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Rifles, Reloading, Optics, Equipment
Reloading
How accurate should COL be?
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<blockquote data-quote="Varmint Hunter" data-source="post: 557854" data-attributes="member: 313"><p>Something to consider that I didn't notice in previous posts:</p><p></p><p>OAL's can vary due to variable neck tensions. </p><p></p><p>When using reloadable brass it should be sorted by brand and number of times fired to segregate cases with (potentially) various neck tensions. Brass elasticity varies by brand, thickness, work hardening, fouling build up, etc</p><p></p><p>Interior neck cleanliness is important for consistent neck tension.</p><p></p><p>Compressed loads often result in OAL's that vary, at least in my experience.</p><p></p><p>Lastly - if primers are not fully and properly seated you can get incorrect OAL measurements because the caliper blade may be resting on the primer rather than on the case head. Thus, indicating an OAL that is false. You need to look very closely across the case head while the calipers are in place to see this. Use a good backlight.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 557854, member: 313"] Something to consider that I didn't notice in previous posts: OAL's can vary due to variable neck tensions. When using reloadable brass it should be sorted by brand and number of times fired to segregate cases with (potentially) various neck tensions. Brass elasticity varies by brand, thickness, work hardening, fouling build up, etc Interior neck cleanliness is important for consistent neck tension. Compressed loads often result in OAL's that vary, at least in my experience. Lastly - if primers are not fully and properly seated you can get incorrect OAL measurements because the caliper blade may be resting on the primer rather than on the case head. Thus, indicating an OAL that is false. You need to look very closely across the case head while the calipers are in place to see this. Use a good backlight. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How accurate should COL be?
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