Marcinkiewicz 300 vs Marcinkiewicz 305
The Marcinkiewicz 300 has a wider cup diameter, the Marcinkiewicz 305 features a deeper cup.
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
Marcinkiewicz 300
• Cornet
Backbore—
vs
Mouthpiece B
Marcinkiewicz 305
• Cornet
Backbore—
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.