These days I mostly shoot 308. I use Lake City LR brass, Fed 210M, IMR 4064 and SMK 175s. I have a Rem 700 with stock bolt and a Bartlein barrel, McMillan stock and nicer trigger, and nice glass. The barrel is fouled - probably 250 rounds through it. This morning I grabbed a box of my reloads off the shelf and took it to the range. I shot prone, off a Harris bipod, with GameChanger rear bag, 100 yards, shooting platform was a wood deck about 10 feet high.
I always start with "cold bore plus four" - two 1/2 inch dots, shoot cold bore shot at the top dot and four more at the bottom dot. Cold bore shot was just right of center, above and just touching the dot. Plus four was 0.653 edge to edge, so 0.345 or .330 MOA. Group was just left of center above touching the dot. Had all five shots been one group, it would have been a 4. I am not a great shooter, this is not a great gun, and instructors have not complimented me on my technique. I can't afford the 419 press and, more to the point, a press is not going to fix what is wrong with my shooting. The solution to that is trigger time, discipline, record keeping, and training.
All that being said, 419 good on you. I am glad that someone is making a product like this - it is beautiful, precise, and a real tribute to the machinist art.