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getting different OAL's each round?

 
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  #1  
Old 04-13-2011, 07:41 PM
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Location: n.w. pennsylvania
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getting different OAL's each round?

Im shooting a 300 wm with berger 190gr vld's.. Using forseter benchrest seater.. use a comparator to measure my rounds and my guns shoots best with an oal of 3.871, my problem is that every time I load a round and measure it... I get a different OAL, anywhere between 3.870 to 3.875...

Should I measure each round and adjust my die till they all measure the same or should I leave the die set in one spot and leave each round a different length??? sorry if this is a dumb question
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Old 04-13-2011, 08:00 PM
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Re: getting different OAL's each round?

i just saw that someone has a similiar post with a 22-250... In my case it is not a compressed load, all of my primers are seated properly... everything on my press is tight.. using a comparator why am I getting different OAL's without moving my die???
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Old 04-13-2011, 08:19 PM
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Re: getting different OAL's each round?

Are you adjusting the die for depth after each one is seated or have you seated at least two bullets without adjusting the die?
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Old 04-13-2011, 08:39 PM
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Re: getting different OAL's each round?

I started out seating with the die in its original place... NOW I'm adjusting the die so that when i measure the length using a comparator I get the same number, I dont know if this is right?
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Old 04-13-2011, 08:45 PM
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Re: getting different OAL's each round?

I read/heard somewhere on some dies the berger bullets are to long and the dies actually push on the tip not around the bullets which can give a differance in lenght.
I checked some of the bergers I had when I was loading them and found they varried in lenght up to 040 thou whinc is alot and one of the reasons I stopped using them
retiredcpo
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Old 04-14-2011, 03:29 AM
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Re: getting different OAL's each round?

Berger has had some issue with the length of the ogive so even if you use a Comp micrometer seater it wouldn't help you need to measure the ogive length and sort them in different batches then when you change batches reset your seater die, I have seen .002"-.006" difference in ogives, hope that helps.
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  #7  
Old 04-14-2011, 05:07 AM
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Re: getting different OAL's each round?

Even the very best custom bullets vary somewhat in length. I don't like the comparator for the very reason you cite. I prefer the Davidson base and nose pieces available from Sinclair. The nose piece stops on the ogive, giving very accurate OAL readings.

With dies equipped with a micrometer top, I like to seat them about .005" or so high. Measure each and set them up in a loading block, mark each line in one thousandths increments. Then lower the mic top one thou at a time to hit the exact OAL right on the mark. If you do not have a seater with mic top, you cannot do this.
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