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Rifles, Reloading, Optics, Equipment
Reloading
Question on jump
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<blockquote data-quote="rscott5028" data-source="post: 545150" data-attributes="member: 24624"><p>For starters, we commonly like to get the bullet near the lands, but rifles may still shoot well with a good bit of jump. </p><p> </p><p>Nonetheless, it sounds like you have several issues. </p><p> </p><p>(1) The Hornady modified cases aren't consistent. You should compare the length from case head to shoulder datum line of the modified case to a once fired case using the proper Hornady headspace adapter for your caliper. ..or, similar tool. The modified case headspace measurement is often much shorter than SAMMI and/or you fired brass. So, you may want to factor that into your measurements. </p><p> </p><p>(2) If the 160 AB touching the lands isn't even sitting in the case neck, then something seems awry. ...excessive throat, freebore, and/or headspace</p><p> </p><p>(a) You should ask your smith what he was using for a reamer and/or if he intentionally extended the throat/freebore</p><p> </p><p>(b) You might try a longer bullet such as the 180g Berger provided your twist is fast enough. </p><p> </p><p>(c) Freebore isn't necessarily bad, but it will lower pressure and velocity and require more powder to get the velocity back up. </p><p> </p><p>(3) If after working up a load that's accurate, you determine it won't fit in the magazine...</p><p> </p><p>(a) use the rifle as a single shot</p><p> </p><p>(b) look into the Wyatt's or similar extended magazine well</p><p> </p><p>Hope some of this makes sense.</p><p>-- Richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 545150, member: 24624"] For starters, we commonly like to get the bullet near the lands, but rifles may still shoot well with a good bit of jump. Nonetheless, it sounds like you have several issues. (1) The Hornady modified cases aren't consistent. You should compare the length from case head to shoulder datum line of the modified case to a once fired case using the proper Hornady headspace adapter for your caliper. ..or, similar tool. The modified case headspace measurement is often much shorter than SAMMI and/or you fired brass. So, you may want to factor that into your measurements. (2) If the 160 AB touching the lands isn't even sitting in the case neck, then something seems awry. ...excessive throat, freebore, and/or headspace (a) You should ask your smith what he was using for a reamer and/or if he intentionally extended the throat/freebore (b) You might try a longer bullet such as the 180g Berger provided your twist is fast enough. (c) Freebore isn't necessarily bad, but it will lower pressure and velocity and require more powder to get the velocity back up. (3) If after working up a load that's accurate, you determine it won't fit in the magazine... (a) use the rifle as a single shot (b) look into the Wyatt's or similar extended magazine well Hope some of this makes sense. -- Richard [/QUOTE]
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Question on jump
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