Changes to a worked-up load

[DenverGP]

Whats everyone's take on making changes to load that you worked up?

If I change primers (while still staying the same type, not switching from regular to magnum, etc)?

If I change bullet brands while still maintaining the same type/weight?

How about when getting in a new batch of powder?

None of my current loads are close to any max, and they are just plinking rounds, so a little accuracy change isn't an issue. I think on the powder batches, I don't see a need. For the bullets, I have made a slight adjustment to OAL 1.125 down to 1.120 to make up for new bullets being slightly shorter than the old bullets, and I did make a small batch of those to test before mass loading, but didn't do a new workup.

I'm thinking if I changed primers, a new workup would be in order since I've heard there can be a pretty good bit of variation between brands.

[20X11]

Primers will make small differences. Bullet brand change is a problem, the bearing surface of the projectile can make huge differences(rework the load). Powder can vary as much as 15% lot to lot (except for some modern powders like 300-MP which was designed with lot to lot consistency in mind)and you should rework the load.

[Great-Kazoo]

I'd see what the performance is before making any changes. There's been little if any change with the pistol & rifle loads (223) i'm running when going from CCI - winchester. The only time i noticed a difference (pistol) was when i changed to a threaded bbl. Keep in mind i'm not target shooting be it pistol or high power.

[Zombie Steve]

If you're just switching primers like you say, and you aren't pushing the top end, you probably won't see much difference. If you're changing 3 things at once, it's worth re-working the load... especially different bullets as 20X11 said.