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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Acceptable Variation in Bullet Base to Ogive and OAL
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<blockquote data-quote="Rardoin" data-source="post: 1959224" data-attributes="member: 114954"><p>You may be best served, depending on precision you desire, by sorting the bullets base to ogive and placing them into lots of at most 0.004" variation. I sort most factory produced match bullets and group them to lots with 0.003" spread for 600/1000yd matches. What you are seeing is not uncommon. It is why, if I have a favored bullet I know I will shoot out a barrel with, I buy enough in the same lot # to last that barrel's remaining lifespan. Otherwise one has to deal with inter-lot variation as you are seeing. Even some of Berger's most popular match bullets, the 105 hybrid, 108 vld, and 140 hybrid, has shown me inter lot variance of over 0.015" at times.</p><p></p><p>PS- One anomaly I have found is the Hornady 190 A-tip. I have three different lot numbers and nearly all of the ones I measured, which is a couple of hundred, fall within 0.001" BTO with a couple 0.0015" BTO...which is in the margin of error of my caliper/insert/technique. Sure shocked me to say the least.</p></blockquote><p></p>
[QUOTE="Rardoin, post: 1959224, member: 114954"] You may be best served, depending on precision you desire, by sorting the bullets base to ogive and placing them into lots of at most 0.004" variation. I sort most factory produced match bullets and group them to lots with 0.003" spread for 600/1000yd matches. What you are seeing is not uncommon. It is why, if I have a favored bullet I know I will shoot out a barrel with, I buy enough in the same lot # to last that barrel's remaining lifespan. Otherwise one has to deal with inter-lot variation as you are seeing. Even some of Berger's most popular match bullets, the 105 hybrid, 108 vld, and 140 hybrid, has shown me inter lot variance of over 0.015" at times. PS- One anomaly I have found is the Hornady 190 A-tip. I have three different lot numbers and nearly all of the ones I measured, which is a couple of hundred, fall within 0.001" BTO with a couple 0.0015" BTO...which is in the margin of error of my caliper/insert/technique. Sure shocked me to say the least. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Acceptable Variation in Bullet Base to Ogive and OAL
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