Pressure signs in hot weather?

[Mendy300wm]

Gun is a AW300wm the load Berger 210vld, 75g H1000, rws brass, WLR primers. When I worked this load up it was 55 degrees outside pushed these on average at 2888fps with a SD of 8.

Went over to easten Washington this last weekend to do some shooting 100degrees outside started getting pressure signs almost immediately, extractor marks, stiff bolt lift, velocity was up to 2930fps.

Is the only way to fix this problem to back the load down a bit so I can shoot in all weather? Or just leave it and deal with the over pressure?

 

[Steel head]

It's been super hot over here.
I run two loads for my rifles, one for spring, winter and fall and one for summer.

H1000, isn't that one of the extreme powder.

 

[Mendy300wm]

Yeah I guess, I got 1.1fps per degree....

 

[Darkker]

The "Extreme" properties only apply within very specific conditions, not universally.
The velocity is the tell, yes to hot for my side of the state. Old ball powders don't like my weather unless you back then down.

 

[40xs]

I suggest you stop using those loads in hot weather and load new ones for summer temps. You are probably stretching your primer pockets with those loads in hot weather at the least.

 

[MitchAlsup]

Is the only way to fix this problem to back the load down a bit so I can shoot in all weather? Or just leave it and deal with the over pressure?

I suggest you work up a load during this scorching hot period of time, and then use it during summer shooting seasons, reverting back to the other developed load for cooler periods of the year.

Just to be sure, you should shoot the loads developed in hot conditions to see if the accuracy remains acceptable and you can simply have 1 load for all seasons.

 

[Victor N TN]

It's been super hot over here.
I run two loads for my rifles, one for spring, winter and fall and one for summer. ...

Be sure to mark the boxes differently. I use "Sharpie" colored pens and mark the extractor grooves. Red for hot load. Blue for cold weather load. Green for target loads etc... Just roll the brass while holding the marker point in the extractor groove. BE SURE to mark the boxes as to which load it is and what it's for. Little yellow sticky notes inside the lid are your friend.

Good luck.
Victor

 

[Victor N TN]

It's been super hot over here.
I run two loads for my rifles, one for spring, winter and fall and one for summer. ...

Be sure to mark the boxes differently. I use "Sharpie" colored pens and mark the extractor grooves. Red for hot load. Blue for cold weather load. Green for target loads etc... Just roll the brass while holding the marker point in the extractor groove. BE SURE to mark the boxes as to which load it is and what it's for. Little yellow sticky notes inside the lid are your friend.

Good luck.
Victor

 

[308220]

Just back your load down half a grain when you know your going to be shooting in 90+ degree temps in direct sunlight. If you dont use BR2 primers, you could use those too. Theyll knock your pressure down along with about 100 fps. Easy fix.