RE: Good accuracy out of Marlin 45-70
I have a 1895 CB and it shoots great. 300 gr. Federals will shoot 1 1/2 at 100 yrds.
I will not use a Remington becuase they don't seem to hold together. (although I have not tried the corelokt ultra)
My all time favorite is the Hornady 350gr., they have good accuracy and pack a good punch and don't fragment.
I also have tried with good success a 385 gr. hard cast bullet.