New press, new loads, excessive pressure????

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sfbruner

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I am new to reloading and just finished loading my first 100 rounds of 9mm ammo.

I used sellier and bellot pistol primers
Win 231 powder - 4.0 gr.
Once fired win brass
.355 124gr. Copper plated RN bullets (Aim)
C.O.A.L 1.092 inch
Taper crimp (there was a very light imprint around the cases at the level where the bullet was seated, very faint, but enough to bend the light such that I can see it. Is this normal? No imprint on the plated bullets....i pulled some out to check.

I went to the range and had only one misfire...wouldnt fire on second try either so it must have been a bad primer. The 4.0gr load is a light starting load and shot as such (very low recoil and cases landing a foot behind me). Zero issues feeding or ejecting.

So what is the problem? All the primers are cratered and 6 had black residue in the dimple. Other than this the load is light and accurate and performs.

Any thoughts? Thanks.
 
switch to CCI primers, that might solve the cratering etc, as far as load data I don't have a book near me to check. On my 40S&W I taper crimp and there is about 1/16" of "polished" brass at the top of the case that shows it has been contacting and pressing against the sizing die. My sig hasn't had a hiccup doing it this way yet.
 
Light loads sometimes do not expand the case fast enough to keep it from slamming back against the breech after being pushed forward by the firing pin, thus cratering the primer. Sometimes a mid level load will eliminate this problem.
 
Thanks all. Ill give it a try with a slightly higher load.

On a positive note the LNL AP is fantastic. I am very pleased with it, im sure a seasoned reloader would appreciate it even more.
 
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