44mag is good for deer.
I really like the Ruger Super Redhawk. Last summer I owned one in 44 mag , 480 Ruger , and 454 Casull.
A buddy borrowed the 454 and liked it so much he would not give it back. I did cut him a deal on it to make another purchase.
Depending on where you are at with your pistol shooting ability, the 454 could easily get you to develop a flinch.
I shot my 454 much better using 45 loads than 454. A good shooting glove does help.
I say find a 454 you can shoot before purchasing.