You mention in the rimfire picture that you need a .26 Remington rimfire...
That was two things...a typo and a bad choice to add. At the time I was trying to think of more rimfires and it popped into my head. What I was thinking of was the .267 Remington Rimfire which did exist, but more as an experimental cartridge. It and the .25 stevens are very close. Much like the .22 Remington auto rimfire and the .22 Winchester Auto rimfire.