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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What benifit does a tight bore barrel have
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<blockquote data-quote="rjb" data-source="post: 32416" data-attributes="member: 1145"><p>In regards to Palma barrels with "tight bore" they are/were come about by the competitors in International Palma matches</p><p>having to use a particular type of "ball 7.62</p><p>ammo" issued in UK more or less. The bullet</p><p>diameter was more like .307 than customary</p><p>.308 in USofA. Current NRA rules in U.S. allow Palma competitors to use 155 Sierras etc. that are .308 dia. The real "Tight Bore" barrels are changed to suit. There is some advantage in barrels over 30 inches long to have a (very) slight "choke bore" i.e. the chamber end starts out ~0.308 and at muzzle bore may be 0.3075. Takes skilled barrelsmith to lap that bore. rjb</p><p></p><p>[ 03-16-2004: Message edited by: rjb ]</p></blockquote><p></p>
[QUOTE="rjb, post: 32416, member: 1145"] In regards to Palma barrels with "tight bore" they are/were come about by the competitors in International Palma matches having to use a particular type of "ball 7.62 ammo" issued in UK more or less. The bullet diameter was more like .307 than customary .308 in USofA. Current NRA rules in U.S. allow Palma competitors to use 155 Sierras etc. that are .308 dia. The real "Tight Bore" barrels are changed to suit. There is some advantage in barrels over 30 inches long to have a (very) slight "choke bore" i.e. the chamber end starts out ~0.308 and at muzzle bore may be 0.3075. Takes skilled barrelsmith to lap that bore. rjb [ 03-16-2004: Message edited by: rjb ] [/QUOTE]
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What benifit does a tight bore barrel have
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