Some new thoughts (contoversies?) needed
My printed guide for reloading when I started was the Norma Gunbugs Guide. Since I was using Norma powders exclusively, this was very handy. They listed their most suitable powder for a given weight bullet in a calibre, in the ussual three charge steps- start, med and full.
They did not distinguish between different makes, or styles, of bullets. That is, a 180 grain bullet for a certain charge in a 30-06 say, was just that; a 180 grain bullet.
That's how I started and in all the years of loading since, I have never been able to determine the slightest difference in pressure between any bullets of the same weight in any calibre.
Thus, if tomorrow I bought a brand of bullets I had never before used in say, 180 grains for the 30-06, I would look at my notes for the rifle I was going to load for, then put in the usual charge of the powder I wanted that gave me my usual, standard load. Note I said the rifle I wanted to load for. There is often a big difference in rifles of the same calibre. I have two bolt action 30-06s. One will take, with no sign of high pressure, whatsoever, what will stick the bolt on the other 30-06. I have exactly the same situation in two bolt action .243 rifles. Therefore, I must carefully mark my reloads for the rifle they are intended for. But to repeat, I have never determined any pressure change, whatsoever, from interchanging bullets of the same weight, but different shapes or makes.
The one componet that does make a difference is the brass case. There is considerable weight difference between different brands of cases and the heavy cases should be loaded lighter than the light cases. This is because they are all the same size on the outside, so if they are heavier, that means the extra metal is on the inside, making the capacity of the case smaller, resulting in higher pressure, if the same charge is used.
Most modern reloaders tend to treat each brand of brass case seperately. Instead, I just go by weights. If my old Norma, CIL and Winchester all weigh very close to the same, what difference does it make who made them? Remington used to be the heaviest I had, but now I see some Federal are in the same weight range, so they go together.
What I have written above is written just for entertainment, only, and no way is it meant to influence how you reload ammunition. Just do things your way, and do not consider any of this as instructions on how to reload.