Smaller diameter flash holes?

[Tackleberry41]

I am sure they have come up with some sort of reason. But I thought it was only Speer 357 Sig brass that had the smaller flash hole, one that will break a regular decapping rod. I had modded one to get them out, then drill them to the regular size. I had read Speer did it due to the powder they were using. But some Remington 357 Sig I bought today, it also has the smaller hole. So far its the only brass I have seen it in besides S&B 22 hornet.

[Tackleberry41]

Not talking the primer, but the actual flash hole being smaller, to small for a conventional decapping rod to get them out without breaking or bending it quickly.

[Ola]

Some factories do it because of pressure. The smaller the hole, the lower is the pressure hitting the primer.

F.e. SAKO 7,62X53R cases have a extra small flash hole because that reduces the risk of eye injuries: If the round is shot in Mosin Nagant rifle, and primer is pierced, the pressure will go through the bolt in the striker channel... That is the "official factory explanation".

[tommag]

Lapua ppc brass has a small flash hole, about .060"

[Czech_too]

I acquired some new Herter's .222 Rem Mag brass that had a small flash hole. Was 'told' by the seller that it was actually made by Norma.
Yeah, I've come across the S&B Hornet brass too. Took me a couple cases before I realized what the problem was.