N-165 or H-1000- least temp. sensitive?

[1shot]

This is a question specific to long range use. Of these two powders,,or if someone has something else in this burn rate) which is the least sensitive to ambient temperature changes? Both give me good velocities and accuracy, but I did my work up in 55-60 deg. And I don’t want things to start coming apart in the heat of the summer. Thanks in advance for any input.
Lloyd

 

[JHardy]

I have used a lot of H-1000 in Lapua Magnum based 1000 yd BR guns -- and N-165 as well. H-1000 is much cooler but not as cool as Retumbo.

On the other hand, N-165 is the cleanest burning powder I have ever used. Henry Childs liked it so much he, in part, designed chamberings around the use of 165.

Good shooting,
Jim Hardy