I am not sure about the accuracy of the PSG-1, but the SVD is widely considered as a Designated Marksman Rifle, meaning that it performs at it's best at ranges under 500yds. Not saying that it won't perform at longer ranges, just that it depends on the shooter and the type of ammo the sniper is shooting.
On the other hand, the U.S. Army's M-24 and USMC's M-40, even though only bolt action weapons, set standards for Sniper Rifle accuracy and reliability around the world. With 100 yard groups at about .50MOA or better as the standard, and the bulk of these rifles in the hands of exceptionally well trained scouts/snipers will group around .25MOA or better.
Now both the Army and USMC are looking at semi-auto weapons to replace the ageing M-21's(also sometimes considered a Designated Marksman Rifle), but they are still a long way off from replacing the tried and true bolt action weapons that all U.S. military Snipers are used to and quialified with.
On the other hand, the U.S. Army's M-24 and USMC's M-40, even though only bolt action weapons, set standards for Sniper Rifle accuracy and reliability around the world. With 100 yard groups at about .50MOA or better as the standard, and the bulk of these rifles in the hands of exceptionally well trained scouts/snipers will group around .25MOA or better.
Now both the Army and USMC are looking at semi-auto weapons to replace the ageing M-21's(also sometimes considered a Designated Marksman Rifle), but they are still a long way off from replacing the tried and true bolt action weapons that all U.S. military Snipers are used to and quialified with.