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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Freebore in a hunting rifle.
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<blockquote data-quote="velocity-is-key" data-source="post: 503373" data-attributes="member: 32874"><p>AMEN..</p><p> Maybe you can/or someone from this forum can comment on a idea I have thought about when dealing with the shorter barrel and velocity loss..</p><p> I recently chopped off 10 inches of my straight 1.350", 29 inch , 1:8 twist kreiger chambered in 6/284 with a tight neck on a single shot 40X for the practicality of a package that I can tolerate in the field at night with a 5 pound thermal scope and with the 13" long silencer attached.</p><p> In all reality velocity loss was only 200 fps leaving me with a 105 VLD Berger at 3150 fps which is outstanding considering the weight reduction AND oal of that combination afterwards and further more, accuracy was enhanced also all with a 18-5/8" barrel..</p><p> I am building another in that chambering due to the love and experience I have for this cartrIdge and components on hand using a 591 Surgeon..It too will also be suppressed but I will be limited to a detachable mag system determining cartrdge oal and limiting my bullet length also.. Therefore I decided to design the package with lighter more explosive bullets and velocities in mind using a 1:12 twist with one of Bettins carbon graphite bull "24" inch tubes and a modified carbon graphite suppressor to lighten the whole rig wthout sacraficing accuracy. Obvoiusly Im going for speed at moderate distances (5-600 yds)..</p><p>I know that overall longer barrel length will benefit a heavy bullet /powder combo more than a light bullet/powder combo so I think 24" can be a great short barrel length for this setup..</p><p> Lately I have been researching the "freebore" concept and I too believe that in the field and not at the competition bench it may be of a benefit to enhanced velocity with a shorter barrel length being able to load up to a more potent charge with a lengthened not reduced pressure curve to keep pressure tolerable while not sacraficing velocity with the correct powder to benefit this 30-06 cased capacity round...</p><p> I obviously know what I can do to take advantage of this case capacity in building a rig and know I could just shoot a more milder cartrdge like the 6mmAI or alter barrel length..However I'm determined to deal with this combo and get the max and wonder if using Freebore in a setup as this could help me get back the velocity lost in going with the short fat barrellightbulb...</p><p>If anyone out here has had these same demons and experimented, researched or even read about this subject please feel free to vent....It can't be too bad if most of the major firearm builders use this practice whether for the "idiot" proof solution or pressure/velocity solution...</p><p> </p><p> I did the unthinkable once when loading at the range for this rig and while at my near max load I very stupidly but accidently bumped the SC4831 powder and scale up "1 grain" instead of ".1 grain" ..The results were a pierced primer and a case head that could no longer be read as it was mashed smooth, anyway me and the 40x survived but that chrongraph revealed that this 18-5/8 inch barrel yielded a wopping 3450 FPS with the 105 VLD Berger and I was astonished that that powder charge still continued to benefit velocity having thought a portion of it may have burned outside that short barrel...Of course the pressure curve must have been staggering but what if I could smooth it out to a more moderate curve in that short barrel?</p><p> Food for thought...Thank you for all and any response...There is a galactical amount of experience on this sight and I am thankfull for any insight into this understated concept...... </p><p> </p><p> </p><p>velocity</p></blockquote><p></p>
[QUOTE="velocity-is-key, post: 503373, member: 32874"] AMEN.. Maybe you can/or someone from this forum can comment on a idea I have thought about when dealing with the shorter barrel and velocity loss.. I recently chopped off 10 inches of my straight 1.350", 29 inch , 1:8 twist kreiger chambered in 6/284 with a tight neck on a single shot 40X for the practicality of a package that I can tolerate in the field at night with a 5 pound thermal scope and with the 13" long silencer attached. In all reality velocity loss was only 200 fps leaving me with a 105 VLD Berger at 3150 fps which is outstanding considering the weight reduction AND oal of that combination afterwards and further more, accuracy was enhanced also all with a 18-5/8" barrel.. I am building another in that chambering due to the love and experience I have for this cartrIdge and components on hand using a 591 Surgeon..It too will also be suppressed but I will be limited to a detachable mag system determining cartrdge oal and limiting my bullet length also.. Therefore I decided to design the package with lighter more explosive bullets and velocities in mind using a 1:12 twist with one of Bettins carbon graphite bull "24" inch tubes and a modified carbon graphite suppressor to lighten the whole rig wthout sacraficing accuracy. Obvoiusly Im going for speed at moderate distances (5-600 yds).. I know that overall longer barrel length will benefit a heavy bullet /powder combo more than a light bullet/powder combo so I think 24" can be a great short barrel length for this setup.. Lately I have been researching the "freebore" concept and I too believe that in the field and not at the competition bench it may be of a benefit to enhanced velocity with a shorter barrel length being able to load up to a more potent charge with a lengthened not reduced pressure curve to keep pressure tolerable while not sacraficing velocity with the correct powder to benefit this 30-06 cased capacity round... I obviously know what I can do to take advantage of this case capacity in building a rig and know I could just shoot a more milder cartrdge like the 6mmAI or alter barrel length..However I'm determined to deal with this combo and get the max and wonder if using Freebore in a setup as this could help me get back the velocity lost in going with the short fat barrellightbulb... If anyone out here has had these same demons and experimented, researched or even read about this subject please feel free to vent....It can't be too bad if most of the major firearm builders use this practice whether for the "idiot" proof solution or pressure/velocity solution... I did the unthinkable once when loading at the range for this rig and while at my near max load I very stupidly but accidently bumped the SC4831 powder and scale up "1 grain" instead of ".1 grain" ..The results were a pierced primer and a case head that could no longer be read as it was mashed smooth, anyway me and the 40x survived but that chrongraph revealed that this 18-5/8 inch barrel yielded a wopping 3450 FPS with the 105 VLD Berger and I was astonished that that powder charge still continued to benefit velocity having thought a portion of it may have burned outside that short barrel...Of course the pressure curve must have been staggering but what if I could smooth it out to a more moderate curve in that short barrel? Food for thought...Thank you for all and any response...There is a galactical amount of experience on this sight and I am thankfull for any insight into this understated concept...... velocity [/QUOTE]
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