hornady 140gr bthp

C

cfisel

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I want to load up some hornady 140 gr bthp for my 6.5 creedmore. When I check the col with the gauge, I get 2.634 to the lands. The hornady reload manual says the max is 2.800. I couldn't b that far off could I? When I load 123 gr amax I get just 1/1000 less that the overall length, so I know I'm doing it right. What gives?:confused:
 
The ogive on the amax may be different from the bthp. The key word is max so you can go shorter. The gun may also have a short throat. Is it custom built?
 
If you had a seater die that pushed the bullet down by the portion of the ogive just in front of the full diameter of the bullet then it wouldn't matter what bullet you used, they would all have the same distance to lands. But you don't, so take your highly calibrated eyeball, and mark on your bullets where you first start noticing where the full diameter of the bullet starts to shrink into the front ogive profile.

You should be able to tell if it is 0.167 inches off, but my guess is that surface will be very close to each other. That is the surface that engages the lands, so that is the measurement that matters.

Jimro
 
Are you measuring the COL or the distance to the ogive? The manual is give the distance from the head to the tip and not to the ogive.
 
Smoke a bullet and put it into a fired, un-sized case just barely deep enough for the case to hold the bullet. Close the bolt on it. Eject the brass. tap the bullet out. Put them back together and measure.
Thats the old way of doing it. To me, its much more simple than the new fangled gauges, which I have but rarely use.
 
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