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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth question!
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<blockquote data-quote="4xforfun" data-source="post: 1017068" data-attributes="member: 9172"><p>While your general premiss is true..... seating the bullet deeper in the case reduces case volume and thus, increases PSI, it realy is a moot point here.</p><p></p><p>First off, you need to move the bullet a hell of a long way in to make any meaningfull difference in PSI. BUT....move the same bullet out the other way, say .020 .....from say at the lands to a twenty thou jam, and you could see a HUGE spike in PSI.</p><p></p><p>If you start your load development at 10 thou or so INTO the lands and work SHORTER (if needed) you will NEVER have to worry about a PSI spike. You may see a very small and gentle PSI increase once you move a full 100 thou, you will NEVER be in danger.</p><p></p><p>The ONLY problem I ever see or hear about with a jam is the occasional time where the bullet gets stuck in the lands. I rarely see that in HUNTING CHAMBERS..the brass in the necks are usually pretty thick and the neck tension is usually substantial. You need to have a hell of a jam to cause problems. Of course, there are guys (like me) who run competition spec chambers in thier hunting guns. I have to neck turn for lots of my guns and run very little neck tension, and , yes, I have stuck bullets. But I have never had a problem with stuck bullets in my more "factory" type chambers.</p><p></p><p>And, in my case, anyway, the fact is that EVERY gun that I have ever done load development for has shot best with a SLIGHT to hard jam. Most of the loads are VLD's or Hybrids, but not all. Amax, Vmax, Balistic tips, X bullets...ect are also in the mix.</p><p></p><p>To the OP.....start your load development with a slight jam (as long as you are not running very thin necks with little neck tension) and work up in powder charge till you hit max (with the jam). You may well have seen at least two "sweet spots". Once you find "the load", simply do a group comparo at longer ranges with your current jam and maybe a .010 and .030 jump and let your groups decide the load. NEVER try and load to a .000 jam..or "just kissing". General bullet run out mixed with loading run out will give you a plus or minus .002 in ojive length....that means a small jump MIXED in with a small jam. And that very small difference ....002 jam vs jump will be HUGE on target.</p><p></p><p>Just my .02</p><p>Tod</p></blockquote><p></p>
[QUOTE="4xforfun, post: 1017068, member: 9172"] While your general premiss is true..... seating the bullet deeper in the case reduces case volume and thus, increases PSI, it realy is a moot point here. First off, you need to move the bullet a hell of a long way in to make any meaningfull difference in PSI. BUT....move the same bullet out the other way, say .020 .....from say at the lands to a twenty thou jam, and you could see a HUGE spike in PSI. If you start your load development at 10 thou or so INTO the lands and work SHORTER (if needed) you will NEVER have to worry about a PSI spike. You may see a very small and gentle PSI increase once you move a full 100 thou, you will NEVER be in danger. The ONLY problem I ever see or hear about with a jam is the occasional time where the bullet gets stuck in the lands. I rarely see that in HUNTING CHAMBERS..the brass in the necks are usually pretty thick and the neck tension is usually substantial. You need to have a hell of a jam to cause problems. Of course, there are guys (like me) who run competition spec chambers in thier hunting guns. I have to neck turn for lots of my guns and run very little neck tension, and , yes, I have stuck bullets. But I have never had a problem with stuck bullets in my more "factory" type chambers. And, in my case, anyway, the fact is that EVERY gun that I have ever done load development for has shot best with a SLIGHT to hard jam. Most of the loads are VLD's or Hybrids, but not all. Amax, Vmax, Balistic tips, X bullets...ect are also in the mix. To the OP.....start your load development with a slight jam (as long as you are not running very thin necks with little neck tension) and work up in powder charge till you hit max (with the jam). You may well have seen at least two "sweet spots". Once you find "the load", simply do a group comparo at longer ranges with your current jam and maybe a .010 and .030 jump and let your groups decide the load. NEVER try and load to a .000 jam..or "just kissing". General bullet run out mixed with loading run out will give you a plus or minus .002 in ojive length....that means a small jump MIXED in with a small jam. And that very small difference ....002 jam vs jump will be HUGE on target. Just my .02 Tod [/QUOTE]
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Seating depth question!
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