Puff of air hits my face. Just before my Mosin fires.

[BigAlofPa.]

I had this happen before. I adjusted the firing pin. Thinking it was slightly piercing the firing pin. It did it again yesterday. One time out of 40 rounds. I checked the primer, No piercing. It's not a hot or warm puff. Strange it does this now and then. Sure has me confused.

[Gewehr-Guy]

My Swiss 1889 used to do that with light loads that didn't expand the necks enough. A slightly heavier load solved my problem.

[Winger Ed.]

Sounds like Gewehr found the problem & has a solution for ya.

Is there a large, or an unusual amount of soot on the case?
If so, the brass isn't expanding enough to seal the chamber, and you're getting gases blown back around the case.

[BigAlofPa.]

The case did not have soot. But the bore had an awful amount when i cleaned it. It looked like when you clean an oil furnace. I was running with green dot 14 grains. 150 grain speer bullets.

[Gewehr-Guy]

Just an afterthought, but were you using .308 jacketed bullets instead of .311 dia ? That might cause some blow by, and not let the G Dot to burn properly. That GD load with a full size cast bullet should shoot OK.

[BigAlofPa.]

I doubled checked. They were .311 speer hot core 150 grain bullets.

[DCB]

I might as well throw my hat in.
excessive head space OAL on the cases. loose primer pockets on some of the brass. before the primer reseats on the reward thrust.

[BigAlofPa.]

The oval all cartridge length i have at 2.920 with the 150 grain speer. The casings i trim to what the lee trimer and lock stud does them at. The primer pocket is a good call. I still have some to de-cap. I'll pay attention to see if any primers come out real easy. I only loaded 20 rounds after my last outing.

[armoredman]

She's just blowin' ye a kiss!

[Texas by God]

She's just blowin' ye a kiss!An eye drying kiss!
Our .30 carbine did that when I first started using cast. More powder fixed it.

Sent from my SM-A716U using Tapatalk

[BigAlofPa.]

I like that about she's blowing a kiss. I'll give the charge a bump if it does it again and the primers are tight. I was going to sell the rifle. I was all over the place group wise with the scope. I had to really lean into the scope to see. Despite it being long eye relief. I shot it after i put the irons back on. And it groups decent now. Im more relaxed with the irons. I put the scope on my 10/22. It works fine with it.

[alfadan]

Seems like an odd load to use with jacketed bullets.

[BigAlofPa.]

I use it because it saves on rifle powder. I don't need full power loads for range fun. I use it in all my rifle loads. When i want some varoom ill use my 4895 or varget. :D

[ulav8r]

How does it puff BEFORE firing?

[BigAlofPa.]

The puff is a split second before it fires. Yeah it's weird.

[gumbo333]

Blowing a kiss-what? I think it's blowing you something else, don't mix so many beans with that green dot.

[BigAlofPa.]

Took it out to the range today. Ran 60 rounds through. No puffs of air. The load did well nailing steel out to 300 yards.