Don't know?? As John Taffin says, "each gun is a law unto itself". You are going to have to try each individual bullet to see if they work in your gun.
I have shot several thousand of the the above mentioned 355gr Leadheads and they work fine in my gun. They are a WLNGC, sized .476 below the crimp grove and smaller in front, so they fit in the tight chambers of my FA. Overall lenth is fine also. With that said, I don't know if they will work in your gun.
If the 375gr LBT you are referring to is from Montana Bullet Works, it has a crimp to nose length of .395 which is going to be to long for the cylnder if crimped normally. You will either have to crimp above the crimp grove or trim you cases. Also, Montana Bullet Works will size these bullets either .475 or .476.
Don't know about the 325gr Lee, but the 400gr Lee is a bit too long (.390 crimp grove to nose) to crimp normally. Using Hornady dies, I shoot/have shot a bunch of these (Lee 400gr) crimped slightly above the crimp grove using 20.0gr of 2400 without any problems. In my gun the 400gr Lee, sized .476 using 20.0gr of 2400 is a very accurate load. It runs right at 1,100 fps.
If you happen to get some bullets that won't chamber due to tight throats, you can get serviceable ammo by either crimping in front of the crimp grove, or by trimming you cases. Remember, the shorter OAL will reduce powder capacity a bit, and you will have to reduce powder charges accordingly. I'm lazy, so I crimp in front of the crimp grove. Example, the 400gr RCBS SWC, can't be crimped normally in the FA -- using 19.0gr of A2400, crimping over the front drive band chronographs about 1,160 fps at 80 deg F, while other 400gr Cast Bullets will run slightly under 1,100 fps.
Montana Bullet Works
www.montanabulletworks.com lists crimp to nose lengths for most of their bullets. You can also call Dave and ask him about specific bullets in the FA revolver.
Ultimately, you will have to figure it out by trial and error.
FWIW,
Paul