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I belong to that school of thought that doesn't believe crimping helps setback very much and too much crimp hurts a lot.
In sized brass with correct diameter bullets the brass wall provides the lions share of the support. Look at a freshly sized brass wall and look at a loaded round. Is the brass "bulged" where the bullet is seated? For the bullet to go deeper in must "resize" the brass; which should take some force.
However, if you over crimp (think about the profile in the crimping die and what it is doing) you can actually deflect the brass and loosen the grip on the bullet.
Of course, this discussion makes the assume that the problem isn't a feeding problem where the bullet is impinging on the feed ramp (or something else) at too steep an angle and is being driven home by a 20# jackhammer spring. Nothing short of LockTite Red can help that situation.
Oh yeah, I forgot your other question. Reduced OAL increases pressure. In extreme examples this could be bad.
[This message has been edited by WalterMitty (edited 11-17-2001).]
In sized brass with correct diameter bullets the brass wall provides the lions share of the support. Look at a freshly sized brass wall and look at a loaded round. Is the brass "bulged" where the bullet is seated? For the bullet to go deeper in must "resize" the brass; which should take some force.
However, if you over crimp (think about the profile in the crimping die and what it is doing) you can actually deflect the brass and loosen the grip on the bullet.
Of course, this discussion makes the assume that the problem isn't a feeding problem where the bullet is impinging on the feed ramp (or something else) at too steep an angle and is being driven home by a 20# jackhammer spring. Nothing short of LockTite Red can help that situation.

Oh yeah, I forgot your other question. Reduced OAL increases pressure. In extreme examples this could be bad.
[This message has been edited by WalterMitty (edited 11-17-2001).]