7mm WSM temperature sensitivity

[rogn]

Working up loads for a hunting trip with Barnes 160gr TSX bullet. Seem to be able to get consistant velocity and accuracy with H1000 and RE 25. This is a long bullet and loads are compressed. The local weather is running in the 30s to low 40s while working the loads up. I was wondering if anyone has experience with these powders and any tendency toward temperature sensitivity or peaking as temps rise.

 

[Jeffvn]

I've been shooting the 7WSM for at least 6 years now in F-Class and the occasional tactical comp. I do not have any difficulty shooting my same load in all weather conditions in Las Vegas or in Houston (where I lived before Las Vegas), but I would not work up a load in the winter and expect it to shoot well in the 115 degree temps out here. Although H1000 is mostly temp insensitive, the temp swing is simply too great to go from low 30s high 20s to 115 to trust it in the heat of the summer. RL-25 has a higher temp swing than H1000, but ran faster in my rifle.

Jeffvn

 

[bwaites]

H1000 seems to be ok for me from around 30 to around 90 or so, without changing loads.

I haven't shot it at 1000 in hotter temps than that, but didn't have any pressure signs, so I'd be willing to try it.

Below 30, I've shot it, but not at extreme distance, so I can't comment on accuracy.

RL25 and RL 17 both seem more temp sensitive to me. I get more velocity from RL17, but can't find the accuracy with it.

Bill