Actually the beer can shims work best on rods, where there might be a .010" to .020" thickness of shim between the rod and the cap. The thin ones are used to tweak the final clearance, but those soft Babbit rod bearings need adjusting often enough that they are usually rough-finished with plenty of shim pack between the rod and cap before the initial bore is cut. I've got some New Old Stock military 235 rods with a single .020" shim between each side of the rod and cap. The rod is bored to standard diameter with the shims in place. As the rod wears, they get replaced with a feather shim that's peeled away a thousandth or so at a time to compensate for wear.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!