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Old April 23, 2010, 11:41 AM   #4
Senior Member
Join Date: April 20, 2009
Location: Cape Town - South Africa
Posts: 627

The part you are referring to is the ejector.
Another important question is whether you are full sizing or neck sizing only?

Regarding COL, her is why it does matter:

the depth at which you seat the bullet does matter and it is not unlimited.
I did not say that your bullet is .100 too long, I say that it is likely a full mm too long (or more?)

Rifles of different manufacturers have different free-bores ( this is the distance from the beginning of the barrel to where the rifling begins.
This is why factory ammo, which is made to fit in all rifles has the bullets seated considerably deep in the case.

The fact is that a bullet fits very tight against the rifling.
To demostrate this, try the following.
Take your rifle and first make sure it is clear from any ammo, now hold it upright with the butt on the floor.
Take a bullet (just the bullet), try and force it (sharp side first) into the barrel from the muzzle.

You will now notice that it is a rather tight fit, quite likely that you won't get it to go in at all without a considerable effort.

Now, the same thing happens when your bullet is seated so that when trying to close the bolt the ogive contacts the rifling and this explains why you need to push so hard to close the bolt. When you force the cartridge in two things happen;
1. you are forcing the bullet against the lands (rifling)
2. very likely at some point the bullet is also being pushed deeper into the case.

any of the two will cause pressures to rise considerably.

To check, please do this:
1.Take an empty case that has been resized, but not primed.
2.Seat a bullet as you normally do. make sure the bullet has not scratches or nicks.
3.Insert the dummy (this is what reloaders call a cartridge that has no primer and powder) in the chamber and close the bolt.
4. Extract the dummy slowly, so that it does not fall to the ground.
5. using a good light and magnifying glass, look for marks of the rifling on the bullet ( they will be on the part that is of the rifle's caliber), if they are there your bullet is sitting agains the lands. if they look like score marks, you are forcing the bullet hard agains the lands.
6. now measure the COL and see whether or not the bullet has been pushed into the case.

Please let me know the results of your tests. Also, please remember that I am trying to assist you, I have no reason to give you incorrect or misleading answers.



Last edited by Dannyl; April 23, 2010 at 11:57 AM.
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