I have an old 110 action, 1974 model, that I am changing from a .270 to a .300 win mag. I already have the barrel. Now I am going to buy a new bolt because I can't get a new bolt head without waiting and I want to get the rifle to where I can shoot it. Are there any issues doing this? Some of the reading I have done brings up 2 different firing pin sizes and maybe some issues with the bolthead and how the recoil lugs match up to an old action. Maybe there are some other issues? I will get the bolt from Midway probably. I am asking just to know if I can do this and if there are any issues I should be aware of. Thanks!