FL resize or Neck Size?

[Bill Steele]

To avoid a new thread.. does anyone know if switching primers matter in working up a load?

Sierra lists they use federal primers for 165 SBT bullets, but I only have CCI. Does this mean the amount of powder needs to be altered?

Like everything on these threads, the accurate answer is it depends on a lot of variables all tied inexorably to your expectations.

If you are talking about not blowing something up, changing primers is fine.

On the other hand, if you have a load that is working really well in your gun (say anything below .5 MOA for arguments sake), changing primers can screw with those results.

There will be someone along very soon to tell you definitively why the above happens.... just ignore them.

[sixoclockhold]

FL every time

[JagerDog]

To avoid a new thread.. does anyone know if switching primers matter in working up a load?

Sierra lists they use federal primers for 165 SBT bullets, but I only have CCI. Does this mean the amount of powder needs to be altered?

If you're working up...it does not matter. If you have an established load somewhere near max, it might.

[Divernhunter]

Just FL resize. You can make super accurate ammo without neck sizing. I, especially, would not neck size hunting ammo. It must be reliabable. I even use new brass for my big game hunting ammo.
Switching primers will be fine. I have done it for many years with no problems. The only primer I would back off loads with to start is the Fed 215Mag as it is the hotest primer and was developed for the Weatherby cartridges originally. I like using it in all my mag rounds and some other.