You need a bigger press too 1.25" hole with 12 tpi. Original case should be 2" long as well
Edit; and do try the cardboard tube trick, it works quite well IMO. Thanks Smellie, credit where credit is due.
It's an original Snider loading trick. A piece of (non-corrugated) cardboard 0.030 thick by 1.25" long X 1.70" ( the last # is my reckoning, worked for me ). I rolled it around an 8 x 57 case so the 1.25" is top to bottom and thus the 1.7" is the circumference.
Insert it into the formed brass and give it a 'stir' to expand it around the ID. Deposit 80 gr of FFG into the case. Fills it right up to the bottom of the Lee hollow base 530 gr.
Fill the Hollow base with wax to ward against an air gap in the loaded round.
Insert the bullet so the lube rings are just above the edge of the case and drip wax into the rings. The excess wax will nicely allow the case to grip the bullet upon running it into the seating die. Without this the Lee dies or the Lee bullet size or a combination of the two...won't grab the bullet securely enough to call it a successfully loaded round. It'll spin and likely fall in or out I've found
The card board tube can be made a tad longer so the bullet ( or ball if you'd like) will rest on the edges of the tube; holding it in place til it's run through the seating die. This will reduce your load somewhat, but that may be to your liking. You could (with patience) likely tailor loads to your desires.
BTW, I've found that welding rod boxes, being more robust are a perfect building material for this trick.