lines are made of much stronger and less porous metals and their rifling is cut much thinner. For instance, my Knight has lands that are only .0015" deep so anything that even remotely tries to fill any of the grooves between the lands quickly affects accuracy in a negative way. This gun (like all in-lines) was designed to be shot "smooth & clean" - without any seasoning and with very little fouling left in the bore between shots.
But like all rifles, it does have some rough edges and microscopic peaks & valleys in the bore due to the rifling process. Removing these irregularities will improve accuracy and that is why I recommend the patched ball (or pure lead conical) shooting. I shot sabots exclusively for about the 1st year I owned my Knight and I was well satisfied with its accuracy. Then I read where someone recommended shooting at least 20 to 50 balls to get a barrel broken-in. So I picked up a 25 pack of Remington .490 balls, & some lubed .015 patches & headed for the range to shoot them all up. Afterwards, the next time I went to the range to shoot sabots, there was a significant improvement in the guns accuracy. Now days, this gun will just plain shoot any bullet I throw at it (as long as it is 300gr or more). I just adjust the powder charge to maintain my zero and the gun does all the rest. Typically, I can shoot better groups with my "beginner-class" Knight USAK than I can with my Springfield Match M1A........that's kind of scarey <img src=icon_smile_approve.gif border=0 align=middle>.
"Every moving thing that liveth, I give unto you as meat" (Gen 9:3)
Trust God..........but keep your powder dry!