I have followed the same rationale as
@MS 9x56 - factory loading for all calibers - .308Win , .30 - 06 Spg. Fld , .300WM , .338WM , .458WM, all of which are post-64 Win M70s , but the .458 is the only CRF.
Also, factory loading for Win lever action in .30-30, and factory loaded Garand ammo for a Rem 742
The caveat to not using factory loading is if a particular projectile anatomy/grain isn't offered , powder charge/loading is anemic , and/or accuracy is sub-par.
I primarily hand load for non-mainstream calibers like the .358Win we have.
I also hand load .38Spc , .357Mag , and .44Mag for pistol(s) Ruger(s) SP101 x2 , GP100 x1 , and Rossi lever action in .357Mag , I find that pistol calibers in factory offerings are anemic for "backcountry" defense. Any MFG pistol ammo that is loaded to a proper i.e. original development spec , the MFG designate that ammo as P , +P or +P+ and over charge. We also reload defensive carry ammo in .357Sig , .40 S&W , 10mm , .45ACP , .45LC ....
The only exception to not hand loading any of the above would be, and using a MFG loading would be Buffalo Bore.
The only other exception would be a custom AR 10 variant - 7.62x51 / .308Win that we use Garand factory loading and a custom handload that I put together. The other is a recent custom AR 15 variant - 6.5 Gren that I have used a factory loading to test function, but will be following a similar path as the AR 10, find a factory loading it likes and a hand loading.
I do have a Sig 716i that eats anything I've loaded it with. The only exception is hunting loads that give an occasional short stroke, but have never fired a hand loading through it.
Anything else - rifle & pistol - in the closet is fed factory loads. Shotguns are an entirely different mindset/topic.