What does it mean when....

[Tumtatty]

I was out shooting my Arisaka Type 99 today. I've shot it once before with Norma rounds and it functioned fine. Today I used CB (with the Norma brass) and with each shot I could feel hot gasses blow against my forehead.

The brass was heavily tarnished after the shot as well....
What does that indicate?

[JSnover]

Light loads? I cured the same problem in my .357 and 45-70 by raising the presssure, so the case sealed the chamber. I also noticed a lot less of it after the cases were formed to my chamber.

[Ricochet]

Yep, light loads don't seal the cases against the chamber wall. That happens to me whenever I shoot a Mauser with those light 1970s steel cased 8mm Romanian export loads as well.

[Tumtatty]

Ahhhh!!!

I was only using the starting load of 16 gr of 2400!! That was probably my problem!

Thanks guys!!!

[runfiverun]

you can leave enough of the neck flair in place to block those gasses too.
it takes a bit of sperimenting but you get the idea.

[TAWILDCATT]

I dont get that with 13.5 gr red dot.and I use that load in my 1903.with 311291
I get 1680fps

[bruce drake]

Yes. Light pressure will give you a wonderfully puff of warm air. My Type 99s did the same until I bumped up the loads.