02-14-2014, 02:11 PM
JASmith Wrote:Why don't you re-check the SAAMI drawing? I just did and could not find the feature you describe. The 0.5 degree reduction in diameter from .2644" to .2677" starts at 1.5478" and ends at1.7025" for a run of 0.1277 inches. That should not produce a 'ring-like' appearance. k.
I don't need to recheck it, I've known what it looks like for 5-6 years.
IF any part of the throat is .264 or larger there will be NO lands. The groove in the barrel is .264. If the reamer removes material .264 or larger it will remove all of the lands making a smooth bore...freebore.
Your numbers are wrong, the area where the lands slope a .5 degrees starts at .2644 and they get taller to .2617. Notice the .2644", that is larger than .264 and will remove all of the lands.