9MM Re-Loads

#1 · January 18, 2010, 5:21 pm

I've been reloading for years (single stage) and recently purchased a 550B. I'm now using Dillon Dies, loading SNS 9MM 125LRN. Everything is working fine but notice more difference in case size when measuring at the top of the case (.377), to mid-point of bullet within the case (.380), and just below base of bullet within the case (.374).

I'm not too concerned about the measurements but I can almost see/feel the difference with the loaded round which is why I thought I would post this thread and a picture. Not sure if you can see the difference I speak of/have measured - would appreciate any thoughts before I proceed further.

Thanks

9MM_Reload_001

#2 · January 19, 2010, 3:21 pm

This "coke bottle" shape is normal to a reloaded 9mm case, because the case is tapered. The neck is sized straight, so it is tight enough to secure the bullet. the result is that the base of the bullet is visible in outline, as the case below that is sized smaller than the bullet diameter. This ensures the bullet does not push back into the case when it is fed into the chamber.

#3 · January 19, 2010, 4:34 pm

Great - appreciate the information - I feel better.

#4 · June 15, 2010, 1:55 pm

I'm having the same problem....2 things, if you have any jams, it's because your base, right above the extractor rim is to big (greater than .391), if that's true, drop your die down a little bit more till it's +-.002 under .391. Also, DP sells the EGW chamber checker part number: H81-19846, run those through the checker to make sure they are within spec.