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Rifles, Reloading, Optics, Equipment
Reloading
Variations in seating depth
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<blockquote data-quote="vancewalker007" data-source="post: 1965427" data-attributes="member: 66917"><p>Lots of things can cause this. The biggest is variations in case neck tension which happens more to cases you are reusing after firing. This is caused by the necks becoming work hardened and is fixed by annealing. I anneal every 2 shots, some people anneal every shot. </p><p></p><p>Another thing that causes it is variation in bullet ogive. They can vary and those bullets you are using vary. The most consistent bullets I've used are any mono bullets like Barnes and Bergers. Bergers are very consistent. </p><p></p><p>Another very common issue can be caused by you. The speed you run your press ram needs to be the same everytime. I try to use a slow smooth stroke, now you're laughing. A tip related to this is going past your number by to heavy of a stroke. As you set up you die slowly sneaking in the last few thousand we tend to use very slow press movements. Then the first full seating of the next bullet we use a normal speed and whoops, past the mark. Just be aware of this. If you get one too short it's easy to fix. Put it in your bullet puller hammer and give it a gentle tap, viola, it's longer.</p><p></p><p>I just loaded 20 7mm LRM rounds so this was fresh in my mind. I was using new cases so no issues with neck hardness. I was wanting 2.706 ogive measurement. I snuck up to 2.706 on the first one, the second one was 2.7075 because I was being careful not do the going past issue. So, I ran it a little firmer a second time and pushed it to 2.7065. then I eased the die down just a hair and the rest turned out 2.706-2.707 except the last one which had a looser neck (I could feel it as I seated it). I had to use the puller tap method so it went from 2.7045 to 2.706, perfect.</p><p></p><p>The point of me telling you this is +/- .0015 is the rule of thumb I use. Learned it from my father who has been loading for about 50 years.</p></blockquote><p></p>
[QUOTE="vancewalker007, post: 1965427, member: 66917"] Lots of things can cause this. The biggest is variations in case neck tension which happens more to cases you are reusing after firing. This is caused by the necks becoming work hardened and is fixed by annealing. I anneal every 2 shots, some people anneal every shot. Another thing that causes it is variation in bullet ogive. They can vary and those bullets you are using vary. The most consistent bullets I've used are any mono bullets like Barnes and Bergers. Bergers are very consistent. Another very common issue can be caused by you. The speed you run your press ram needs to be the same everytime. I try to use a slow smooth stroke, now you're laughing. A tip related to this is going past your number by to heavy of a stroke. As you set up you die slowly sneaking in the last few thousand we tend to use very slow press movements. Then the first full seating of the next bullet we use a normal speed and whoops, past the mark. Just be aware of this. If you get one too short it's easy to fix. Put it in your bullet puller hammer and give it a gentle tap, viola, it's longer. I just loaded 20 7mm LRM rounds so this was fresh in my mind. I was using new cases so no issues with neck hardness. I was wanting 2.706 ogive measurement. I snuck up to 2.706 on the first one, the second one was 2.7075 because I was being careful not do the going past issue. So, I ran it a little firmer a second time and pushed it to 2.7065. then I eased the die down just a hair and the rest turned out 2.706-2.707 except the last one which had a looser neck (I could feel it as I seated it). I had to use the puller tap method so it went from 2.7045 to 2.706, perfect. The point of me telling you this is +/- .0015 is the rule of thumb I use. Learned it from my father who has been loading for about 50 years. [/QUOTE]
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Reloading
Variations in seating depth
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