Weatherby cartridge O.A.L.

Discussion in 'The Ammo & Reloading Forum' started by reynolds357, Nov 23, 2011.

  1. reynolds357

    reynolds357 Former Guest

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    Does anyone have a simple method of determining the proper seat depth of bullets in ammuntion loaded in Weatherby calibers for Weatherby rifles? The way I do it will not work for certain shorter bullets.
  2. steve4102

    steve4102 Former Guest

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    Roy Weatherby built his rifles and reputation around speed and power. One of the things he did to accomplish this (safely) was to design his cartridges with extremely long throats. That said, finding the Max OAL where a particular bullet contacts the lands and still remains in the case may be a tall order.

    Finding the proper OAL is kinda like finding the best powder/bullet combo, it's all about trial and error. Me, I would start with the bullet seated to Mag length (make sure you are not jammed into the lands) and start testing loads and decreasing OAL in .010-.015 increments.
    Last edited: Nov 24, 2011
  3. JLA

    JLA Well-Known Member

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    Spot on steve. I aint ever loaded for a weatherby that would take a rounds seated to the lands. They all have long leade from the factory, only way aroun dit is to rebarrel and go with a shorter leade. I found most seem to shoot best around .200" jump..:eek:
  4. reynolds357

    reynolds357 Former Guest

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    Thanks for the info.
    Here is a freebore chart of WBY chambers:
    Cartridge Throat length (free bore)
    .224 Weatherby Magnum .162
    .240 Weatherby Magnum .169
    .257 Weatherby Magnum .378
    .270 Weatherby Magnum .378
    7MM Weatherby Magnum .378
    .300 Weatherby Magnum .361
    .340 Weatherby Magnum .373
    .375 Weatherby Magnum .373
    .378 Weatherby Magnum .756
    .416 Weatherby Magnum .239
    .460 Weatherby Magnum .756
    .30-378 Weatherby Magnum .361
    .338-378 Weatherby Magnum .361

    I just bought a .257, and the problem I am running into is that with .378 freebore, many light weight boat tail bullets cant be seated out far enough to contact the rifling. When I can contact the rifling, I contact it and back up the listed amount of freebore. When I can't it kind of gets into a guessing mess. What seems to work best is setting up the seating die on a most similiar WBY factory loaded cartridge, but there has to be a better way than that.
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