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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
+p 300 weatherby mag
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<blockquote data-quote="J E Custom" data-source="post: 2021599" data-attributes="member: 2736"><p>I totally agree <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /> <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /> </p><p>Weatherby's have extra freebore in order to get more velocity, and if you lessen the freebore with a special reamer, you will not be able to fire factory Weatherby ammo in it, so if you make any changes in the amount of freebore, always add more freebore.</p><p></p><p>When I wildcat Weatherby's, I add more freebore for certain bullets to hold pressure to safe limits and increase velocity. If the smithing is done right, 1/2 MOA accuracy is common. To date my most accurate Weatherbys will shoot 1/4 MOA or better. With the best (I have been able to shoot) .092 5 shot group with a 30/378.</p><p></p><p>The question of +p loadings normally means loads that are faster than SAMMI max loads, but unless changes are made to the chamber specs. all that is normally all that is achieved is more pressure. But with proper dimensional changes to the chamber, more velocity can be achieved without increasing the pressure.</p><p></p><p>If I don't feel that I need or can increase velocity by 100 ft/sec + without excessive pressure or loss of accuracy, I decide not to change a perfectly good cartridge. There are many changes that need to be made to achieve more velocity without any disadvantages. So unless a person understands the effects of each change, Don't do it.</p><p></p><p>Just some advice from an old wildcatter.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 2021599, member: 2736"] I totally agree 👍 👍 Weatherby's have extra freebore in order to get more velocity, and if you lessen the freebore with a special reamer, you will not be able to fire factory Weatherby ammo in it, so if you make any changes in the amount of freebore, always add more freebore. When I wildcat Weatherby's, I add more freebore for certain bullets to hold pressure to safe limits and increase velocity. If the smithing is done right, 1/2 MOA accuracy is common. To date my most accurate Weatherbys will shoot 1/4 MOA or better. With the best (I have been able to shoot) .092 5 shot group with a 30/378. The question of +p loadings normally means loads that are faster than SAMMI max loads, but unless changes are made to the chamber specs. all that is normally all that is achieved is more pressure. But with proper dimensional changes to the chamber, more velocity can be achieved without increasing the pressure. If I don't feel that I need or can increase velocity by 100 ft/sec + without excessive pressure or loss of accuracy, I decide not to change a perfectly good cartridge. There are many changes that need to be made to achieve more velocity without any disadvantages. So unless a person understands the effects of each change, Don't do it. Just some advice from an old wildcatter. J E CUSTOM [/QUOTE]
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