223 PMC brass problem

[ronas]

The length of brass is trimmed to 1.755, it is once fired brass.

Problem is I can seat the bullet to have correct OAL but the bullet is not snug enough to keep from moving inward when I test it by pushing it in on the workbench. Could not even put enough crimp on it to keep it from movng.

I'm loading on a 650.

I usually use LC or IMI brass and have never had this problem. Last night I reloaded 250 rounds using old LC brass with no problems.


What might be going on and how should I fix problem?

[J-cat]

Overcrimping? If you overcrimp, you will buckle the case neck away from the bullet, thereby decreasing neck tension.

[stover]

What bullets are you using? Depending on the rifle and bullet you may not want to crimp. I don't crimp .223 SMKs for my AR. What kind of sizing die are you using?

[ronas]

What bullets are you using? Depending on the rifle and bullet you may not want to crimp. I don't crimp .223 SMKs for my AR. What kind of sizing die are you using?

Bullets are Remington fmjb with cannalure, 55grain.

Rifle is Larue OBR 556.

Dies are Dillon and sizing die is carbide.


I never had this problem before but I never used PMC brass either.

[stover]

Bullets are Remington fmjb with cannalure, 55grain.

Rifle is Larue OBR 556.

Dies are Dillon and sizing die is carbide.


I never had this problem before but I never used PMC brass either.

Sounds like you should be good to go with a crimp. I'm using Dillon dies too. Maybe try playing around with the crimping die. PMC brass is not the best but not the worst either, maybe try trimming the brass to just under 1.760 and see if it does anything.

[J-cat]

Crimp does not prevent bullet setback

[ronas]

I think I solved the problem.

Cleaned inside of case neck with denatured alcohol. When I loaded a round bullet did not slip. I think I must have had residual lube in the necsk causing bullet to slipe.

[killshot44]

PMC brass is thin at the neck. I use bushing dies and use a smaller bushing for PMC (.244) than I do for Lake City or Lapua (.245/.246)