I am pretty sure others may do this or in some other form...
Cut and paste from my post at GTA...
I use a home made plastic pellet seating tool ( a small allen wrench will work) instead of a extended probe to seat my pellets just past the port. 1377/1322/2100 the 853 came with a long probe...
you can definably feel that some seat much easier and a few very hard but for the most part about one in 12 was tighter.
with the my stock 1322
once in a while when I first set up my T.O.F. chrono and before I was seating my pellets I would get a very high fps that equaled my later seated numbers.
it ended up being that if I pointed my 1322 down while pumping most pellets seated just past the port and a few tighter ones did not seat all the way past the port
well having had accuracy probs with my 1377 because of concentric rings at lead in and burrs at the port, I took a good look at the barrel of my 1322.
what I saw was close to the below pics and show that there is something that can be done to help the barrels handle the slight inconsistencies in head size I am getting less fliers and slightly better groups for having done it
I just put a 14.5 barrel on my 1322 and used the same dowel (Cone shape one end) to sand the barrel bit by bit until my pellets seated just past the port.
in that process I also removed the hard edges at breech and at beginning of rifling, which is what I did to the stock barrel and that helped reduced the fliers and the size of the fliers deviance from the group.
I think some of the pellets (especially the larger ones) caught on the hard edges and became slightly deformed
seating effort is much more consistent...
the pictures are from Woody67
(inside harassment with Font size
pics of breech end of barrel are in this thread...http://www.crosman-air-pistol-owners-forum.com/board/index.php/topic,12918.0.html