Take a lesson from me.

I have shims that Hornady sent me, but I also have spare o-rings. So, I think that is a great idea. The situation you described is exactly what happened. I will also note that even though I had an extra station, I had not installed my RCBS powder die. That would have caught the issue. Alot of lessons to learn here.
 

walterbunning

Administrator
I will also note that even though I had an extra station, I had not installed my RCBS powder die. That would have caught the issue. Alot of lessons to learn here.
When I initially got my LNL AP years ago, I had problems with the powder measure, since mitigated, and that’s why I started using a powder cop. I started with the Hornady die, but you have to visually check it with every throw.. just one more thing to watch. Subsequently I switched to the RCBS unit because it actually locks up the press with an over or under charge without having to watch it constantly.
It should be noted though, that the RCBS Lockout Die will not work with rifle cases, whereas the Hornady Powder Cop will. I don’t load rifle on the LNL so that’s not an issue with me.
 
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Just to close the books on the 100 9mm rounds I was worried about, I pulled all 100 with the RCBS collet die. The die was awesome. I did not find any powder charges out of spec. Better safe then sorry. I resized and reloaded those same rounds using the Hornady ap press with new o-ring and a shim installed on the powder measure station as well as a small star lock washer installed on the powder measure screw that Walter mentioned a few posts back. I am confident there will not be a repeat. But, if it happens, I also have the RCBS lock out powder die in the station right after the powder drop. I had found 2 no powder charges when I discovered the issue. Luckily my finished cartridge bin was almost empty at that point.
 
Just to close the books on the 100 9mm rounds I was worried about, I pulled all 100 with the RCBS collet die. The die was awesome. I did not find any powder charges out of spec. Better safe then sorry. I resized and reloaded those same rounds using the Hornady ap press with new o-ring and a shim installed on the powder measure station as well as a small star lock washer installed on the powder measure screw that Walter mentioned a few posts back. I am confident there will not be a repeat. But, if it happens, I also have the RCBS lock out powder die in the station right after the powder drop. I had found 2 no powder charges when I discovered the issue. Luckily my finished cartridge bin was almost empty at that point.
Imo, no charge is more dangerous then overcharge. If the primer manages to unseat the bullet and get it started in your rifling and you don’t catch it, then the next round loads and fires with an obstructed barrel, you have bigger issues then a blown cartridge wich might give you some burns and blow out your mag.
 
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