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Long Range Hunting & Shooting
Case trimmer- what to buy and not to buy
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<blockquote data-quote="entoptics" data-source="post: 1650551" data-attributes="member: 104268"><p>I would add another comment about the Frankford, and any other trimmer that indexes on the shoulder...</p><p></p><p>Unless you're running a belted mag (and doing it wrong), IMO, indexing on the shoulder is the datum that is important to trimming. You can get ±0.0005 precision in OAL length with a good trimmer, but frankly, does that matter? If you've trimmed with the primer in, or there's an ejector mark on the case head, you are measuring OAL and not neck length.</p><p></p><p>With the shoulder indexing trimmers (Frankford), you are trimming the neck relative to the shoulder. You can trim before you bump the shoulders or after. Doesn't matter what OAL is. The distance of the neck from the shoulder datum will be the same, which IMO, is the important variable. Where the neck ends relative to the rifling when the cartridge is seated before BOOM.</p><p></p><p>A couple of times early on, I saw huge variation in OAL with the Frankford. Got frustrated, and was about to take it out back for the "Old Yeller" treatment, when I realized I had a smidge of primer cratering. Popped the primers out, remeasured, and suddenly all was well.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1650551, member: 104268"] I would add another comment about the Frankford, and any other trimmer that indexes on the shoulder... Unless you're running a belted mag (and doing it wrong), IMO, indexing on the shoulder is the datum that is important to trimming. You can get ±0.0005 precision in OAL length with a good trimmer, but frankly, does that matter? If you've trimmed with the primer in, or there's an ejector mark on the case head, you are measuring OAL and not neck length. With the shoulder indexing trimmers (Frankford), you are trimming the neck relative to the shoulder. You can trim before you bump the shoulders or after. Doesn't matter what OAL is. The distance of the neck from the shoulder datum will be the same, which IMO, is the important variable. Where the neck ends relative to the rifling when the cartridge is seated before BOOM. A couple of times early on, I saw huge variation in OAL with the Frankford. Got frustrated, and was about to take it out back for the "Old Yeller" treatment, when I realized I had a smidge of primer cratering. Popped the primers out, remeasured, and suddenly all was well. [/QUOTE]
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Case trimmer- what to buy and not to buy
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