Reloading problem

moosehunter

moosehunter

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Advise please. I havent encountered this before and today I ran into it on two different calibers. Loading for 6.5x284 and 300WM. Belling of the case mouth on fired brass when seathing the VLD bullets after neck sizing, priming and powder charge. The seating of the bullet causes a slight bell in the neck enough to cause chambering issues. I pulled the bullets and resized with the powder in. Then outside chamfered and touched up the inside neck with the chamfer tool and partly solved the issue but what caused this in the first place?
 
Are you positive that is what caused it? As 'Looky says, could be overcrimping. This will cause chambering issues but 2 things mentioned caught my attention. Neck sizing and the problem not going away with resizing. Continually firing neck sized brass will allow it to stretch until it becomes difficult to chamber. The fix is obviously a trip through an FL die to bump the shoulder. Was the bolt stiff on the last firing?
 
Crimping? Crimping rolls the case mouth in. Belling is the case mouth flaring out. When loading for the 45-70 for example, after sizing, the case mouth is belled to assist in bullet seating, then removed during the crimping stage. How can over crimping cause belled cases?

OP. Are you in fact having belled case mouths after seating? That doesn't seem possible. Can you post a photo?
 
hend238 said:
Crimping? Crimping rolls the case mouth in. Belling is the case mouth flaring out. When loading for the 45-70 for example, after sizing, the case mouth is belled to assist in bullet seating, then removed during the crimping stage. How can over crimping cause belled cases?

OP. Are you in fact having belled case mouths after seating? That doesn't seem possible. Can you post a photo?
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Over crimping before the bullet is fully seated can allow the neckto bite into the bullet to stop the bullet
being seated but instead push the neck into the case causing a slight bulge.
Happened to me when my buddies Model 100 jammed.
Dint notice it in my bolt action M77.
 
Neither bullet is crimped. When the bullet is seated the case mouth has a small bell at the top causing the neck mouth to be to large to enter the neck portion of the chamber. On the 6.5x284 I use a Redding bushing die with a .003 bushing, and for the 300WM I use a RCBS neck die. I dont FL size the 300 thus avoiding head seperation issues I do use an Innovative Tech Collet die when the case above the belt develops enough of a bulge to cause chamber issues. A reply suggesting to much neck tension may have something to do with it as Ive taken the expander ball out of the 300WM die resulting in a considerable amount of tension but this doesnt explain the bushing die for the 6.5. The seating die for both calibers is a Redding micro comp die so no crimp function. Trimming is done on a regular basis and if anything I have a habit of trimming to short so no issues with case necks protuding into the lands. I have a few more 300 to put together today so Im boing to put the expander ball back in and see if that hopefully solves the problem. Keep the ideas coming.
 
if you could post a pic of the casse belled it would be good. i have hornady dies for my 30-06 and had a slight bell bulge due to the fact that i turned the die in 1/4 turn too much. The die has a crimper with the seating die
 
Should be any flaring of the case moth on a bottle necked case. That's what the chamfer is for. Sounds like you need a tick more chamfer.
 
kamlooky said:
Over crimping before the bullet is fully seated can allow the neckto bite into the bullet to stop the bullet
being seated but instead push the neck into the case causing a slight bulge.
Happened to me when my buddies Model 100 jammed.
Dint notice it in my bolt action M77.
Click to expand...

A bulge is not the same thing as a bell. Not even maybe.
 
No crimp or bulge. The Redding comp dies dont have a crimp capability. Just a slight flare of the case mouth after bullet seating, barely noticable so I would need a camera with macro to be able to post a pic of the problem but enough to interfere with the round chambering.
 
moosehunter said:
No crimp or bulge. The Redding comp dies dont have a crimp capability. Just a slight flare of the case mouth after bullet seating, barely noticable so I would need a camera with macro to be able to post a pic of the problem but enough to interfere with the round chambering.
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You are on here asking for solutions. The easiest solution would appear to be to stow away all your fancy dies, bushings and what not, then get a set of ordinary Lee dies for each calibre and load away.
 
I think a solution won't be found until there are good quality pics of the problem.

Personally, I've had all manner of problems reloading, but flared case mouths after seating bullets - I can't get my head around that.

With enough information, I am sure the problem can be found and a solution put into place, though...
 
skhunter said:
Have you tried chambering the resized brass before seating the bullet?
Click to expand...

That is the key right there. Throw it in the chamber. btw Are you trimming the brass and then reaming the inside mouth too much and not outside trimming(for lack of a better word) the mouth to create the flare?
 
Found the problem. Pin on the Lee trimmer was to long and not allowing the cutter to go far enough on both cases. 2 seconds with a grinder solved it. Brass was topping out in the die and actually pinching in the lands, yikes.
 
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