Precision rifle services in the UK and Martin Menke here in Germany have built custom rifles
based on the Sako 75. We have a Sako 75 as a club rifle in our garrison gun club, it is a 308 wityh a nice walnut stock and it shoots very well, Sako is a nice rifle, personaly i would choose the Sako TRGS over the 75. but basicaly all they need is a picatinny rail screwing on(and i know some one makes a picatinny for the Sako) and they are good to go. Of course you can get a shed full of bits to fit a Remington 700 and they can be made to shoot very accurately and some even are very accurate with the factory barrel still attached, i have a 308 that used to be a 22.250 VLS that i rebarreled with a factory 308 barrel that i begged in a gun shop, with a trued action it shoots 1/4 inch groups with Norma factory ammo.
Have you looked at the Tikka T3.. here you have the same quality as the Sako but at Remington price, i saw a Tikka T3 Tactical at the IWA this year and it was a nice rifle, all it needed was a McMillan A3 stock. I am not sure they are available in the caliber you require but they are worth a look anyway.