Major pressure in the rain

[1jonathan1994]

My friend and I both had pressure problems with proven loads while shooting in the rain today. We had to stop shooting. What's the remedy for this? If we should reduce our loads how much by? We used an umbrella to keep the bullets dry.

42.2 of H4350, 140eldm, hornady brass
41 of H4350, 140eldm, Lapua brass.

 

[Herstal 12]

If your brass got any amount of rain drop on them it will blow the primers out, keeping your ammo dry is crucial.
I hope this helps.
Cheers

 

[canezach]

What @Herstal 12 said! If water gets onto your rounds or into your chamber, it is occupying space and water does not compress very well, so you basically shrank your chamber

 

[Herstal 12]

That’s what I tried to say but canezach did better lol
Cheers