im just curious if im doing more hard than good. my goal is a 2.872 oal. i have a micrometer die so i seat every bullet to 2.876ish and walk it in. this gets me .000 runout as i measure the oal between reseats but im wondering since the seating die indexes on the ogive am i screwing up my jump to the lands?
bullet seating depth
- Thread starter 42769vette
- Start date
Re: bullet seating depth
Im confused as to what your asking here.
You want 2.872 oal but seat to 2.876, and walk the rest in? What does that mean?
When you refer to runout are you talking about concentricity or something else? Im not sure how seating depth in this circumstance will have an effect on concentricity.
I consider runout to be something that is largely due to seating technique, quality of the dies and physical aspects of the neck.
Sorry just dont understand what it is that your asking.
Im confused as to what your asking here.
You want 2.872 oal but seat to 2.876, and walk the rest in? What does that mean?
When you refer to runout are you talking about concentricity or something else? Im not sure how seating depth in this circumstance will have an effect on concentricity.
I consider runout to be something that is largely due to seating technique, quality of the dies and physical aspects of the neck.
Sorry just dont understand what it is that your asking.
Re: bullet seating depth
You really need to measure the length from the cartridge base to the ogive, rather than the OAL. To do this properly refer to the Hornady Lock-n-load equipment in this link http://www.midwayusa.com/browse/Bro...ryId=9506&categoryString=9315***731***8868*** After getting this length, you can then adjust your seating dies to seat your bullets at the depth you desire in relation to the lenth to the bullet engaging the rifling.
The reason for this is that the noses of most bullets vary. Also, the method of either smoking a bullet or using magic marker to get a length to engaging the rifling does not work as the ejector pushes the cartridge away from the bolt face.
I shoot a lot of long range F-Class matches and have found that Sierra MatchKings usually like about .020" jump to the rifling or a slight (.010") jam into the rifling. BUT REMEMBER, WHEN YOU JAM A BULLET AND THEN OPEN THE BOLT, THE BULLET WILL STAY IN THE BARREL.
Also, as a barrel gets shot, the distance to the rifling will change as it wears. Also, different lots of bullets may vary in what is needed to seat them at the desired distance to the rifling.
Good shooting,
George
You really need to measure the length from the cartridge base to the ogive, rather than the OAL. To do this properly refer to the Hornady Lock-n-load equipment in this link http://www.midwayusa.com/browse/Bro...ryId=9506&categoryString=9315***731***8868*** After getting this length, you can then adjust your seating dies to seat your bullets at the depth you desire in relation to the lenth to the bullet engaging the rifling.
The reason for this is that the noses of most bullets vary. Also, the method of either smoking a bullet or using magic marker to get a length to engaging the rifling does not work as the ejector pushes the cartridge away from the bolt face.
I shoot a lot of long range F-Class matches and have found that Sierra MatchKings usually like about .020" jump to the rifling or a slight (.010") jam into the rifling. BUT REMEMBER, WHEN YOU JAM A BULLET AND THEN OPEN THE BOLT, THE BULLET WILL STAY IN THE BARREL.
Also, as a barrel gets shot, the distance to the rifling will change as it wears. Also, different lots of bullets may vary in what is needed to seat them at the desired distance to the rifling.
Good shooting,
George
Re: bullet seating depth
He is saying that he thinks he may be damaging or setting back his ogive by reseating several times. Thus, he thinks he may be screwing up his measurements since the bullet/case will actually have different value than the measured (OAL or ogive) if the bullet is scarred/dented where the seating die contacts by too much seating. At least that's how I read it.
He is saying that he thinks he may be damaging or setting back his ogive by reseating several times. Thus, he thinks he may be screwing up his measurements since the bullet/case will actually have different value than the measured (OAL or ogive) if the bullet is scarred/dented where the seating die contacts by too much seating. At least that's how I read it.
