how have i managed to screw this up ?

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nova_scotian_guy

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ok so i dont know if its user error or equipment error ..... im thinking its more twords user

so i have have 10 projectiles all the same length 10 shells all the same length primers are all flush and using same amount of powder in each i have my bullet setting die to set the depth so the overall length is 3.800 ... how is it possible that all 10 shells run from 3.792-3.808 im using the same amount of pressure each time
 
Your are not real clear on your procedure, but your seating die seats against the ogive (or at least some part of it), and bullets are not precisely the same. Therefore your OAL should not be expected to be the same.
 
Thats a very small deviation in OAL and not likely to be an issue unless you have magazine length considerations.

Methinks your measuring base of the case to the point of the bullet. You will almost always find that variation meassuring like that. Measure Base of case to the OJIVE of the bullet using a comparator.
 
JayCarver said:
It's because the tips aren't very consistant, especially with SMK's. I bet if you measured to the ojive it would be within a couple thou.
Click to expand...

If the most likely answer. If you measure the length of 10 bullets, you'll probably see spread similar to the varying OAL. Heck, just a close visual inspection ought to show variations in the meplet.
 
Here we go again!
Most of the trouble that new reloaders have is connected to that completely useless figure given in reloading manuals, Cartridge Over All Length.
IGNORE IT!
It serves no purpose whatsoever, except to confuse newer reloaders, and sometimes not so new reloaders.
 
Pull you seating stem out and see where it is contacting the bullet. If the bullets are pointy it maybe the seating stem is not making contact with the ogive and seating against the tip of the bullet which will produce more inconsistency.

Also your there is some variation between comparator and seating stems. The video below explains it a lot better than I can just typing. If you don't have a comparator get one very useful tool for a reloader IMO.
 
Dont worry about OAL aside from fitting in a magazine. That is the only time you need to consider measuring off the tip of the bullet. Measuring from base to ogive is what counts. The ogive engages the rifling, not the bullet tip. A bullet comparator set is a very good investment for those doing any precision reloading.
 
Sierra tells me there can be a 20 thou variation in bullet length in the same box, because of the way a hollow point bullet is made. But they hold a tight tolerance on the ogive, which is where the seater dies pushes.

if your OAL was consistent, you would be seating them wrong.
 
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