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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fast and slow barrels (or is it chambers)?
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<blockquote data-quote="Dave King" data-source="post: 36490" data-attributes="member: 3"><p>On 24Hourcampfire there's a thread having to do with fast and slow barrels (myth or fact essentially). On fella suggested that it may be the chamber in conjunction with the barrel... I got to thinking (yup... a problem as many of you know) about my past experiences with rifles and different chambers reamers. Anyway...</p><p></p><p>This premise that a chamber has a bit to do with fast and slow had me in a tizzy for a bit (itching to try it) so I ran out and tested some ammo in two different rifles. Here are the results:</p><p></p><p></p><p>The rifles (barrels and chambers)</p><p></p><p>Rifle 1:</p><p></p><p> Rem 700 Custom, <strong>Match chamber</strong> (not tight neck), 24" Mike Rock 1x11.15 barrel.</p><p></p><p>Rifle 2:</p><p></p><p> Rem 40X Custom, <strong>7.62 NATO chamber</strong>, 26" Hart 1x12 barrel.</p><p></p><p></p><p>The ammunition (same lot fired from both rifles. both barrels pre-fired (warmed))</p><p></p><p> Ammo 1:</p><p></p><p> Federal Gold Medal Match 168's (308 Win)</p><p></p><p> Ammo 2:</p><p></p><p> Military 7.62MM Long Range M118 (175 Sierra Match King)</p><p></p><p></p><p> Oehler at 6" from muzzle (center screen)</p><p></p><p> Rifle 1 (24" barrel,match chamber)</p><p></p><p> GMM 168 average speed 2744fps (StDev=16.8fps)</p><p> M118LR average speed 2717fps (StDev = 26fps)</p><p></p><p> Rifle 2 (26" barrel, 7.62NATO chamber)</p><p></p><p> GMM 168average speed 2661fps (StDev=19.8fps)</p><p> M118LR average speed 2639fps (StDev=19.2fps)</p><p></p><p> </p><p> Observed: The rifle with the <strong>24" barrel</strong> produced speeds <strong>84 fps faster</strong> with the GMM 168s than the rifle with the 26" barrel.</p><p></p><p> The rifle with the <strong>24" barrel</strong> produced speeds <strong>78 fps faster</strong> with the M118LR than the rifle with the 26" barrel.</p><p></p><p> The 40X rifle (26" barrel) showed the faster bullet to be the GMM 168s by 22 fps.</p><p></p><p> The Custom Rem 700 (24" barrel) showed the faster bullet to be the GMM 168s by 28 fps.</p><p></p><p></p><p> What are the groups thoughts on these data???</p><p></p><p>[ 10-17-2004: Message edited by: Dave King ]</p></blockquote><p></p>
[QUOTE="Dave King, post: 36490, member: 3"] On 24Hourcampfire there's a thread having to do with fast and slow barrels (myth or fact essentially). On fella suggested that it may be the chamber in conjunction with the barrel... I got to thinking (yup... a problem as many of you know) about my past experiences with rifles and different chambers reamers. Anyway... This premise that a chamber has a bit to do with fast and slow had me in a tizzy for a bit (itching to try it) so I ran out and tested some ammo in two different rifles. Here are the results: The rifles (barrels and chambers) Rifle 1: Rem 700 Custom, [B]Match chamber[/B] (not tight neck), 24" Mike Rock 1x11.15 barrel. Rifle 2: Rem 40X Custom, [B]7.62 NATO chamber[/B], 26" Hart 1x12 barrel. The ammunition (same lot fired from both rifles. both barrels pre-fired (warmed)) Ammo 1: Federal Gold Medal Match 168's (308 Win) Ammo 2: Military 7.62MM Long Range M118 (175 Sierra Match King) Oehler at 6" from muzzle (center screen) Rifle 1 (24" barrel,match chamber) GMM 168 average speed 2744fps (StDev=16.8fps) M118LR average speed 2717fps (StDev = 26fps) Rifle 2 (26" barrel, 7.62NATO chamber) GMM 168average speed 2661fps (StDev=19.8fps) M118LR average speed 2639fps (StDev=19.2fps) Observed: The rifle with the [B]24" barrel[/B] produced speeds [B]84 fps faster[/B] with the GMM 168s than the rifle with the 26" barrel. The rifle with the [B]24" barrel[/B] produced speeds [B]78 fps faster[/B] with the M118LR than the rifle with the 26" barrel. The 40X rifle (26" barrel) showed the faster bullet to be the GMM 168s by 22 fps. The Custom Rem 700 (24" barrel) showed the faster bullet to be the GMM 168s by 28 fps. What are the groups thoughts on these data??? [ 10-17-2004: Message edited by: Dave King ] [/QUOTE]
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Fast and slow barrels (or is it chambers)?
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