OAL keeps changing

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FIREARMZ

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I have just started reloading and everything was going along pretty good. I noticed that the AOL I had set of 1.250 was changing as I was running the press, it would get down to 1.120. I am using the following equipment:
Dillon RL550B
Dillon Dies
45ACP caliber

I have checked the lock nuts and everything is tight that I can see. I have re-adjusted it several times and it happens every time.
 
Just a wild guess, the case expander is expanding the case too much and the bullet is "falling" too far into the case before you crimp.

Are you seating the bullet and crimping in one step with the same die?
 
Flex in the ram? Seating stem screw not tight? Two different boxes of bullets (of the same type) with ogives in different places? Just some random thoughts. :)
 
measure the length of ten of the bullets before you seat them and see how much variance you have. if you have .030 difference between a lot of ten measured bullets, then don't sweat it
 
Every time I load lead with lube I can get about 300 before it loads up and changes the AOL. Happens quicker if I do not have enough bell.
 
taliv - your logic doesn't compute. :)

As long as a bullet is proper for the caliber being loaded and is long enough to go inside the case, the length of the bullet has little effect on the OAL. The seating die will push the bullets in the case [usually] to the same length no matter how much difference there is in the bullets themselves.
 
I was going to post something on thie but you beat me to it. Your just going to have a difference in case pressure. a .030 longer bullet thats like a different bullet in grains.
 
bullet lenght does make a differance, I use seirra match kings in .308 and each bullet is a differant lenght, verified my seirra, so the oal is differant for every loaded carteridge. Its because the tip is sometimes drawn out. But the ogive is the same, which is the curved part of the bullet the seating die comes in contact with.
 
mal and scrat, i assumed he was shooting LSWC or something and because of flash and wax on the tips, i'm pretty sure you can occasionally get one that's quite a bit different than the others.

i'll mess around with it when i get home from dinner, but i'll bet 8 or 9 out of ten are quite similar.

edit: ok, so ten random ones ranged from .639 to .657, with almost all of them between .639 and .650. so yeah, one sample was only .018 not .030 (btw, these are 'factory' bullets, not something i molded)
 
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My 550 can vary depth when I load progressive vs single's. If I don't have a case in the decap/sizer station, and seat, the length will be diff if I do.

Now whenever setting any dies and seating, I have all stations filled with cases...even if I'm doing single rounds.
 
As long as a bullet is proper for the caliber being loaded and is long enough to go inside the case, the length of the bullet has little effect on the OAL. The seating die will push the bullets in the case [usually] to the same length no matter how much difference there is in the bullets themselves.

That depends on how you're measuring the OAL. If you measure from tip to toe using a caliper, the measurements may be all over the place for the reason stated by kennedy. If you're using a bullet comparator and your OAL measurements are wandering, then you've got a problem.

:)
 
Carp, your problem is the problem with all Dillon presses. The press is made to load a bunch of shells and when used for just 1 the floating die design shows its ugly head. There is a kit made, not by Dillon, to fix the die head in the press and keep it from wandering around side to side and up and down. Basically threaded inserts are put into the die holder and bolts are run down through the keeper pin holes through the die holder fixing it in place. It would add anohter 45 seconds to a die change over. Was thinking of getting one of the kits myself. An ad for the kit was in either Shotgun News or American Rifleman all the way to the back this past month.
 
This old rumor rears it's head every so often on these forums.

Carp, your problem is the problem with all Dillon presses. The press is made to load a bunch of shells and when used for just 1 the floating die design shows its ugly head. There is a kit made, not by Dillon, to fix the die head in the press and keep it from wandering around side to side and up and down. Basically threaded inserts are put into the die holder and bolts are run down through the keeper pin holes through the die holder fixing it in place. It would add anohter 45 seconds to a die change over. Was thinking of getting one of the kits myself. An ad for the kit was in either Shotgun News or American Rifleman all the way to the back this past month.

Yes the tool head can move up and down a tiny amount in it's slot. The point has always been, it's movement is always consistent. Side to side? come on now that's really stretching it! Proof in these pics;

P2080001_edited.jpg

Reading before the press ram is raised,IE in neutral/zero

P2080002_edited.jpg

Reading is .013, in case you can't read it. My point is it is .013 every time!

This was while loading 45 acp with 200 RFN lead boolits. Lee carbide dies, no lube used, factory crimp die in last station. The die in front of the dial indicator is the powder check die base.

That kit is a solution to a non-existent problem.

Another point; You will be drilling, tapping parts that cannot be returned to original, except buying a whole new press frame. Think long and hard about this, "so called problem"!

Added to that, if this is done by someone with a hand hole shooter,(drill motor), I'd bet those holes will not be in perfect alignment. Short of setting the bare press up in a milling vise, indicating everything level and square, you will not have those modifications straight.
 
I think the plug in your seating die doesn't match the bullet nose profile. It usually doesn't do it with jacketed bullets and shows up as a problem with certain cast bullets. How do they shoot? That's what really matters.
 
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