That explains your leading.
Throats swaged bullets to .426 and you got blow by/gas cutting.
And yes, the Chore Boy (copper) is THE answer to remove leading.
Jacketed should be .429/.430 depending on bullet.
Opening throats to .429” you should by GTG with jacketed.
I would, however, run them at moderate to hot velocities for max accuracy.
If you’re running wimp loads with jacketed, I would use .430”s with a fast powder to be sure they obturate.
A true "Gun Guy" (or gal) should have familiarity and a modicum of proficiency with most all firearms platforms.
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