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Long Range Hunting & Shooting
A MAX and Partition OAL question
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<blockquote data-quote="FearNoWind" data-source="post: 1251683" data-attributes="member: 50867"><p>First we need to distinguish between OAL and CBTO. OAL technically refers to the length between the base and the bullet tip. CBTO is the "OAL" from the base to the bullet's ogive. If you intend to work with lengths of loaded rounds you're best bet is to obtain the equipment to measure CBTO. If you already have that equipment, combine that gear with a comparator.</p><p></p><p><a href="http://www.brownells.com/reloading/measuring-tools/bullet-seating-depth-tools/lock-n-load-oal-gauge-straight--sku829200000-70272-30424.aspx" target="_blank">Lock-N-Load OAL Gauge (Straight) : LENGTH GAUGE | Brownells</a></p><p></p><p><a href="http://www.brownells.com/reloading/measuring-tools/bullet-comparator-inserts/sinclair-insert-style-bullet-comparator-prod34014.aspx" target="_blank">SINCLAIR INSERT STYLE BULLET COMPARATOR | Brownells</a></p><p></p><p>Once you've determined chamber length you'll know where the ogive of the bullet touches the lands. From that point you can work backwards to determine how much "jump" you want to apply to the loaded round. </p><p>Before you go too far, I'd recommend spending a few hours reading all you can about the relationship between primers, powder charges, primers, neck tension, and bullet seating depths.</p><p></p><p><a href="http://www.sinclairintl.com/books-videos-software/books/books-magazines/applied-ballistics-by-bryan-litz-prod42961.aspx" target="_blank">APPLIED BALLISTICS BY BRYAN LITZ | Sinclair Intl</a></p><p></p><p><a href="http://www.nosler.com/blog/news-and-articles/2013/6/4/beyond-the-basics-developing-your-own-loads" target="_blank">Beyond the Basics: Developing Your Own Loads</a></p><p></p><p><a href="http://www.sinclairintl.com/GunTech/The-Importance-of-Bullet-Seating-Depth/detail.htm?lid=16085" target="_blank">The Importance of Bullet Seating Depth |</a></p></blockquote><p></p>
[QUOTE="FearNoWind, post: 1251683, member: 50867"] First we need to distinguish between OAL and CBTO. OAL technically refers to the length between the base and the bullet tip. CBTO is the "OAL" from the base to the bullet's ogive. If you intend to work with lengths of loaded rounds you're best bet is to obtain the equipment to measure CBTO. If you already have that equipment, combine that gear with a comparator. [url=http://www.brownells.com/reloading/measuring-tools/bullet-seating-depth-tools/lock-n-load-oal-gauge-straight--sku829200000-70272-30424.aspx]Lock-N-Load OAL Gauge (Straight) : LENGTH GAUGE | Brownells[/url] [url=http://www.brownells.com/reloading/measuring-tools/bullet-comparator-inserts/sinclair-insert-style-bullet-comparator-prod34014.aspx]SINCLAIR INSERT STYLE BULLET COMPARATOR | Brownells[/url] Once you've determined chamber length you'll know where the ogive of the bullet touches the lands. From that point you can work backwards to determine how much "jump" you want to apply to the loaded round. Before you go too far, I'd recommend spending a few hours reading all you can about the relationship between primers, powder charges, primers, neck tension, and bullet seating depths. [url=http://www.sinclairintl.com/books-videos-software/books/books-magazines/applied-ballistics-by-bryan-litz-prod42961.aspx]APPLIED BALLISTICS BY BRYAN LITZ | Sinclair Intl[/url] [url=http://www.nosler.com/blog/news-and-articles/2013/6/4/beyond-the-basics-developing-your-own-loads]Beyond the Basics: Developing Your Own Loads[/url] [url=http://www.sinclairintl.com/GunTech/The-Importance-of-Bullet-Seating-Depth/detail.htm?lid=16085]The Importance of Bullet Seating Depth |[/url] [/QUOTE]
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