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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Re-Barreling a Factory .300 RUM
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<blockquote data-quote="J E Custom" data-source="post: 1333135" data-attributes="member: 2736"><p>I always recommend SAMMI chamber dimensions unless the person is an expert Reloader and understands the effects of some of these changes. SAMMI reamers determine freebore and aid in controlling pressure at high velocity. Seating a bullet against the lands, only increases pressure and is not necessary to get accuracy.</p><p></p><p>Freebore is necessary on the big magnums if you want the advertised velocity without excessive pressures. freebore aids in obtaining max velocity at maximum pressures. If you decrease the freebore and load to maximum pressure normally powder charge will decrease and velocity will fall off.</p><p></p><p>So I use the reamer to determine freebore and recommend loading to mag length minus 10 to 20 thousandths.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1333135, member: 2736"] I always recommend SAMMI chamber dimensions unless the person is an expert Reloader and understands the effects of some of these changes. SAMMI reamers determine freebore and aid in controlling pressure at high velocity. Seating a bullet against the lands, only increases pressure and is not necessary to get accuracy. Freebore is necessary on the big magnums if you want the advertised velocity without excessive pressures. freebore aids in obtaining max velocity at maximum pressures. If you decrease the freebore and load to maximum pressure normally powder charge will decrease and velocity will fall off. So I use the reamer to determine freebore and recommend loading to mag length minus 10 to 20 thousandths. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Re-Barreling a Factory .300 RUM
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