Never tried either, but had the 2013 manual on the table- As a side note the 6.5 Creedmoor and 6.5 x 55 show very few loads on no bullet heavier than 107 grns as well.
The Hodgdon 2013 Manual/Annual lists only two for the Remington 260:
95 gr Hornady Vmax - starting at 40.4 and max @ 43.0
107 gr Sierra HPBT - starting @ 39.7 grains and max @ 42.2 grains
Hope it helps.