There’s a chart somewhere showing the temp sensitivity of most powders, but in practice for me, it hasn’t meant a hill of beans because I’m looking for center-punches on steel and I’ve gotten that consistently for 10 years straight using CFE223 under 123gr A-MAX from my 17.6” lightweight Lilja Grendel build.
Maybe if someone is chasing Xs it means something, but I just have not seen it manifest in the real world, and that includes me shooting out to 1000yds on large gongs where you can see all the impacts. I’ve rapid-fired 6rd groups at 1000yds with that set-up that were sub-MOA, 8” vertical and 4” horizontal.
Had I been using 8208XBR or AR Comp, could I have shrunken the vertical down to 4”? Maybe, but dang man, it’s 1k and I just want to hear and see impacts where I expect them. We are so freaking spoiled nowadays with information, much of it that might be detrimental to getting out and shooting. If I was shooting more at 1200-1500yds, maybe 8208XBR and AR Comp would be better for that.
This past winter, I found a box of that same ammo I loaded back in maybe 2015 (Lapua brass, 31.2gr CFE223, Rem 7.5 SRP, 123gr A-MAX), put some in a mag in the same 17.6” Lilja Grendel, same scope, same mount, etc. and dialed in what my program said was solid data for 600yds, then center-punched the steel 1st-round. Same load shot around 1 o’clock 5” from center at 1000yds back in 2014 at 50˚ higher temps than the winter sample results.
This is better than “good enough” for me.
I haven’t loaded much with TAC other than for my 100gr Nosler Ballistic Tip development back with my 16” AA Grendel barrel back in 2009-2010.