While a good bullet, the only "keith" about the MBC Keith is the meplat.
"Keith-style, but with bevel-base
for reloading ease"
Casting ease, actually- but hey, marketing works, and it sounds good to most folks.
All of the other original keith characteristics are missing.
With that said, you should be able to drive those bullets as hard as you want to.
The only real way to get true keiths in any quantity is to cast your own.
While I believe some of the features are overrated, a true flat base bullet has no equal( except perhaps a GC, which is in a sense, a non obturating flat base) in any cartridge, especially the 44.