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Rifles, Reloading, Optics, Equipment
Reloading
Trimming case length, how much does it really matter?
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<blockquote data-quote="MagnumManiac" data-source="post: 976584" data-attributes="member: 10755"><p>Unless you have a highly tuned rifle with tight tolerances, you will see no difference in group size, and even then it depends on more than a few factors.</p><p>When fireforming for improved cases, the neck always shrinks in length as the case shoulder pulls brass out of the neck as it expands. A few loads later, the neck has grown and a trim may be in order, not once have I seen a difference in group size from this in a hunting rifle, but in my 22-250AI there is a very slight but noticeable difference, but I feel this is due to neck tension differences rather than any other reason. The neck expands from the shoulder forward upon firing, so the length should not influence the accuracy directly other than having less neck tension.</p><p></p><p>Mikecr,</p><p>I don't see how a shorter neck creates more clearance for gas to find a way past the neck, with the correct pressure range the amount of gas bypassing the neck should actually be less, not more. Only on a few occasions have I seen gas marks that have gone more than 1/10" down a neck, and this has always been only on one side, this fact I have no answer for, but is my observation in quite a few cartridges. One odd observation I have is that true big bores are crazy accurate with no tuning, truing or blueprinting necessary, again, I have no answer for this fact either.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 976584, member: 10755"] Unless you have a highly tuned rifle with tight tolerances, you will see no difference in group size, and even then it depends on more than a few factors. When fireforming for improved cases, the neck always shrinks in length as the case shoulder pulls brass out of the neck as it expands. A few loads later, the neck has grown and a trim may be in order, not once have I seen a difference in group size from this in a hunting rifle, but in my 22-250AI there is a very slight but noticeable difference, but I feel this is due to neck tension differences rather than any other reason. The neck expands from the shoulder forward upon firing, so the length should not influence the accuracy directly other than having less neck tension. Mikecr, I don't see how a shorter neck creates more clearance for gas to find a way past the neck, with the correct pressure range the amount of gas bypassing the neck should actually be less, not more. Only on a few occasions have I seen gas marks that have gone more than 1/10" down a neck, and this has always been only on one side, this fact I have no answer for, but is my observation in quite a few cartridges. One odd observation I have is that true big bores are crazy accurate with no tuning, truing or blueprinting necessary, again, I have no answer for this fact either. Cheers. gun) [/QUOTE]
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Reloading
Trimming case length, how much does it really matter?
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