Well, there are a lot of military rifles out there with full stocks, that reach to the end of the barrel or within a few inches of it that are very accurate, as long as they are set up properly, the bores are in good condition and of course, the wood used in the stocks has been cured and properly sealed. Warpage is the biggest enemy.
Every Ruger I've owned, has needed to have the little tang screw drilled and tapped to keep elevation consistent from round to round. Now, I'm an accuracy freak so that doesn't mean the Ruger No1 rifles aren't adequately accurate for hunting accuracy out to 300 meters, right out of the box.
That RSI the OP is questioning about, is likely fine for his/her purposes. It's up to you to learn the limitations of the rife.
Now, those short little rifles are very handy. They also kick like mules and the muzzle blast can be blinding.
The 7x57, a truly great cartridge/bullet design is one of the best out there. In modern rifles, such as the Ruger No1, the loads can be increased substantially. In all honesty though, the factory loads of 140 to 175 grains will do everything demanded of them and then some. Not only that, the felt recoil will be much milder.
The shorter bbl, pretty much negates hot loading as much of the powder will not be effective anyway. Remember, the 7x57 was designed to burn the available powders of the day, in 29 inch bbls. Some later powders might give you a smidgeon more velocity, but at what price to the shooter??