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OAL varies

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Dillon

I have a issue with OAL on 124 9mm FMJ RN, I loaded out my first big run (500) of 9mm and found that the OAL varied from 1.135-1.145
I checked to make sure everything was tight and it was I also checked my resize/decap to make sure it was not hitting the shellplate causing a deflection, I set it up using a case in every station and set the OAL to 1.135 and tightened down the lock ring and verified it at 1.135-1.135.5 I then started pushing rounds thru and a moderate pace and found that the OAL wondered .08-.011 ? am I doing something wrong or is this the best I can expect from a progressive press over a S/S
I also noted some movement in the toolhead as if it was floating both pins are in is there a way to secure the toolhead from moving or is it necessary

Thanks

Have a fired case in the size die when you set up the bullet seating die. this ensures the toolhead is lifted up fully, as it is when actually loading progressively.

Dillon

I did have a case in station 1 as well as every other station and all was well until I started cranking out the rounds and then the OAL started to vary I did notice that the toolhead moves ? is there a way to secure this or is there something I am missing

I am having a similar issue with 40 S&W with the target OAL at 1.120 

Using:

New unfired Remington .40 S&W Brass

Winchester 165 gn TMJ Bullet

I was getting from a 1.106 to 1.125 swing with about 40% on the low side and about 5%on the high side the rest ot 1.119 to 1.121. I followed the Dillon recommendation here and there was some improvement - 20% at 1.116 to 1.123 the rest at 1.119 to 1.122. seems still to be too big of a swing. Im hoping to get any recommendations to get the OAL more repeatable.

 

 

I have exactly the same problem as hookem3.Only difference is I'm using Montana Gold 180s. Is this normal?

Dillon where are you?

FWIW, I ran a few 40S&W last night and found my OAL only varied by about 0.004" total.  I was using 200gr flat point FMJ and used brass with 4 different headstamps, so I would guess there is something wrong with your setups or technique.  Do you have the seating insert oriented correctly for the bullet type you are using?  May not have an effect at all, but just something to verify.  Seems like you guys are getting way too much variation.

Also, I was reading somewhere that the contact point for round nose bullets can vary up to 0.025" due to things like bullet to bullet variation, so maybe your variation isn't really as far out of line as one would think.

Im going to load some more and recheck. Brass is the same with consistent length. Im loading truncated Cone Winchester and there is very lettle variation in length. 

 

Not sure how to orient the seating die any different than the setup.

If you remove the chrome e-clip from the top of the die, the die will fall out the bottom of the housing (place your free hand under the die to catch the die).  The die is composed of three pieces - an outer die housing, a bullet seating insert, and a pin that holds them together.  The pin can only be inserted one way and will fall out easily.  Remove the pin and the seating insert will slide right out.  The bullet seating insert is reversible and can be assembled with either end oriented downward.  One end has a large flat center section and is designed for flat nose bullets while the other end is a more conical shaped and is designed for round nose bullets.  Make sure you have the proper end oriented down for the type of bullet you are using then reassemble the die.

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