If your investment in RL25 is just one pound, that's not bad. At least you didn't buy five or eight pounds! where did you find a temp sensitivity resource? My opinion about the RL series of powders is based on my own experience and those of my friends.
As for using match bullets on game, I generally agree with you but there are several notable exceptions. The Amax is a great hunting bullet for deer and smaller game. As for the Berger OTM, a well respected member of this forum 'Broz' used the 230grain OTM this past season to great success on deer size game.
Here's the story I wrote up about my deer hunting this past year with my 300RUM loaded with 208grain Amax going 3150fps.
Annual Hunting Retreat and Amax Review
Here's Broz's thread with experience of the 230 Berger OTM
Berger 230 and 300 OTM Hybrid terminal results
For now I will continue to load the Amax in my RUM. If I get the opportunity to shoot 1500yards or farther, I will switch to the 230 OTM without hesitation.