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Rifles, Reloading, Optics, Equipment
Reloading
What first? Powder or seating depth?
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<blockquote data-quote="rscott5028" data-source="post: 557870" data-attributes="member: 24624"><p>I use the Hornady inserts for measuring OAL rather than Sinclair. But, the principle is the same. </p><p> </p><p>I just pulled 5 random 142 SMKs and measured from base to ogive using the #26 insert and the bullets varied less than .001". </p><p> </p><p>Then, I repeated the procedure on the same 5 bullets using the #25 followed by the #24 inserts with the same results. The maximum variation in distance between the #26 datum line and the #25 was .001". Same for #26 to #24 variation. </p><p> </p><p>I repeated the process with 105 Bergers and got the same results. </p><p> </p><p>Anyone can do this at home and decide for themselves. Just make sure you've got good instruments and technique. </p><p> </p><p>Given that I have confirmed that my bullets are uniform...</p><p> </p><p>Some possibilities that might cause me to end up with more than .001" ES in OAL after seating these bullets might be: (as measured from case head to the datum line on the ogive approximating the ID of the lands)</p><p>- seater resting on bullet tip with irregular meplat rather than contacting ogive</p><p>- slop and/or flex in the dies and/or press</p><p>- inconsistent press operation</p><p>- case or case head not square</p><p>- too much or irregular neck tension</p><p>- compressed load</p><p>- other?</p><p> </p><p>It's that simple. </p><p> </p><p>-- Richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 557870, member: 24624"] I use the Hornady inserts for measuring OAL rather than Sinclair. But, the principle is the same. I just pulled 5 random 142 SMKs and measured from base to ogive using the #26 insert and the bullets varied less than .001". Then, I repeated the procedure on the same 5 bullets using the #25 followed by the #24 inserts with the same results. The maximum variation in distance between the #26 datum line and the #25 was .001". Same for #26 to #24 variation. I repeated the process with 105 Bergers and got the same results. Anyone can do this at home and decide for themselves. Just make sure you've got good instruments and technique. Given that I have confirmed that my bullets are uniform... Some possibilities that might cause me to end up with more than .001" ES in OAL after seating these bullets might be: (as measured from case head to the datum line on the ogive approximating the ID of the lands) - seater resting on bullet tip with irregular meplat rather than contacting ogive - slop and/or flex in the dies and/or press - inconsistent press operation - case or case head not square - too much or irregular neck tension - compressed load - other? It's that simple. -- Richard [/QUOTE]
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Forums
Rifles, Reloading, Optics, Equipment
Reloading
What first? Powder or seating depth?
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