A few months ago I went to an gun shop before an range session and picked up some bh209 and an pack of tc shockwaves 185gr i be leave. I nearly need an mallet to start them. when I pulled my load at the end of the season I noticed some type of plastic looking chunks. I know i been testing with with teflon tape on the breech plug but did not have any on it at that time, just grease.

as of late, I been double checking all my bore diameters. getting ready for the switch to home cast conicals and boolits. the 45cals diameter is at .454 from checking the skirt of the powerbelts I have been using the only takes thumb pressure to start and slugging the barrel.
(yes my hunting load was an 275gr hollowpoint powerbelt with 75grs of bh209)
here is the 2 questions

1: should I see if i have any of the shockwaves left and measure the base of the sabot?

2: what do yall think the chunks of "plastic looking stuff" was? piece of sabot i may of broken off and missed cleaning or teflon tape i missed?

PS
plz, pb trashing, that is not the topic!!!!