The 86-90 gr. bullets are the standard for .25-20, and it's all I've ever used in them. Not sure you can even find lighter .258" bullets suitable for the .25-20 these days?
Winchester used to list a 60 gr. and an 86 gr. as a factory load, but my two boxes of original .25-20 M are both 86 gr.





Twist rate for the Marlins in .25-20 is 1:12".