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Old March 3rd, 2019, 03:04 PM #1
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Dillon 550 and coated bullets problems

I'm reloading 9mm using polymer, 147 gr bullets. I'm using a Wilson case gauge to check. I'm getting about a 20% fail rate after initial loading. After I run the failures through a separate Lee FCD, I'm at a 10% failure rate. What am I doing wrong?
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Old March 3rd, 2019, 04:30 PM #2
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Quote:
Originally Posted by jimbobborg View Post
I'm reloading 9mm using polymer, 147 gr bullets. I'm using a Wilson case gauge to check. I'm getting about a 20% fail rate after initial loading. After I run the failures through a separate Lee FCD, I'm at a 10% failure rate. What am I doing wrong?
Process of elimination, check some resized, unprimed, unloaded cases in the gauge. If the cases won't go into the gauge, then youíre resizing is the problem. If they are fine, you could be bulging the case with the bullet or your crimp isnít enough for the flare.

It's also important to have the bullet strait when you press it in place. If it's off, even slightly, the bulge can happen.

You should see the base of the 9mm bullet outline on the outside of the case. It should be uniform all the way around. If you only see one side, the die is likely off. Loosen the die lock rings, put cases in all 4 stations, and pull the handle down and tighten all die lock rings. This ensures the dies are straight in the toolhead so bullet seats strait.

Hope this helps,
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Old March 3rd, 2019, 05:32 PM #3
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The case gauge will tell you they are in spec, for sure. But, your rounds might still be fine to shoot. If you plan to shoot them through a specific gun, take the barrel out of that and use it to check the rounds. The chamber dimensions in a barrel will vary as the tools that cut them age. So, you may very well have no issue. If you don't know what the round should look like when you drop it in, go get yourself a factory load, hold the barrel chamber side up, and drop it in. Take note of what it looks like. Next, grab some of your loads and do the same thing. If they look like the factory rounds, you're at least safe headspace-wise. It's no guarantee you still may not have issues, e.g. with feed and such, but they should be safe to shoot as long as your load data, powder charge, and primers are good.

If they don't "plunk" your barrel correctly, then you do still have some work to do.
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Old March 3rd, 2019, 06:02 PM #4
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What size bullets are you shooting?
I'm using Blue Bullets sized at .355
BBI sizes at .356 so I can see where their 147gr seated deeply may cause a slight bulge in the case.
What's your OAL?
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Old March 3rd, 2019, 06:50 PM #5
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If theynare not dropping all the way in the barrel after loading you probably have brass shot from a glock or your OAL is to long what gun?
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Old March 3rd, 2019, 08:09 PM #6
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I'm using Badman Bullets https://www.badmanbullets.com/Online...Polymer+Coated. Sized .356. 1.15" OAL. I used a case gauge so the rounds would fit in all of my competition 9mms. If I crimp tighter on the Dillon, I'll get ammunition where the bullet will jam in the lands. My pistols I'm using are a CZ Shadow 2, RIA double stack 1911, and an STI DVC 3-Gun. If it fits in the gauge, it's fine for all three. If it's meh, it jams in the CZ and STI. If it's"I need a hammer" I just take it apart and start over. But it's really annoying loading up 500 rounds and and finding 50 need extra attention or dismemberment.
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Old March 3rd, 2019, 08:13 PM #7
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CZ with 147 i have to load them short to fit mine with 147 also i only run a EGW U-die in all my pistols and i get 99percent. I only crimp enought to temove the bell inuse the sharpie method to check.
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Old March 3rd, 2019, 08:22 PM #8
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Just to fill in the last blank, what kind of brass are you loading with?
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Old March 3rd, 2019, 08:27 PM #9
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Range pick up brass.
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Old March 3rd, 2019, 09:16 PM #10
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What dies are you using?

Make sure your sizing die is all the way down to the shell holder. Only a 1/4 turn or so backed off after touching.

Are you getting a sharp circular rim near the base of the case that is preventing the bullet from going into the case gauge or is the binding up near the seated bullet?

Are you flaring the case mouth with the powder die enough to make sure you aren’t shaving the coating off when the bullet is seated? You might see crescent shaped lead pieces or pieces of coating on the shell plate?

What do you mean the bullet will jam in the lands? Are you saying that the action is hard to close? If you are running a .356 bullet at that long of a OAL, It very well may come in contact with the rifling or max out the chamber. This shouldn’t be a killer unless the action doesn’t close. It might make it hard to eject rounds.
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