^ I also like the factory bolt knob, but there seems to be some folks who want an aftermarket oversized knob, I personally have no need for it. My T3 is a hunting rifle, I need it to be light, strong, MOA accurate, and reliable. no more... If I need to paddle upstream with it, I will, no hesitation.
I personally would not try to rework the mag to accept a longer OAL round. If guys really need to have the bullets that close to the lands, then they should be single feeding anyhow. No need to be 10 thou's off on a hunting rig IMHO. A nice lightweight and STRONG bottom metal that accepts factory mags is all thats really needed. If you can reproduce the factory mag out of aluminum at a good price, they might sell, they might not... wouldn't be a huge improvement from the factory plastic mags me thinks, I've seen a demonstration were a sale's rep was jumping up and down on a mag to show how strong it was. It didn't break. Also messing with a new mag configuration could lead to feeding issues.
just my 2cents.