What if he's shooting conicals from a TC inline?

Rifle still doesn't matter? Nothing is black and white when it comes to a ML.

Stainless barrel/black stock?

You're close. Please share your loads and we may offer a suggestion.

I shoot BH 209 and the gets more accurate after a couple of shots. All other powders I swap between every shot when shooting sabots. For Conicals, I swab about every 5 shots or so. It really depends.

Lots of variables. The only shot that really maters to a hunter is # 1.

I usually get 2-3 inches at the range and 1 inch groups or less on the internet

Exactly . No truer words were ever spoken