UMC .303 ammo question (pics)

[vellnueve]

Does this look right?

It's like the .303 casings aren't formed completely. Should I be worried about reloading these since they've obviously expanded significantly (at the neck) during firing?

Rifle is a No. 4 Mk 1/2.

 

[jhrosier]

It is not unusual for Lee Enfields to have deep chambers.
It was done on purpose to allow easy chambering.
It does not help the reloader, however, your case life will be very short unless you segregate the cases by rifle and only neck size.

 

[vellnueve]

Well, I only have two types of ammo (UMC .303 and Prvi Partizan SP) for one rifle, so I'm assuming they'll all blow up to the same neck size.

 

[1903Collector]

I have seen the same thing with 30/30 factory cases, the shoulders seem smooth and more curved rather than sharp and distinct. Fired them with no problems. I think it's just the way there manufactured.