Posted: 9/23/2015 10:47:59 AM EDT
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I'm working on load development for my rifle, and using both the 105 A-Max and the 107 SMK. I have my dies set to seat at 0.020" off the lands with the SMK's, but the A-Max when mic'd reflects only a 0.010" jump. Verified by loading a couple more 107's, but the 105's still show a shorter jump. Any ideas? I'm thinking it is just the poly tip on the A-Max versus the OTM of the SMK, but I'm relatively unfamiliar with "match/precision" loading.
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Step 1: Make sure you are measuring from the case head to the ogive, not the projectile tip. You'll need a bullet comparator for that which clips onto your caliper/micrometer.
Step 2: SMKs have a tangent ogive, Amax have a secant ogive. If you switch back and forth without resetting your seating die you will not get consistent jump. Step 2 is true for ALL reloading, you should not switch bullets around without resetting your seating die. On most dies/bullets the seater stem doesn't precisely contact the bullet's ogive, it just contacts some random point on the bullet. |
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Duly noted, thanks for the replies. As i have stated, I'm relatively new to load development from a precision standpoint, and this is the first run at using multiple bullet manufacturers. I was not aware of the variance.
My old Mauser and my AR have only ever had one bullet breed through them from a reloading standpoint. Comparator on the way tomorrow. |