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Rifles, Reloading, Optics, Equipment
Reloading
Brass length
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<blockquote data-quote="MNbogboy" data-source="post: 1257303" data-attributes="member: 18849"><p>Measure new brass length, compare to SAAMI specs, do not trim if within tolerance of spec.</p><p></p><p>Measure again after fire forming and resizing...Use guides within this and other forums for proper setup of your sizing dies....Minimizing brass stretch will also minimize your requirement for trimming and increase your brass life...</p><p></p><p>Over length brass becomes a problem if it interferes with chamber dimensions therefore causing difficult chambering and/or overpressures....</p><p></p><p>Under length brass may become a problem if bullets seated closer to the lands leaving less than desireable bearing length.</p><p>Often times under length brass becomes the precurser for carbon rings which can lead to another group of problems.</p><p></p><p>I strive for the longest "safe" neck my chambers allow (usually -.010 of chamber cast or print) and then trim everytime...often little or negligable material is removed. </p><p></p><p>Also if you perform weight and/or volume checks do so after fireforming, sizing and trimming.</p><p></p><p>When working up loads with cannelured bullets often you will fing that best COAL or OGTB will show no relatiomship to the cannelure and end of neck...The cannelures are part of the bullet expansion design and often are used for crimping in hard recoiling rifles but not at</p><p>the optimal place for best precision/accuracy.</p><p></p><p>Trim gauges are nice but your calipers should be adequate for trim length checks.</p><p>I have read where some choose to trim .010-.020 short and don't trim again till they become slightly over....This works too but I only shoot a thousand to 1500 times a year now so I strive for consistency in all my case preparation....</p><p></p><p>Hope this helps,</p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1257303, member: 18849"] Measure new brass length, compare to SAAMI specs, do not trim if within tolerance of spec. Measure again after fire forming and resizing...Use guides within this and other forums for proper setup of your sizing dies....Minimizing brass stretch will also minimize your requirement for trimming and increase your brass life... Over length brass becomes a problem if it interferes with chamber dimensions therefore causing difficult chambering and/or overpressures.... Under length brass may become a problem if bullets seated closer to the lands leaving less than desireable bearing length. Often times under length brass becomes the precurser for carbon rings which can lead to another group of problems. I strive for the longest "safe" neck my chambers allow (usually -.010 of chamber cast or print) and then trim everytime...often little or negligable material is removed. Also if you perform weight and/or volume checks do so after fireforming, sizing and trimming. When working up loads with cannelured bullets often you will fing that best COAL or OGTB will show no relatiomship to the cannelure and end of neck...The cannelures are part of the bullet expansion design and often are used for crimping in hard recoiling rifles but not at the optimal place for best precision/accuracy. Trim gauges are nice but your calipers should be adequate for trim length checks. I have read where some choose to trim .010-.020 short and don't trim again till they become slightly over....This works too but I only shoot a thousand to 1500 times a year now so I strive for consistency in all my case preparation.... Hope this helps, Randy [/QUOTE]
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