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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: 1333268" data-attributes="member: 2736"><p>Factory barrels have SAMMI chambers, so if your smith reams you Krieger barrel with a SAMMI reamer it will be the same depending on the quality of the factory chamber.</p><p></p><p>SAMMI is the official guidelines for Reamer manufactures, factory rifles and Ammo and should be adhered to. Factory chambers are designed to handle factory ammo with safety and to prevent someone from seating the ammo/loads to long causing pressure problems, They limit the ammo length by using the magazine. The real reason someone needs a cartridge longer than the magazine is to get more powder in the case by seating the bullet longer increasing the COAL. This requires single loading or modifying the magazine to except the longer COAL. </p><p></p><p>Seating the bullet against the lands should not be tried by a novice Reloader because of the many problems associated with this practice</p><p>and only an experienced Reloader should try this in my opinion.</p><p></p><p>Some of us have been shooting and reloading for many years and know what to expect and how to deal with changes in SAMMI chambers and ammo out of specifications. (I have been reloading 50 plus years and the experience has taught me never to recommend anything but a SAMMI chamber and ammo so people will stay out of trouble).</p><p></p><p>I have used many SAMMI reamers And all Of my wildcat designs Have the same amount or more freebore for the reasons I have mentioned. 5 of my personal rifles have/will shoot under 1/10th of an MOA (Less than ,100 thousandth 5 shot groups and all loads are Mag length Minus 10 to 20 thousandths. The largest being group under 1/10th MOA. is .092 and the smallest group is .034 thousandths all with standard freebore or more. So I don't feel that I have to shoot anything but SAMMI specification chambers and ammo to get accuracy.</p><p></p><p>Just My opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1333268, member: 2736"] Factory barrels have SAMMI chambers, so if your smith reams you Krieger barrel with a SAMMI reamer it will be the same depending on the quality of the factory chamber. SAMMI is the official guidelines for Reamer manufactures, factory rifles and Ammo and should be adhered to. Factory chambers are designed to handle factory ammo with safety and to prevent someone from seating the ammo/loads to long causing pressure problems, They limit the ammo length by using the magazine. The real reason someone needs a cartridge longer than the magazine is to get more powder in the case by seating the bullet longer increasing the COAL. This requires single loading or modifying the magazine to except the longer COAL. Seating the bullet against the lands should not be tried by a novice Reloader because of the many problems associated with this practice and only an experienced Reloader should try this in my opinion. Some of us have been shooting and reloading for many years and know what to expect and how to deal with changes in SAMMI chambers and ammo out of specifications. (I have been reloading 50 plus years and the experience has taught me never to recommend anything but a SAMMI chamber and ammo so people will stay out of trouble). I have used many SAMMI reamers And all Of my wildcat designs Have the same amount or more freebore for the reasons I have mentioned. 5 of my personal rifles have/will shoot under 1/10th of an MOA (Less than ,100 thousandth 5 shot groups and all loads are Mag length Minus 10 to 20 thousandths. The largest being group under 1/10th MOA. is .092 and the smallest group is .034 thousandths all with standard freebore or more. So I don't feel that I have to shoot anything but SAMMI specification chambers and ammo to get accuracy. Just My opinion J E CUSTOM [/QUOTE]
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Re-Barreling a Factory .300 RUM
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