It makes sense to use the manual by the bullet manufacture you are using. You wouldn’t use a Ford Manual for a Chevy.

Most bullet manufactures note the Gun used, barrel length, twist, Case used, the primer used, for the bullet and powder used. They usually all tell you not to start at max load, work your way up. The fastest speed is not always the best.

Starting out reloading most have an idea of the factory ammo they like best, the bullet they like best. Get the manual for the bullet you like best, do not start at the Max load, any of the manufactures more than likely are not using the Max load in their Premium ammo anyway. They have done extensive experiments, and have found the lowest and highest safe load for that caliber, cartridge and bullet. Just like using the Ford manual for a Chevy, just because your speedometer on your car says 150 mph don’t mean you should drive it that fast. And 150 mph more than likely is not going to get you the MPG rating either, or the optimal handling. You don’t take the average driver off the street and put them in a nascar. Nor do you expect Nascar performance, out of them or a car off the show room floor. Just because it says Ford on the Nascar, does not mean it has all Ford parts, it sure as heck don’t use the same fuel. It is not going to turn right as well as it does Left, or as well on a flat track as a banked one.

Point being hopefully,if you are starting reloading, this is not your first gun and Never shot or hunted before. You have some idea of the bullet you like, caliber and cartridge. You can buy Nascar quality equipment to start with, or the things you need, and everybody has an opinion on the things you need.