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Rifles, Reloading, Optics, Equipment
Reloading
Bullet seating depth
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<blockquote data-quote="Mikecr" data-source="post: 973406" data-attributes="member: 1521"><p>There a various methods(many threads here) for determining max cartridge base to ogive(CBTO), but I doubt you'll reach it in a factory A-Bolt.</p><p>You could go straight to Berger's seating testing at minus 2% from book max load, with careful measurement and logging of best CBTO. And of course watch for any pressure 'issues' with seating further out..</p><p></p><p>Max COAL, and/or distance to lands(DTL), are just descriptive terms. </p><p>All that really matters is most accurate local CBTO. Go ahead and find that first, and twiddle around with determining DTL, if desired, later.</p><p></p><p>A simple tool for measuring CBTO that works well, is a Sinclair 'nut':</p><p><a href="http://www.sinclairintl.com/reloading-equipment/measuring-tools/bullet-comparators/sinclair-hex-style-bullet-comparators-prod34262.aspx" target="_blank">SINCLAIR HEX STYLE BULLET COMPARATORS | Sinclair Intl</a></p><p>This is a better measure than COAL, and it pays down the road to always use the same tool so that you can always replicate logged dimensions(even with different bullets).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 973406, member: 1521"] There a various methods(many threads here) for determining max cartridge base to ogive(CBTO), but I doubt you'll reach it in a factory A-Bolt. You could go straight to Berger's seating testing at minus 2% from book max load, with careful measurement and logging of best CBTO. And of course watch for any pressure 'issues' with seating further out.. Max COAL, and/or distance to lands(DTL), are just descriptive terms. All that really matters is most accurate local CBTO. Go ahead and find that first, and twiddle around with determining DTL, if desired, later. A simple tool for measuring CBTO that works well, is a Sinclair 'nut': [url=http://www.sinclairintl.com/reloading-equipment/measuring-tools/bullet-comparators/sinclair-hex-style-bullet-comparators-prod34262.aspx]SINCLAIR HEX STYLE BULLET COMPARATORS | Sinclair Intl[/url] This is a better measure than COAL, and it pays down the road to always use the same tool so that you can always replicate logged dimensions(even with different bullets). [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet seating depth
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