Some one told me about doing this and my curiosity got the best of me, I do know primers can make a differance in accuracy in muzzle loaders as well as in reloading. I do not believe the business about the sabot being moved before the powder burns.
The check to see what the 209 is doing is simple, a lubed patch on a jag on a ramrod marked and weasure how far it moves the answers will be relative depending on how heavy the ramrod is and how tight the patch is.
Distance moved
#1 Rem muzzle loading 9.7"
#2 Win standard8.2"
#3 CCI " 7.7"
#4 Win made for inline7.2"
#5 Fusion 6.7"
#6 Win 7774.6"
#7 Fiocchi 4.2"
#8 20 year old Win 6.2"!!!!!!!
#9 25 apc.7
The old WIN 209 shot different [did not group]
I thought some of you might be interested, to the rest I apologize for the long post.
Lee