257 weatherby mag vanguard OAL problems

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larry fraser

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Just bought a 257 weatherby mag vanguard Deluxe.Just wondering if anybody has any load data or any suggestions on oal
 
I owned a 257wby myself.As for OAL ,I used 3.250" with 100gr partitions.My powder charge was 69gr of h-4831,with a fed 215 primer.Velocity was right around 3500fps with a 26" barrel,but you can expect 80fps to 100fps less with your 24" barrel.
 
does the vanguard and mark v have simular throat length, when i try and set close to the lands 110 grain accubond is barly seated
 
larry fraser said:
does the vanguard and mark v have simular throat length, when i try and set close to the lands 110 grain accubond is barly seated
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I would expect that the throats are the same in both rifles...should be 3/8" of freebore.

Just seat the bullets so you have enough in the neck to hold it...I'd go one caliber minimum and see how it shoots.

If the Accubond is a boat-tail I would go .250" of bullet ahead of the boat-tail
 
according to this article the 257 Wtby doesn't suffer much, or at all in a 24" tube....
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That is not what the article states.

"In theory, a 26-inch barrel will produce higher velocities than a 24-inch barrel when both are chambered for the same cartridge. In practice, this is not always true. There are times when actual chamber and bore dimensions of two barrels of the same caliber can vary enough to cause the shorter barrel to deliver velocities just as high and sometimes even higher than the longer barrel. Such was the case with the two Weatherby rifles in .257 Magnum I worked with for this report."

What it does say is that in this one particular case,the chamber and barrel dimensions varied enough to result in the shorter barreled rifle developing more pressure,and therefore more velocity with some loads.Nowhere does it state that it is normal for this cartridge to develop similar velocity in 24" and 26" barrels.If the chamber dimensions were the same,the 26" barrel would normally develop 80fps to 100fps more than the 24" barrel.Even with the difference in chambers,if you were to develop handloads for both rifles developing the same chamber pressure,the 26" barrel would show a velocity advantage.
 
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stubblejumper said:
That is not what the article states.

"In theory, a 26-inch barrel will produce higher velocities than a 24-inch barrel when both are chambered for the same cartridge. In practice, this is not always true. There are times when actual chamber and bore dimensions of two barrels of the same caliber can vary enough to cause the shorter barrel to deliver velocities just as high and sometimes even higher than the longer barrel. Such was the case with the two Weatherby rifles in .257 Magnum I worked with for this report."

What it does say is that in this one particular case,the chamber and barrel dimensions varied enough to result in the shorter barreled rifle developing more pressure,and therefore more velocity with some loads.Nowhere does it state that it is normal for this cartridge to develop similar velocity in 24" and 26" barrels.If the chamber dimensions were the same,the 26" barrel would normally develop 80fps to 100fps more than the 24" barrel.Even with the difference in chambers,if you were to develop handloads for both rifles developing the same chamber pressure,the 26" barrel would show a velocity advantage.
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Every rifle is different. If one were to pick another 257 Vanguard and another Mark V off the rack, the numbers could well be quite different. In theory, all other things being equal the 26" tube should be faster. But it wouldn't be enough to realize a difference in the field to most shooters, myself included. If I ever get around to building my 257 Weatherby it will wear a 25" tube to keep from getting drawn into these comparisons:D
 
And If I ever get the urge to have another .257" myself,it will be the 270wsm case necked down to .257" .It should be able to come very close to 257wby performance with a 26" barrel.However I might choose a vanguard action to build it on.
 
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