Thanks @jbell756… I gotta admit, mouthpieces are doing my head in. Seems like we play the mouthpiece, not the trumpet, in so many ways. Every manufacturer i read says to work out the rim you are currently using and then translate it into their rim… But what if you’re not sure about the one (ones) you have? It’s funny that so many mouthpiece manufacturers talk about ‘advanced science’ and ‘new technologies’… well if that’s true it seems like there should be a scientific method for figuring out best fit for the sound you have in mind…