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Rifles, Reloading, Optics, Equipment
Reloading
300 rum load development
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<blockquote data-quote="Gcan" data-source="post: 1588159" data-attributes="member: 102867"><p>I thought I was clear. I bump my 224 cases to .002" off shoulder. Coincidentally I have about 1/2 the gas leakage around the cases versus New brass. No stuck cases. </p><p></p><p>When I hunted I absolutely FL sized everything but I disagree that FL will as a rule deliver better groups on average. Using OEM SAMMI DIES that is simply not the case. That doesn't mean there are not cases where FL sizing doesn't pruduce good results, where all the stars align and a particular chamber matches up with a particular die, powder, bullet, case and variables. And above lies the answer, variables. To say sizing is not among the variables cannot be true. I know a lot of bench folk and unless they are using custom dies they shoot fire formed, bumped and neck sized brass to minimize expansion. </p><p>But opinions vary. I can see how in F class or precision rifle where dirt and dust are part of the game and a jammed case is death, FL sizing is a must due to the sport. But to simply state that as a factual matter, because a bunch of folk who shoot in dirt, who must full length size, are aslo loading the most accurate ammo doesn't stand the logic test for the same reasons neck sizing only in an AR is a recipe for disaster. The math alone, the stacking of tolerances, the likelihood that a case OD that is .005" or more under the chamber wall OD, in a throat that might be .005" over the case neck OD, and under the angular pressure of the ejector will better align concentrically to the bore axis every time than one that is only .002" L and .002" OD to Chamber just doesn't compute. </p><p></p><p>What I said is there are no absolutes in this game, but clearly your experience says otherwise. </p><p></p><p>Evidence not opinion:</p><p>Also, because of the problems I had with the Valkyrie I bought 2 more barrels. Each was built on a Megalithic matched upper and lower. A jewel trigger, a Gold and Timney triggers. NSX and Leopold Glass. </p><p>I shot the Starline new brass and also Federal 90smk match ammo thru all. </p><p>I hope we can agree those loads were full lenght sized. </p><p></p><p>Strangely the barrel with the smallest chamber relationship to the nominal new brass size shot the same ammo better in every single instance. And that is true in order of chamber size. The larger the fired brass was from its nominal state, the worse it shot. The chamber that allowed the brass to grow the most (the $800 barrel) universally finished last each time. That is empirical data suggesting that FL sizing is NOT the most accurate in every circumstance.</p></blockquote><p></p>
[QUOTE="Gcan, post: 1588159, member: 102867"] I thought I was clear. I bump my 224 cases to .002” off shoulder. Coincidentally I have about 1/2 the gas leakage around the cases versus New brass. No stuck cases. When I hunted I absolutely FL sized everything but I disagree that FL will as a rule deliver better groups on average. Using OEM SAMMI DIES that is simply not the case. That doesn’t mean there are not cases where FL sizing doesn’t pruduce good results, where all the stars align and a particular chamber matches up with a particular die, powder, bullet, case and variables. And above lies the answer, variables. To say sizing is not among the variables cannot be true. I know a lot of bench folk and unless they are using custom dies they shoot fire formed, bumped and neck sized brass to minimize expansion. But opinions vary. I can see how in F class or precision rifle where dirt and dust are part of the game and a jammed case is death, FL sizing is a must due to the sport. But to simply state that as a factual matter, because a bunch of folk who shoot in dirt, who must full length size, are aslo loading the most accurate ammo doesn’t stand the logic test for the same reasons neck sizing only in an AR is a recipe for disaster. The math alone, the stacking of tolerances, the likelihood that a case OD that is .005” or more under the chamber wall OD, in a throat that might be .005” over the case neck OD, and under the angular pressure of the ejector will better align concentrically to the bore axis every time than one that is only .002” L and .002” OD to Chamber just doesn’t compute. What I said is there are no absolutes in this game, but clearly your experience says otherwise. Evidence not opinion: Also, because of the problems I had with the Valkyrie I bought 2 more barrels. Each was built on a Megalithic matched upper and lower. A jewel trigger, a Gold and Timney triggers. NSX and Leopold Glass. I shot the Starline new brass and also Federal 90smk match ammo thru all. I hope we can agree those loads were full lenght sized. Strangely the barrel with the smallest chamber relationship to the nominal new brass size shot the same ammo better in every single instance. And that is true in order of chamber size. The larger the fired brass was from its nominal state, the worse it shot. The chamber that allowed the brass to grow the most (the $800 barrel) universally finished last each time. That is empirical data suggesting that FL sizing is NOT the most accurate in every circumstance. [/QUOTE]
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