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The Range
Ammo & Reloading
Updated with 2nd round results - Began new load development today for the 6.5CM
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<blockquote data-quote="diggler1833" data-source="post: 3655873" data-attributes="member: 48072"><p>I'm a seating depth first guy, and it has always worked out for me...but there is no harm in doing it the other way. </p><p></p><p>The charge weight fist guys often look for velocity flat spots, and the seating depth guys look for accuracy nodes across depth windows (barrel erosion...why bother chasing the lands?).</p><p></p><p>Anyway, unless you're interested in benchrest or F-class shooting, I typically make gross depth changes of .015-.040 depending on how long my throat is.</p><p></p><p>A good example of why I play with seating depth first is with my latest "salvage" Savage 110 Timberline. The throat is extremely short, and I'm into the lands immediately.</p><p></p><p>Here are the first two quick groups with 129gr Hornady Interlocks just to get things going. Bear in mind that this bullet has a secant ogive and is a bit more depth sensitive (ignore the CBS on the middle, the groups are top and bottom).</p><p></p><p>[ATTACH=full]228602[/ATTACH]</p><p></p><p>Since three shot groups are not as reliable, I tried the same test again, before loading powder charges in 4-shot groups and going from there. Second target from left is the 2.665 COL, just to make sure it was wild...and it was. The next groups were all at 2.680. For reference, 2.690 puts me into the lands, so I'm only jumping. 010 here.</p><p></p><p>[ATTACH=full]228603[/ATTACH]</p><p></p><p>I'll probably experiment with higher charges of this combo, but my hunting bullet for this gun so far is the 120gr Nosler BT, which has thrown several groups in the .4s during development., and produced a 1.5" group at 300 yards.</p><p></p><p>Seating depth matters as much or more than charge weight.</p></blockquote><p></p>
[QUOTE="diggler1833, post: 3655873, member: 48072"] I'm a seating depth first guy, and it has always worked out for me...but there is no harm in doing it the other way. The charge weight fist guys often look for velocity flat spots, and the seating depth guys look for accuracy nodes across depth windows (barrel erosion...why bother chasing the lands?). Anyway, unless you're interested in benchrest or F-class shooting, I typically make gross depth changes of .015-.040 depending on how long my throat is. A good example of why I play with seating depth first is with my latest "salvage" Savage 110 Timberline. The throat is extremely short, and I'm into the lands immediately. Here are the first two quick groups with 129gr Hornady Interlocks just to get things going. Bear in mind that this bullet has a secant ogive and is a bit more depth sensitive (ignore the CBS on the middle, the groups are top and bottom). [ATTACH type="full" alt="20210812_110506.jpg"]228602[/ATTACH] Since three shot groups are not as reliable, I tried the same test again, before loading powder charges in 4-shot groups and going from there. Second target from left is the 2.665 COL, just to make sure it was wild...and it was. The next groups were all at 2.680. For reference, 2.690 puts me into the lands, so I'm only jumping. 010 here. [ATTACH type="full" alt="20210816_200838.jpg"]228603[/ATTACH] I'll probably experiment with higher charges of this combo, but my hunting bullet for this gun so far is the 120gr Nosler BT, which has thrown several groups in the .4s during development., and produced a 1.5" group at 300 yards. Seating depth matters as much or more than charge weight. [/QUOTE]
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Updated with 2nd round results - Began new load development today for the 6.5CM
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