Why bother? I took about 1/8 inch off mine with a dremel tool, down to the point even with the top of the hammer extension. Three of my barrels have scopes on low mounts and they all clear, it doesn't have to be by much at all as long as nothing moves, in which case you have other, bigger, problems. Also look at how you are sighting the rifle. If you have to lean your head forward or "crawl" the stock your scope is too far forward and the enlarged portion of the rear of the scope may be within the arch of the hammer. Try moving the scope to the rear to clear the hammer and give you a more natural shooting position.
