Changing bullet "brands", effect?

[Tune_up]

Relatively new to reloading, I have worked up a load for my .270 and a 130g bullet. I tried five or six powers and varied loads by 1g from minimum to 0-.5g from max. Shot 3 shot groups and took best and continued to refine/shoot until rifle is shooting good.
Question #1. If I change from current bullet to another brand 130g bullet will I need to start all over with different powders? Or, just "tweak" the load.

Question #2. Do you pick a bullet and develop a load, or develop a load and then see how different bullets of the same weight affect POI.

 

[The Bushmaster]

You have the right idea on both questions. All will work and will keep you busy.

I usually try several bullets with each powder in a particular rifle (or handgun) and the best bullet/powder combination is the one that I tweek. My .30-06 likes H4831SC and 165 grain HPBT and my .30-30 likes W-748 and 170 grain Speer HCFN for two examples...

 

[jwr747]

for the most part,as long as the bullet profile is the same,shouldn't see any change.boat tail to flat base would probably be a big difference.from my load development for some K-31's I couldn't see any difference in bullet brand as long as profile was the same. 150gr flat base Privi Partizan worked as good as 150gr flat base Lapua. jwr