It's doubtful the OP rifle will stabilize the heavier - longer 6.5 bullets. And if the .260 barrel is good now, improve it and there's nothing better.
Mr. Forbes is a good enough 'smith to recognize that Remington's decision to give the 260 a 1-9" ROT was a poor choice and would have built his 260's with a faster ROT that would handle all bullet weights.
Yes, and the NULA Model 20 also has a 3" magazine, so could handle longer bullets.
Which is why my .260 is a Tikka T3, one of a special run ordered a few years ago by Whittaker Guns in Owensboro, Kentucky with 1-8 rifling twists. T3s also only have one action length, but use different detachable magazines for different-length cartridges. My rifle shot more accurately after I modified the "short" magazine to take rounds up to 2.95" in length, so could seat longer bullets close to the lands.
