Wayne,
I'm in the same boat with the grandkids. Actually just made a "recall" with one of the boys. The one grandson uses a 260 and the other a 257 Bob AI. The 257 AI is becoming a real pain for me to "form" brass and reload for him 120 miles away. I have broke in another factory take off 260 for him on another action and it ended up shooting basically the same load as the other grandsons 260. I am going to swap out the 257 for the 260 and both boys will be shooting the same exact ammo ( much easier for gramps). They also can buy "store bought" ammo if the day comes when I'm no longer here.