OK....fairly new to reloading and have been getting variations in my OAL up to 0.010"!!!!
Wasn't sure if this was even a big deal and, if it was, not sue what the cause may be.
Here's some info I found and thought I'd share.
First off, I've done tons of searching on this forum have have found this topic discussed regarding other brand presses and dies and the consensus seems to be this this is not a really huge issue as long and the seating depth is not to deep as to cause an unsafe increase in pressure. Also, I've read that the bullets I'm using are not the best quality.
Here's the load that I'm currently using for 40 S&W:
Berry's Plated RS 180 gn
5.4 WSF
mixed brass
CCI #500 primers
OAL 1.135 (ish)
I started to think the Lee may be able to provide some insight on this issue since they are called Lee "Presicion" and their press and die set are giving my a fairly large variance in OAL (even with low quality bullet). Here's what I've gotten from Lee:
There are a number of possible causes for overall length variation. One is the way it is measured. If you measure overall length from the tip of the bullet to the base of the case, remember to subtract the variation due to bullet length tolerance. The bullets will vary in length due to manufacturing tolerances (bullets with exposed lead noses are the worst in this regard) and this will add to the overall cartridge length variation. Remember that the bullet seater plug does not (or shouldn't) contact the tip of the bullet when seating, but contacts farther down the ogive. For a more accurate seating depth measurement, take the seater plug out of the bullet seating die, place it on top of the cartridge and measure from the base of the case to the top of the seater plug.
So, it does sound like it may be largely due to the bullet I'm using!!!!
Well, as a new reloader, I just thought I'd share the info I found.
Happy (and safe) reloading!!!!
-tisch