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Posted: 4/2/2016 8:34:04 PM EDT
| Fairly new to reloading for AR. Sizing cases in Dillon die on turret press. Reloaded ammo shoots fine, but can't pull unfired rounds from chamber with charging handle (several AR's). Suggestions? Trimming to 1.760, 55g FMJ. |
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There are several reasons. You need to do your process one step at a time test chambering as you go.
Don't prime or powder charge the case so you can safely do it at home. Here are some possible reasons. Not sizing enough. Crimping (roll crimp) too much. Overall length of loaded round tool long. (Bullet sticking in barrel) This is very unlikely. Can I ask why you are trimming to maximum allowed length? It shouldn't cause any problems but most trim to the "recommended" length of 1.75" Motor |
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It's not the trim length.
The case headspace is about 0.001 to 0.0015 inches too long. The cure is adding lube inside the case neck first. If that doesn't correct the problem, then the die body should be turned down 1/32nd of an inch to push the case shoulder back. When the inside of the case neck is not lubed and the case is sized with the expander button in the die, the button pulls the shoulder back out just a little, a thousandth or so, undoing part of the sizing. Common problem with an easy fix. |
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Cover a loaded round with a Sharpie and chamber and unchamber it. You should see where the tight spot is. Also trim to 1.750 inches.
And make sure you are not loading to more than 2.250 inches..2.260 is max. Also if you over crimp, you will bulge the neck and that could stick in the chamber. Good luck! |
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One turn of the 7/8-14 thread pitch of a standard die is 1/14 = 0.071 inches.
So 1/8th of a turn moves the die body 0.009 inches. If the die lock nut is tightened, then the die won't move with the clearance in the threads causing that dimension to vary. I use smaller increments partly because they are about as easy to estimate as an eighth of a turn. |
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I believe the reason you can't eject the loaded round easily is because you haven't resized the case enough.
Simply screw the sizing die 1/16 turn, around 1/4" when measured from the lock ring and try again. Using different brand shell holders vs. resizing dies can cause tolerance stacking. This is common. By lowering the die (turning it clockwise) just a little more should fix the problem. I use gages and aim for .004" shorter brass than the fired measurement. You need a minimum of -.003" for perfect functioning in a semi-auto. Hornady makes a one size fits most gage called the Lock-N-Load headspace gage. It's the best value on the market because it works across the board on most standard calibers. Screwing the die down more squeezes another couple .001" of set-back more than simply touching the shell holder. Good Luck. |
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Quoted:
Get a case gauge and size the brass within the tolerances of the gauge. Easy peasy. Even a cheap lyman gauge is better than none. Been using one for years. Around $20 on amazon, or most likely cheaper if you really shop around. ^^^^Here's your answer^^^^ |
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If your going to buy a gauge, and you do need one, this is the one to get. It attached to your caliber and works on all common bottleneck rounds. |
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