TC has tightest bores in the inline industry .4995-.5015 I use The Barnes “Spitfire T-EZ in my gun in 250gr bullet weight all copper flat base. Sabot is the hph-24. Note if you buy a pack of The Barnes “Spitfire T-EZ the supplied sabot with bullet is the hph-24 it works very well in tight bore guns. Powder Black Horn 209 Primers cci 209 magnum shot shell primers not the ones special for muzzleloaders. Never fails sub MOA accuracy at 100 + yards.
Only tip I can give is work up your load mine held tightest group at 95 gr powder load so did the other one on range that day as measured by volume in a powder measure. we started at 80 gr.
That 90 gr load gives me 1900.00 FPS at barrel.
Zero at 150 yards puts me. 3.33 inches low at 175 yards never go higher or lower the 3 1/2 inches out to 175. Still moving 1338 FPS at 175 yards with 994 ft/lbs. Over 1000 ft/lbs under 150 yards.
The all copper bullet has insane sectional density so it will penetrate.
Expansion is very good thanks to the poly tip.
Bullet weight retention is around 100% being all copper
I would try this I have 2 omegas both setup on this shoot sub moa all day maybe it will work for yours to.
One last thing if you go with BH209 powder use oil based solvents to clean the gun. Hoppe's #9 is good stuff. The other powders use water based solvents to clean up like t7 pyro n such.
GL HF MWP