"Temp Sensitive" is like "burn rate" in that it isn't an exact science. The temp sensitivity of a powder depends a lot on the cartridge and load used. A small case like the 243 Win filled to the max with 4350 is going to be different than a 270 Win with a "middle of the road" charge load.
Heck, the Navy chose IMR 4064 for Mk316 ammunition to replace M118LR for SOCOM because in that configuration it is less temp sensitive than Reloader15 in that configuration.
Bottom line, all powders are temp sensitive, some just moreso than others.
Machine guns are awesome until you have to carry one.