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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Fireform to .375 WBY?
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<blockquote data-quote="Kennibear" data-source="post: 900935" data-attributes="member: 51650"><p>MagnumManiac</p><p></p><p>From your last post it is clear you understand the "overbore" concept which is difficult to explain to newcomers. Just between you and me I have never been impressed with Remington's ammo offerings. I have never clocked any that was close to velocity as advertised.</p><p></p><p>I am curious why you went to RL17 for powder as its burn rate is faster than you need for the Weatherby? Most of the contributors to this site using 375 RUM's start with slower burn rates- more in the Retumbo/H1000 speed range. With 1/2" freebore the Weatherby 375 and RUM are pretty close in case capacity. As you know, that 1/2" is case capacity not surrounded by brass. With that much boiler room don't you feel the RL17 is too fast? The 375 Ruger is between the H&H and your Weatherby in capacity and it develops max pressure with powders of that speed with less than 100% loading density. I am about to try Superformance/RL19/RamShot Hunter speed powders (pending availability) because of it. RealGuns used RL19 w/ the 300gr Sierra in Joe's 375 Ruger data and it worked well. I have some of that load awaiting range testing.</p><p></p><p>Like you I seat to max mag length as long as the bullet does not jam the rifling. Some loads are seated deep enough to use the crimp groove as the recoil is heavy enough to back out the bullet if the neck tension is not sufficient. Roy Weatherby avoided a lot of problems by adding free-bore. To the nay sayers who think it harms accuracy I can tell you of several that shoot as well as I can hold.</p><p></p><p>If you don't mind could you post some of the data for your tests of the factory ammo? What are they doing with 300gr? It sure would help to know what can reasonably be expected. Thanks for your input!</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 900935, member: 51650"] MagnumManiac From your last post it is clear you understand the "overbore" concept which is difficult to explain to newcomers. Just between you and me I have never been impressed with Remington's ammo offerings. I have never clocked any that was close to velocity as advertised. I am curious why you went to RL17 for powder as its burn rate is faster than you need for the Weatherby? Most of the contributors to this site using 375 RUM's start with slower burn rates- more in the Retumbo/H1000 speed range. With 1/2" freebore the Weatherby 375 and RUM are pretty close in case capacity. As you know, that 1/2" is case capacity not surrounded by brass. With that much boiler room don't you feel the RL17 is too fast? The 375 Ruger is between the H&H and your Weatherby in capacity and it develops max pressure with powders of that speed with less than 100% loading density. I am about to try Superformance/RL19/RamShot Hunter speed powders (pending availability) because of it. RealGuns used RL19 w/ the 300gr Sierra in Joe's 375 Ruger data and it worked well. I have some of that load awaiting range testing. Like you I seat to max mag length as long as the bullet does not jam the rifling. Some loads are seated deep enough to use the crimp groove as the recoil is heavy enough to back out the bullet if the neck tension is not sufficient. Roy Weatherby avoided a lot of problems by adding free-bore. To the nay sayers who think it harms accuracy I can tell you of several that shoot as well as I can hold. If you don't mind could you post some of the data for your tests of the factory ammo? What are they doing with 300gr? It sure would help to know what can reasonably be expected. Thanks for your input! KB [/QUOTE]
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.375 H&H Fireform to .375 WBY?
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