Welcome to the forum! Lots of good advice above.
My M70 25-06 shoots just about everything well, but especially 115g Ballistic tips. I have used RL26, Retumbo, Magpro, IMR7828 and 4831. All have worked well , but RL26 gives the best accuracy and velocity.
If you get a chance try some 115g...
I've shot a lot of mono bullets over the last several years and had the same problem with Barnes TSX in my son's 243 and in my 270 win. We switched to ttsx in his 243 and they were a little better, but still penciled through on a couple deer. Hammer bullets have been amazing on deer from a 243 win.
My 270wsm was very accurate with 130g Etips and I had excellent results on deer, but I never could get Etips to shoot accurately in my 25-06. I finally gave up and tried lead-free Hammer bullets, bughole groups and excellent terminal performance on deer and coyotes.
My dad was a pilot in the Air Force in WW2, stationed in New Guinea. He didn't talk about it either. He flew a cargo plane and was attacked on take off, his plane caught fire and he was the last one out and was slightly injured. Our Boys took care of the threat.
He passed away in 2012 at the...