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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rifle project. 300WBY in Mark V or Vanguard or 300RUM in ??
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<blockquote data-quote="Trickymissfit" data-source="post: 733518" data-attributes="member: 25383"><p>Just picked up a loading manual, and the hottest load they had with the .300 Ultra and a 220 grain bullet was 2970 fps (the 225 grain would do 3000fps), but also take close to a hundred grains of powder to get there. yet looking in the Hogdon manual it takes about 92 grains of H870 to do the samething in the Weatherby. But lets get back to barrel life and these two rounds. </p><p> </p><p>Look at the case capacitys of these two rounds and we know both are over bore. But one is grossly overbore! Now look at the neck lengths of these two rounds. Tht Ultra has a .306" neck length under ideal conditions. The Weatherby neck is close to .360" long when you add the radius into the neck length. One has a 30 degree shoulder angle with the turbulance point just inside the throat. The other as a shoulder angle that will compute out to around 45 degrees. The turbulance point is roughly in the middle of the neck. That alone will give the Weatherby a far longer barrel life than the Ultra. </p><p> </p><p>Overbore rounds are well know to loose accuracey, and also known to be harder on barrels. Longer necks are also well known to promote longer barrel life. Steeper shoulder angles tend to move the T.P. further back towards the shoulder if the neck is long enough. T.P.'s that are in the throat will always give short barrel life. Nature of the design. Mike Walker probably had little if anything todo with this design. P.O. Ackley did nice nice essays on this subject alone. </p><p> </p><p>Taking a look inside the Hornaday manual, and looking at 220 grain bullets (I know they are round nosed). One sees that the Ultra does 3000 fps, but the Weatherby is actually very similar. Then we drop down to the .308 Norma Mag. The first two rounds were checked out in 26" barrel lengths. The .308 Norma used a 24" barrel length, and they got 2800fps using 73 grains of powder. That's a way better round.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 733518, member: 25383"] Just picked up a loading manual, and the hottest load they had with the .300 Ultra and a 220 grain bullet was 2970 fps (the 225 grain would do 3000fps), but also take close to a hundred grains of powder to get there. yet looking in the Hogdon manual it takes about 92 grains of H870 to do the samething in the Weatherby. But lets get back to barrel life and these two rounds. Look at the case capacitys of these two rounds and we know both are over bore. But one is grossly overbore! Now look at the neck lengths of these two rounds. Tht Ultra has a .306" neck length under ideal conditions. The Weatherby neck is close to .360" long when you add the radius into the neck length. One has a 30 degree shoulder angle with the turbulance point just inside the throat. The other as a shoulder angle that will compute out to around 45 degrees. The turbulance point is roughly in the middle of the neck. That alone will give the Weatherby a far longer barrel life than the Ultra. Overbore rounds are well know to loose accuracey, and also known to be harder on barrels. Longer necks are also well known to promote longer barrel life. Steeper shoulder angles tend to move the T.P. further back towards the shoulder if the neck is long enough. T.P.'s that are in the throat will always give short barrel life. Nature of the design. Mike Walker probably had little if anything todo with this design. P.O. Ackley did nice nice essays on this subject alone. Taking a look inside the Hornaday manual, and looking at 220 grain bullets (I know they are round nosed). One sees that the Ultra does 3000 fps, but the Weatherby is actually very similar. Then we drop down to the .308 Norma Mag. The first two rounds were checked out in 26" barrel lengths. The .308 Norma used a 24" barrel length, and they got 2800fps using 73 grains of powder. That's a way better round. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rifle project. 300WBY in Mark V or Vanguard or 300RUM in ??
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