Re: bullet seating depth
ok mabye i should have worded this better.
if im going for a oal of 2.872 i set my seater to 2.876ish. i have a forester micrometer die. i shorten the oal and reseat until i get the 2.872.
my question is since the die seats off the ogive (i think) am i really screwing myself by doing this. i really dont care how long reloading takes me i just want the closest thing to perfection i can get. if it takes me 10 minutes per round im ok with that.
i thought runout was the diffrences in oal from a specific number of cartriges. apparently im mistaken
ok mabye i should have worded this better.
if im going for a oal of 2.872 i set my seater to 2.876ish. i have a forester micrometer die. i shorten the oal and reseat until i get the 2.872.
my question is since the die seats off the ogive (i think) am i really screwing myself by doing this. i really dont care how long reloading takes me i just want the closest thing to perfection i can get. if it takes me 10 minutes per round im ok with that.
i thought runout was the diffrences in oal from a specific number of cartriges. apparently im mistaken
Re: bullet seating depth
Runout is the value that the bullet if off center with the case and thus the bore. You measure this with a roll caliper on the bullet while rolling the case concentrically in a jig. Hornady makes a fine tool for checking and adjusting runout.
Runout is the value that the bullet if off center with the case and thus the bore. You measure this with a roll caliper on the bullet while rolling the case concentrically in a jig. Hornady makes a fine tool for checking and adjusting runout.
Re: bullet seating depth
vette, set your dies to have them seat exactly where you want them, and just seat them once.
Seating them out further, and then seating a little more at a time does nothing for you but waste your time.
In regards to runout or concentricity, we refer to how concentric the bullet and/or case is. If a bullet is seated with runout, it hits the lands at an angle and the bullet then travels down the barrel off its axis.
Keep in mind, runout can sometimes be difficult to see just by looking at your loaded rounds.
If your afraid of differences in OAL i suggest you meplat trim all of your projectiles.
Provided you use good dies (which you are), the base to ogive length should remain the same or very very close to for all of your loaded rounds.
If you fiddle around with your dies on each seat, all you are doing is creating inconsistancy.
vette, set your dies to have them seat exactly where you want them, and just seat them once.
Seating them out further, and then seating a little more at a time does nothing for you but waste your time.
In regards to runout or concentricity, we refer to how concentric the bullet and/or case is. If a bullet is seated with runout, it hits the lands at an angle and the bullet then travels down the barrel off its axis.
Keep in mind, runout can sometimes be difficult to see just by looking at your loaded rounds.
If your afraid of differences in OAL i suggest you meplat trim all of your projectiles.
Provided you use good dies (which you are), the base to ogive length should remain the same or very very close to for all of your loaded rounds.
If you fiddle around with your dies on each seat, all you are doing is creating inconsistancy.
Re: bullet seating depth
I think, you have read that people seat slightly, and then turn the case and then turn some more and then seat more and then turn more etc etc in order to reduce runout?
If thats the case, this refers to a technique that "may" reduce runout/concentricity.
Please remember, this has nothing to do with OAL but rather getting that projectile seated as straight as possible into that case... and the results may be questionable.
Runout/concentricity and OAL are two entirely different things
I think, you have read that people seat slightly, and then turn the case and then turn some more and then seat more and then turn more etc etc in order to reduce runout?
If thats the case, this refers to a technique that "may" reduce runout/concentricity.
Please remember, this has nothing to do with OAL but rather getting that projectile seated as straight as possible into that case... and the results may be questionable.
Runout/concentricity and OAL are two entirely different things
Re: bullet seating depth
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: vman</div><div class="ubbcode-body">
If you fiddle around with your dies on each seat, all you are doing is creating inconsistancy. </div></div>
this is what i was looking for, thanks vman
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: vman</div><div class="ubbcode-body">
If you fiddle around with your dies on each seat, all you are doing is creating inconsistancy. </div></div>
this is what i was looking for, thanks vman
Similar threads
