Primers not seating properly? Help!

[phaedra]

As above, the two on the left (Black Hills and Hornady) are very clearly crimped.

The Hornady or Lyman primer poclet reaming bits work well enough or the RCBS primer pocket swager 2 die based system.

Having used several hundred Lake City converted cases with crimped pockets I'd simply advise spending a bit of money and getting some better quality Starline cases from either Kranks or Hannams.

 

[Donkey Basher]

Here are the three makes next to each other.

I'll get a primer reamer/ swaging tool and see what effect that has, if any.

Blackhills & Hornady are definitely crimped so there’s your problem - pound to a pinch of salt, the ones you can seat primers in are Winchester & it’s the other two that are causing the problem.

 

[Smellydog]

Have you got a case mouth chamfering tool? That might do it. Or a CS bit.

 

[Outandabout-goneshooting]

Have you got a case mouth chamfering tool? That might do it. Or a CS bi

 

[Outandabout-goneshooting]

Have bought one of these to give it a go. I did have a try with the normal chamfering and de burring tool but didn't seem to make a difference. Thanks for all the help. Its weird that all the brass I have appears to be crimped. I have some adi factory ammo so I'll shoot three today and see what difference there is if any, with that brass.

 

[KimE]

I use Hornady new 300blk brass never had any probem to seat cci or Murom primers.

 

[Eddie P]

I bought a hornady reaming bit, without the handle and throw it in a drill.

 

[Outandabout-goneshooting]

Thank for all the suggestions. Bought a cheap reaming tool and sure enough, the black hills had a bit of a crimp, the Hornady was just inconsistent ( I think) and the Winchester appears to be fine but just quite a tight fit. The adi cases that I cleaned up worked fine without any reaming. Good to know you can ask for help

 

[Turkish]

This is what you need

K & M primer pocket corrector