sierra 77 gr in 223 with 7 twist

[Robinhood]

Sierras accuracy load is RE-15 24.1 grs. @2750 fps/1293 ft.lbs.
They used Rem 7 1/2 primers. I drop a few tenths of a grain with CCI.

What powder scale?

Make and condition of brass?

[noname]

Sierras accuracy load is RE-15 24.1 grs. @2750 fps/1293 ft.lbs.
They used Rem 7 1/2 primers. I drop a few tenths of a grain with CCI.

What powder scale?

Make and condition of brass?

Either RCBS electric or Redding balance beam and they both weigh to same each time.Brass is Winchester,Once fired..