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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Freebore in a hunting rifle.
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<blockquote data-quote="backwoods83" data-source="post: 503157" data-attributes="member: 29890"><p>Ok I'll correct you, depending on the manufacturer a typical 300wm has .060-.100" freebore. And most of the post are bs, gary has it rigth the .361" freebore in weatherby mags is to prevent an enormous pressure spike when using factory weatherby ammo loaded upwards of 75k psi. When ole man weatherby started these (drag car) rifles surplus Imr 4350 was about the slowest powder available so they were loaded hot as hell and given extra freebore to prevent injury. Its fact that if you use the same bullet, case, primer, and powder charge, seat 1 .005" in the lands and another .005 off the lands the one in the lands will be faster. Since some one was on the subject of cars, look at it this way, 2 cars both identical except one is a powerglide (automatic) with a trans break and a 2 step, the other is a straight gear, when there staged up beside each other the auto car is sitting there at 5k rpm holding pressure against the drivetrain with the transbrake, the straight is sitting there free revving at 5k with all the slack in the drivetrain, when the light turns green who do you think will be faster and more consistent? I can get 3070 from a 300wby/210berger/imr4350 and my match chamber has .060" freebore, hell I bet I could add a 10grn higher charge of retumbo and break 3200 but I doubt the accuracy would be the same.</p></blockquote><p></p>
[QUOTE="backwoods83, post: 503157, member: 29890"] Ok I'll correct you, depending on the manufacturer a typical 300wm has .060-.100" freebore. And most of the post are bs, gary has it rigth the .361" freebore in weatherby mags is to prevent an enormous pressure spike when using factory weatherby ammo loaded upwards of 75k psi. When ole man weatherby started these (drag car) rifles surplus Imr 4350 was about the slowest powder available so they were loaded hot as hell and given extra freebore to prevent injury. Its fact that if you use the same bullet, case, primer, and powder charge, seat 1 .005" in the lands and another .005 off the lands the one in the lands will be faster. Since some one was on the subject of cars, look at it this way, 2 cars both identical except one is a powerglide (automatic) with a trans break and a 2 step, the other is a straight gear, when there staged up beside each other the auto car is sitting there at 5k rpm holding pressure against the drivetrain with the transbrake, the straight is sitting there free revving at 5k with all the slack in the drivetrain, when the light turns green who do you think will be faster and more consistent? I can get 3070 from a 300wby/210berger/imr4350 and my match chamber has .060" freebore, hell I bet I could add a 10grn higher charge of retumbo and break 3200 but I doubt the accuracy would be the same. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Freebore in a hunting rifle.
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