I have a 260 TRG on order with the Sako 3 ring 34mm mount. What size cheek spacer are people running with that mount and a 50-56mm objective? I will be putting a Hensoldt 56mm scope on it.
I found that a 10mm spacer works perfectly with my S&B 5-25x 56mm PMII. I have the S&B mounted in a Spuhr 1.38" mount which is slightly shorter than the Sako 3 ring mount. Any higher than a 10mm spacer will not allow be able to remove the bolt without removing the cheek piece first.