Hornady, makes soft point bullets and Graf, makes boxer brass. .329, is the correct diameter
db, that drilling you had, may have had a .323 or even .318 bore. I had one about 35+ years ago, in 8x56R, with a .318 bore. I used the .323 diameter bullets in it all of the time I owned and shot it. The 16 gauge upper was the real problem. It had a very short cartridge case and I had to cut down hulls and go through a lot of hassle to make ammunition for it. Back then, the only 8x56R I could find, was made by Norma. $25/box, in 1972 was a real strain on the pay cheque. I was fairly new to reloading, and couldn't figure out why the Norma rounds kicked so hard. I knew Norma, loaded on the hot side but this was ridiculous. I ended up pulling the bullets out of the last two bullets and found that they were indeed .329. It was almost impossible to find any .318 bullets, so I split the difference. Nary a pressure problem. .005, is a tiny difference and the generous leade in the chamber swaged things down nicely.