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Rifles, Reloading, Optics, Equipment
Reloading
Fireforming .280 AI from .280 Remington brass or .270 Win brass?
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<blockquote data-quote="J E Custom" data-source="post: 1531238" data-attributes="member: 2736"><p>I saw this Video and It is flawed. When you chamber the 280 Ackley or the 280 SAMMI AI It is true that you can use the same reamer. "BUT" If you use the different head space gauges you will end up with different chamber lengths. </p><p></p><p>If you understand the relationship of the two and use the chamber dimensions of both (According to SAMMI) the body neck junction on the 280 Rem is 2.1924 from the case head. The 280 SAMMI AI body to neck junction is 2.1742 Making the chambers after fire forming .0182 different. with the .004 to .006 compression of the Ackley recommendation this will reduce the difference of the two chambers</p><p>to .0142. </p><p></p><p>Obviously, If you use the SAMMI head space gauge for both chambers, It will be a SAMMI 280 AI chamber but you may not be able to chamber a standard 280 Rem cartridge because it will be at least .014 thousandths long.</p><p></p><p>If you chamber it using the 280 REM head space gauge as Ackley recommended and try to shoot a Nosler 280 AI formed case you will end up with .014 to .018 space in front of the body neck junction and possibly have case head separation.</p><p></p><p>The Body taper per inch is just over .008 thousandths per inch on both cartridges so they will appear to head space the same but the shoulder will be located .014 to .018 different between the two.</p><p>So when you fire a Nosler SAMMI AI loaded round in the longer 280 Ackley chamber the case stretch will be .014 to .018 plus your head space (Normally .001 to .0015).</p><p></p><p>So a person has to make up his mind if he wants a SAMMI chamber or a Ackley chamber. As I have said before there is a difference in the chamber lengths and he has to decide if he wants to use every brand of 280 rem brass With the Ackley, or use only the Nosler brass</p><p>in the SAMMI chamber. If you do decide to use the Nosler SAMMI AI chamber in order to use the standard 280 brass you should full size it and bump the shoulder back .014 thousandths before loading and firing it the first time to prevent case stretch.</p><p></p><p>This is a safety issue and for sure a component issue.</p><p></p><p>I have chambered several dozen of both chambers and made it clear to the owners of the difference and the risk if this rule is not followed, and have had none of the problems discussed.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1531238, member: 2736"] I saw this Video and It is flawed. When you chamber the 280 Ackley or the 280 SAMMI AI It is true that you can use the same reamer. "BUT" If you use the different head space gauges you will end up with different chamber lengths. If you understand the relationship of the two and use the chamber dimensions of both (According to SAMMI) the body neck junction on the 280 Rem is 2.1924 from the case head. The 280 SAMMI AI body to neck junction is 2.1742 Making the chambers after fire forming .0182 different. with the .004 to .006 compression of the Ackley recommendation this will reduce the difference of the two chambers to .0142. Obviously, If you use the SAMMI head space gauge for both chambers, It will be a SAMMI 280 AI chamber but you may not be able to chamber a standard 280 Rem cartridge because it will be at least .014 thousandths long. If you chamber it using the 280 REM head space gauge as Ackley recommended and try to shoot a Nosler 280 AI formed case you will end up with .014 to .018 space in front of the body neck junction and possibly have case head separation. The Body taper per inch is just over .008 thousandths per inch on both cartridges so they will appear to head space the same but the shoulder will be located .014 to .018 different between the two. So when you fire a Nosler SAMMI AI loaded round in the longer 280 Ackley chamber the case stretch will be .014 to .018 plus your head space (Normally .001 to .0015). So a person has to make up his mind if he wants a SAMMI chamber or a Ackley chamber. As I have said before there is a difference in the chamber lengths and he has to decide if he wants to use every brand of 280 rem brass With the Ackley, or use only the Nosler brass in the SAMMI chamber. If you do decide to use the Nosler SAMMI AI chamber in order to use the standard 280 brass you should full size it and bump the shoulder back .014 thousandths before loading and firing it the first time to prevent case stretch. This is a safety issue and for sure a component issue. I have chambered several dozen of both chambers and made it clear to the owners of the difference and the risk if this rule is not followed, and have had none of the problems discussed. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Fireforming .280 AI from .280 Remington brass or .270 Win brass?
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