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Rifles, Reloading, Optics, Equipment
Reloading
Bullet off lands?
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<blockquote data-quote="Howland" data-source="post: 1608104" data-attributes="member: 103509"><p>Every rifle/bullet combination likes a particular amount of jump. Some combinations are very forgiving, some very finicky. Some bullets have a reputation for being forgiving, some like to be jammed. Loading to mag length in my .338LM RPR gives me about 0.080" off the lands. I've got accuracy to low .6 MOA. Maybe I could tighten that up with less jump but that would mean single loading. I choose not to go there. If my game was competition off the bench, I'd suck it up and single load if it meant shrinking that.</p><p></p><p>The first step is to determine what seating depth touches the lands. Measuring cartridge base (head) to ogive (CBTO) will be more precise than OAL. The last lot of 285gr. ELD-M have 0.003" variation from ogive to tip. If you're loading VLD bullets, use a VLD seating stem.</p><p></p><p>Seating depth differences will have only small effects on pressure and velocity unless you're touching or jamming. A stout but safe load jumping can go over the limit jamming the lands. Finding the optimal seating depth will be more accurate than a one size fits all OAL. Sometimes it's a little, sometimes it's significant.</p></blockquote><p></p>
[QUOTE="Howland, post: 1608104, member: 103509"] Every rifle/bullet combination likes a particular amount of jump. Some combinations are very forgiving, some very finicky. Some bullets have a reputation for being forgiving, some like to be jammed. Loading to mag length in my .338LM RPR gives me about 0.080" off the lands. I've got accuracy to low .6 MOA. Maybe I could tighten that up with less jump but that would mean single loading. I choose not to go there. If my game was competition off the bench, I'd suck it up and single load if it meant shrinking that. The first step is to determine what seating depth touches the lands. Measuring cartridge base (head) to ogive (CBTO) will be more precise than OAL. The last lot of 285gr. ELD-M have 0.003" variation from ogive to tip. If you're loading VLD bullets, use a VLD seating stem. Seating depth differences will have only small effects on pressure and velocity unless you're touching or jamming. A stout but safe load jumping can go over the limit jamming the lands. Finding the optimal seating depth will be more accurate than a one size fits all OAL. Sometimes it's a little, sometimes it's significant. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet off lands?
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