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Hunting
Long Range Hunting & Shooting
Neck sizing and case getting harder to pull out?
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<blockquote data-quote="Greyfox" data-source="post: 1509457" data-attributes="member: 10291"><p>I think one of the issues that can be encountered are the differences between the brands of brass, ie. Winchester Brass is thinner by as much as .002" compared to Lapua. Thickness can also vary between different lots of the same brand. This does seem to have an effect on sizing behavior and dye selection. This does need to be understood initially, or when changing brands or lots. A while back, I tested a couple of my most used rifles(6.5x47L and 6.5x284 both with custom barrels, loaded to just below max pressure). I was looking for FL and NS differences in velocity, ES, accuracy, and long range POI with fire formed brass. One set, full length sized using a FL Redding bushing dye that was adjusted to setting the shoulder back .0015". These loads were compared to a second set, NS loads using the same lot of Lapua Brass using a Redding neck sizing dye with the same bushing. Neck sizing only, I would experience tight bolt close/lift after 3-4 firings. Shoulders would expand about .0015" with each firing. At 3-4 firings, the neck sized brass need to be FL length sized to restore ease of chambering. With this degree of sizing FL and NS, I could not see a material difference in accuracy velocity, ES, or brass life. My accuracy standards are<.5MOA shot accuracy and <15 FPS ES for 10 shots. As of late, I only FL size to .0015-.002" head space on a routine basis. As a side note, I have not found it neccessary to anneal Lapua Brass with these barrels. Both barrels have +1000 shots each fired.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1509457, member: 10291"] I think one of the issues that can be encountered are the differences between the brands of brass, ie. Winchester Brass is thinner by as much as .002” compared to Lapua. Thickness can also vary between different lots of the same brand. This does seem to have an effect on sizing behavior and dye selection. This does need to be understood initially, or when changing brands or lots. A while back, I tested a couple of my most used rifles(6.5x47L and 6.5x284 both with custom barrels, loaded to just below max pressure). I was looking for FL and NS differences in velocity, ES, accuracy, and long range POI with fire formed brass. One set, full length sized using a FL Redding bushing dye that was adjusted to setting the shoulder back .0015”. These loads were compared to a second set, NS loads using the same lot of Lapua Brass using a Redding neck sizing dye with the same bushing. Neck sizing only, I would experience tight bolt close/lift after 3-4 firings. Shoulders would expand about .0015” with each firing. At 3-4 firings, the neck sized brass need to be FL length sized to restore ease of chambering. With this degree of sizing FL and NS, I could not see a material difference in accuracy velocity, ES, or brass life. My accuracy standards are<.5MOA shot accuracy and <15 FPS ES for 10 shots. As of late, I only FL size to .0015-.002” head space on a routine basis. As a side note, I have not found it neccessary to anneal Lapua Brass with these barrels. Both barrels have +1000 shots each fired. [/QUOTE]
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Neck sizing and case getting harder to pull out?
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