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Hunting
Long Range Hunting & Shooting
FREEBORE ON WEATHERBYS
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<blockquote data-quote="DANTEC" data-source="post: 2291" data-attributes="member: 685"><p>free bore on Weatherby came to solve the problem of powder burning rate in the 50's and 60's there is "gap" in burning rate powder from the slowest available in rifle rate as 4831 powder and the very slow powders of 50 BMJ </p><p></p><p>to try to keep pressure level acceptable ( pressure increase when bullet force in grooves that name ingraving force in internal balistic and this is because when load are in the land pressure are highter tahn with same load of the land ) and get "Weatherby" velocity , deep free bore help to don't rise the pressure curve over safety level with powder burning rate fast ( for the use ) </p><p></p><p>that because after Norma have develop the MRP powder ( specialy design for Weatherby case load ) and now most company have fill the gap between 4831 and 50 BMJ powder ( H1000 , IMR 7828 , RETUMBO , RL22 and RL25 , VITA N165 and N170 ... ) </p><p></p><p>If you check other caliber European you can see that old calibers ( 7x64 6.5x55 .... ) have very deep throat for the same problem of powder ( design in the beginning of the 20° century ).</p><p>I have own a 6.5x57 Zoli rifle ( very inaccurate gun ) with a free bore so deep that a 155 SMK seat out doesn't sucess to touch the grooves .....and CIP chambering are not the best in accuracy ...</p><p></p><p>flat base are more accurate because they are longer on drive band ( cylindral part of the bullet ) and stay more longer in the neck before to reach ( at least ) the grooves . </p><p></p><p>so Weatherby rifle are not target rifle and this is not the way to try to compare Hunting rifle accuracy to match/target/BR rifle accuracy .</p><p></p><p>By tuning the load and good powder they can get good accuracy and far enought to take game .</p><p></p><p>Good shooting</p><p></p><p>DAN TEC</p></blockquote><p></p>
[QUOTE="DANTEC, post: 2291, member: 685"] free bore on Weatherby came to solve the problem of powder burning rate in the 50's and 60's there is "gap" in burning rate powder from the slowest available in rifle rate as 4831 powder and the very slow powders of 50 BMJ to try to keep pressure level acceptable ( pressure increase when bullet force in grooves that name ingraving force in internal balistic and this is because when load are in the land pressure are highter tahn with same load of the land ) and get "Weatherby" velocity , deep free bore help to don't rise the pressure curve over safety level with powder burning rate fast ( for the use ) that because after Norma have develop the MRP powder ( specialy design for Weatherby case load ) and now most company have fill the gap between 4831 and 50 BMJ powder ( H1000 , IMR 7828 , RETUMBO , RL22 and RL25 , VITA N165 and N170 ... ) If you check other caliber European you can see that old calibers ( 7x64 6.5x55 .... ) have very deep throat for the same problem of powder ( design in the beginning of the 20° century ). I have own a 6.5x57 Zoli rifle ( very inaccurate gun ) with a free bore so deep that a 155 SMK seat out doesn't sucess to touch the grooves .....and CIP chambering are not the best in accuracy ... flat base are more accurate because they are longer on drive band ( cylindral part of the bullet ) and stay more longer in the neck before to reach ( at least ) the grooves . so Weatherby rifle are not target rifle and this is not the way to try to compare Hunting rifle accuracy to match/target/BR rifle accuracy . By tuning the load and good powder they can get good accuracy and far enought to take game . Good shooting DAN TEC [/QUOTE]
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FREEBORE ON WEATHERBYS
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