Rklenke wrote:That's a pretty useful picture. I don't have a comparator, but it makes sense that the ogive is seated to that distance. I'm assuming that's a bullet seated backward? How did it shoot?
Correct, IIRC, it is a 300gr SST/ML (FTX) backwards. The flatter the base, the more accurate the reading. IE don't use a boat tail bullet or one with a large radius at the edge of the base. I did not create a load using it that way, the image was from a thread discussing how to determine the length of freebore (throat) in any given brand of barrel. Not to be confused with
leade. Leade is the short distance after the freebore (throat) that is where it tapers down to the actual bore (lands and grooves). Those two transitions are very identifiable in the SAAMI drawing for the chamber reamer.
Available on their web page The 300gr SST/ML has a small amount of radius at the corners of the base, so it does go into the leade slightly, before stopping. That's why my reading of 1.96 is in excess of the SAAMI spec for the freebore (throat) by ≈.06
Here's a tip folks: When you want to search for something specific on this forum, for heaven's sake, use Google not the internal search engine, even though the latter has gotten better in recent years. All you need to do with Google is point it to this forum by preceding your search term(s) with site:450bushmaster.net
IE site:450bushmaster.net "distance to lands" The quotation marks make Google search for that exact expression, not every post with any or all of those words in it. Use the quotation marks prudently however. That example search yielded 9 results. It did not yield the 5 results with distance to
the lands since that was not the exact expression. Without quotation marks the search yields 35 posts.
Hoot
PS: those Missouri bullets cited by Al while working properly in the 45LC, would pose a challenge getting the right seating depth (if at all) that would allow them to survive the ride up the feedramp, past the barrel extension and into the chamber in our uppers. Not saying it can't be done, but if it could, it would probably take a specific COL determined through experimentation.