NoNonsense....

I now understand this point. I was incorrectly using the term Ogive to strictly refer to the point where the taper of the bullet intersected the bearing surface of the bullet

quote:quote:Originally posted by nononsense
ECC,

Just for the sake of clarity, let's cover a couple of terms being batted around in these dialogues:

Ogive = for our uses, this is the curved surface of the bullet from the shank diameter (groove diameter) to the tip of the bullet. Ogives are described by the type of curve (Secant and Tangent) and the degree of the curve based on a ratio of form, often assigned simple numbers such 2 through 12. See example below:



Simplistically, the bigger the Ogive number, the longer and more severe the curve.

Comparator = a ground bushing of a specific diameter which is slightly undersized from the shank diameter or groove diameter (caliber) of the bullet. This measures the diameter of a bullet as close to the junction of the shank and ogive as possible.

Solid or mono-metallic bullets are necessarily longer as compared to the standard cup and lead core bullets due to the use of lighter material used to make those bullets. The bullet has to be longer to achieve the same weight as the standard cup and lead core bullets. See example below:



I tried to size the two images to be the same diameter (width) so that the difference in height was correct or as close as I can get it this late at night. [:D]

Now, if we look at the that intersection of the ogive and the shank diameter, we get this:



Note the difference in length...

Then note the difference in the shape of the Ogive...

This is the best I can do without some sleep and a fresh look tomorrow. Mull this over and let's try it again in the morning.

Best.





Now let me ask you another question...the variation I'm seeing must be due to the die using a smaller diameter than the actual comparator diameter...and thus the shape of the bullet between those two points is giving me my variance in seating depth.?.?

I was told by a RCBS tech that their dies seated of the Ogive (as I understood the term) and if that were the case, I could not understand why I was getting a variation...but if their dies seat off a smaller diameter than my comparator, I can now see where the variance is coming from.

Thank you once again for taking the time to educate the uneducated![:)]