Re: Yet another question( Neck Sizing)
Everything you are discribing is relatively typical of the Rem 700 action.
THe burred case mouth is from a couple possibilities.
1. Your cases may be a little long.
2. When you full length size, you may be getting just a tick of loose headspace and when the striker hits the primer it rams the case up into the lead of the chamber. When the round ignites the case walls are blown out and it grips the chamber and then as chamber pressure raises to max, the case head is pressed back against the bolt face.
When you open the bolt, the case mouth is still forced into the lead and as the bolt rotates to open, the case usually will as well with normal loads and it shaves a small burr up on the case mouth.
The small flat on the side of the case mouth is also common with the factory Rem 700. This is generally caused by an overly heavy ejector spring.
When the case is extracted and it leaves the chamber, it is slammed into the right inside of the receiver. Most factory ejector springs are far heavier then they need to be. In a case with a thin case mouth, this will but a small flat on the case mouth.
The cure, install a lighter ejector spring. This is a standard operation when I accurize a 700. Not only does it greatly reduce this problem, it also keeps the brass from flying all over hell and into the dirt while out varminting.
It also aids in accuracy as there isn't as much pressure trying to cant the chambered round in the event the case is a loose fit in the chamber.
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