It's hard to be that precise drilling a ramrod hole so I never try to get it to 1/8" at the lock bolt, fearing it will be less. I don't like notching the front lock bolt. A user who does not know that has been done will not remove the ramrod, try to remove the bolt, and bugger everything up. Notching the barrel is a possibility with a thin web but that puts the lock nose high, which may or may not help the lock tail lie where I want it.
I am most concerned about the web thickness at the muzzle. I don't like ramrods hanging out way beneath the nosecap. I make my ramrods to swell there, but if too thick a web is made at the muzzle, I'd need a 5/8" swell and that wouldn't work well with a .45, LOL.