Lately I have been using Reaves Goehrings cast sights. They require a little more filing than most, but you can turn them
into a real neat, low sight. You will end up with about a .050 deep dovetail. On the other hand, to answer your question, most of the sights commonly sold....brass or steel base with a silver or brass blade, have a base about .090 -
.100 thick. It should not create a problem on the barrel to inlet those sights that deep, after all, by the time the ball gets
out to the muzzle, your pressures have dropped off drastically. Like so many things, common sense has to prevail at
times. Buy a caliper and do some measuring before you cut...............Don