The 7.62x54r is a .310 diameterbullet, though a .308 diameter bullet can be loaded in the 7.62x54r case, it suffers in the long range accuracy thatit is capable of shooting. Many who reload use the .311 bullet for the .303 British with good results by dropping the powder charge slightly to make up for the slight oversize, when useing 150 gr or less bullets, the 7.62x54r rivals the ballistics of the 30-06. I beleive I have seen Sierra orHornady selling a .310 diameter bullet in the 123gr range that would work well in that rifle also, reload data is becomeing easier to find, choice of brass is limited, I beleive Norma and Lapua are the only makers at this time.