romulus: can you call attention to anyone in particular?

i looked into this topic recently and if i were to eventually purchase a break the symmetry of the venting will be important to me. i have seen many brakes that have the bottom devoid of venting to prevent the gases from kicking up debris but on the same brake have a vent on the top; i would imagine this to impact accuracy in a negative manor but maybe it is negligible? i also stumbled upon an article that mentioned some ideal tolerances for the bore of the break in relation to the bullet calibur.

curious to anyone's experience good, bad or indifferent with breaks to help shape some of our decisions.