"TAC, like H335 and A2230 work wonderfully well in .45-70 and .458 Win Mag with heavy-weight bullets."
Please add the .405 WCF to that list.
I did a lot of work with TAC in my 1895 .405 with 400 grain Woodies for Cape buff in Africa.
In the end, the final load had ZERO (0) fps deviation at 48,000 psi and looked and smelled like a clean burn.
So, I packed it in and packed my bags and took this buff in south east Limpopo:
BUT, I did not like the TAC peak pressure spike and switched to VV N133 and replicated the velocity with a peak pressure of less than 40,000 psi.
This allowed me to shoot the same velocity load in my .405 DR and tuned it to regulate just fine.