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Posted: 11/30/2014 3:34:04 AM EDT
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When I run one round of 45 acp(200 GR LSWC) through I'm hitting near perfect 1.250 OAL (+/- .002). When I start running all five stations I'm hitting 1.260 every time. I adjusted the seating stem down and get the 1.250 back but when I run a solo round I'm hitting 1.240 or a little less. I checked variance in bullet lengths and they have been +/- .001 so that isn't it. I took the sizing de-capping die out and cleaned it after running 1k 200gr LSWC without a issue. Is it possible that when I reset it I turned it down to far and with a case in that station its not allowing the ram to completely top out? That's the only thing I can think I changed in the set up. Everything else its still running like it was prior to cleaning the die.
Thank Jerry |
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There will be a small difference between the seating depth of a single round and the depth when the shellplate is full. The subplate is attached to the shaft by two screws 180 degrees apart. The seating die is on one side of (the axis created by) those two screws and the sizing die is on the other side. If one of those is empty, there can be a slight difference in the height the other side can reach.
This is most likely the cause of your problem, although 0.01" is more than I personally have experienced (ie, a few thousandths). The solution(s) are (a) keep the sizing die full when a round is being seated, and (b) accept the variation. |
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Quoted:
There will be a small difference between the seating depth of a single round and the depth when the shellplate is full. The subplate is attached to the shaft by two screws 180 degrees apart. The seating die is on one side of (the axis created by) those two screws and the sizing die is on the other side. If one of those is empty, there can be a slight difference in the height the other side can reach. This is most likely the cause of your problem, although 0.01" is more than I personally have experienced (ie, a few thousandths). The solution(s) are (a) keep the sizing die full when a round is being seated, and (b) accept the variation. This! Adjust with stations full and things will be fine. |
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TwoBoxer nailed it.
Somewhere on arfcom, there's a great detailed thread on 'shimming' the LnL AP - I'd expect this to reduce any variance from shell plate loaded to single case, but this is normal for progressives, not just the LnL AP - Dillons, as well - always load up the plate for adjusting 'final' OAL. |
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I have shimmed mine and it still has a variance when the plate is full or when only the seating die has a piece of brass.
I have also determined that when loading range pickups (various mixed headstamps) some brass will have more resistance in the seating, belling, and crimping dies than others. I am nearly positive this generates some of the variance. Try running only one headstamp and set the die with all the stations loaded. |
| You need to remember there is variance in brass thickness, height and bullet diameter. They all may stack up in either direction. Unless, you use brass form the same lot, same manufacturer and trim to equal length you are always going to be little bit off. Not a big deal. |
| As far as I can tell shimming, while excellent to resolve many "stacked tolerance" issues, unfortunately won't affect this kind of seating variance. The problem would not likely exist had Hornady used 3 or 4 screws spaced around instead of 2 screws 180 degrees apart. But AFAIK the AP is not the only press "suffering" from this minor flaw. |
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Quoted:
TwoBoxer nailed it. Somewhere on arfcom, there's a great detailed thread on 'shimming' the LnL AP - I'd expect this to reduce any variance from shell plate loaded to single case, but this is normal for progressives, not just the LnL AP - Dillons, as well - always load up the plate for adjusting 'final' OAL. Tuning the AP |
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Quoted:
TwoBoxer nailed it. Somewhere on arfcom, there's a great detailed thread on 'shimming' the LnL AP - I'd expect this to reduce any variance from shell plate loaded to single case, but this is normal for progressives, not just the LnL AP - Dillons, as well - always load up the plate for adjusting 'final' OAL. Not all AP's need to be shimmed so keep this in mind. I could not fit even the thinnest of shims in mine. |
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