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Rifles, Reloading, Optics, Equipment
Reloading
bullet jam
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<blockquote data-quote="Varmint Hunter" data-source="post: 109142" data-attributes="member: 313"><p>[ QUOTE ]</p><p> so y dose it matter if you have 2 tho or 10 thou of jam </p><p></p><p>[/ QUOTE ] </p><p></p><p>Yes it does. Typically peak pressure rises as "jam" is increased. Also different rifle/bullet combinations perform better with more, less or no rifling engagement. It is a trial and error proposition.</p><p></p><p>I have a 6.5x284 that wouldn't shoot the 142gr SMK's very well until I tried .015" of crush fit. At .015" the groups tightened considerably.</p><p></p><p>If you are loading for a hunting rifle, I wouldn't use the "jam" fit at all. You will most likely find a suitable load with bullets loaded off the rifling as they should be for a hunting rifle.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 109142, member: 313"] [ QUOTE ] so y dose it matter if you have 2 tho or 10 thou of jam [/ QUOTE ] Yes it does. Typically peak pressure rises as "jam" is increased. Also different rifle/bullet combinations perform better with more, less or no rifling engagement. It is a trial and error proposition. I have a 6.5x284 that wouldn't shoot the 142gr SMK's very well until I tried .015" of crush fit. At .015" the groups tightened considerably. If you are loading for a hunting rifle, I wouldn't use the "jam" fit at all. You will most likely find a suitable load with bullets loaded off the rifling as they should be for a hunting rifle. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
bullet jam
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