Which method you choose just be consistent. That is the goal of annealing every cycle. If you are just extending the life of the brass by annealing every four or five reloading, anneal first.
The only difference is the vertical measurement if you are just getting in the ballpark.. MOA 1/4 click = 1/4 inch at 100 yards- MIL 1/10 click or about 3/8" inch. one mil is basically 36" at 1000 yards MOA= 10". the math is the same ie MOA @ 500 = 5"; MIL @ 500 =18"
I just ran a cost comparison on my son's 7x57. Shelf price is about $3 per round and our reloading price is .93 at today's costs of primers, bullet, and powder. Big difference is 1/4 moa versus 1 to 1 1/2 for factory. We anneal which extends the life of the brass, lowering the cost.
I use both Whidden and Forster. There are some additional more expensive brands but as you can see on the above threads many options are available. You might start with Forster and as you decide this is an investment you want to make, work up to where you are satisfied with the consistency you...
I have rebuilt two rifles using boyds and have not been disappointed. The second one in the process I had them install pillars and they were a perfect fit. I did bed both.
I used Copper Creek Ammo a couple of times just to see what they offered. You might check their website for pricing and how they work up and charge for that service.
When ever I am asked this question, I always tell the story written by Pat McManus in Outdoor Life. He recommended a 357 mag with the front sight removed and polished. This was for when the grizzly took it away from you and shoved in up your backside; it doesn't hurt as much. The moral of the...