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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
tight neck ?
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<blockquote data-quote="Centre Punch" data-source="post: 64808" data-attributes="member: 3048"><p>Hi alg,</p><p>Tight necks do not offer a truly big advantage over saami specs, but to me would be desirable in a custom barrel.</p><p></p><p>Firstly i would describe tight necks as "any that are tighter than saami specs", and the ultra tight .001" to .0015" clearance necks on bench guns as "fitted necks".</p><p></p><p>Saami spec, necks are cut to provide ample clearance for all brands and maximum size deviations of factory ammo. This means that a neck cut to minimum saami spec. will still be bigger then a cartridge manufactured maximum spec and in an extreme case you could have a max spec saami chamber and neck and a minimum spec cartridge, giving you massive clearance as much as .040" has been recorded, /ubbthreads/images/graemlins/shocked.gif not very productive towards accuracy and case life.</p><p></p><p>A tight neck in your 6.5-284 will help alignment of the cartridge in the chamber and aid straight bullet engagement into the rifling, thus increasing accuracy. Case life will also be extended.</p><p></p><p>Find out from your smith what size neck his reamer cuts and aim for a clearance of .003" to .004" for a tight neck, he may be able to cut you a neck which gives you the desired clearance, without you needing to outside neck turn your cases. Alternatively you could have minimum saami spec chamber cut and form your cases from 284 brass, which could also give you the desired clearance, with the very high quality Norma and Lapua brass available i would advise a tight neck as described above. Either way i think a bit of neck turning is in order. /ubbthreads/images/graemlins/wink.gif </p><p></p><p>Ian.</p></blockquote><p></p>
[QUOTE="Centre Punch, post: 64808, member: 3048"] Hi alg, Tight necks do not offer a truly big advantage over saami specs, but to me would be desirable in a custom barrel. Firstly i would describe tight necks as "any that are tighter than saami specs", and the ultra tight .001" to .0015" clearance necks on bench guns as "fitted necks". Saami spec, necks are cut to provide ample clearance for all brands and maximum size deviations of factory ammo. This means that a neck cut to minimum saami spec. will still be bigger then a cartridge manufactured maximum spec and in an extreme case you could have a max spec saami chamber and neck and a minimum spec cartridge, giving you massive clearance as much as .040" has been recorded, [img]/ubbthreads/images/graemlins/shocked.gif[/img] not very productive towards accuracy and case life. A tight neck in your 6.5-284 will help alignment of the cartridge in the chamber and aid straight bullet engagement into the rifling, thus increasing accuracy. Case life will also be extended. Find out from your smith what size neck his reamer cuts and aim for a clearance of .003" to .004" for a tight neck, he may be able to cut you a neck which gives you the desired clearance, without you needing to outside neck turn your cases. Alternatively you could have minimum saami spec chamber cut and form your cases from 284 brass, which could also give you the desired clearance, with the very high quality Norma and Lapua brass available i would advise a tight neck as described above. Either way i think a bit of neck turning is in order. [img]/ubbthreads/images/graemlins/wink.gif[/img] Ian. [/QUOTE]
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tight neck ?
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