I use the redding S type bushing dies with a SAAMI spec chamber. Seems to be working out OK so far. Here are some of my initial loads and corresponding target from last weekend.
Trued Rem 700 in .260 AI with 29" 1:8 twist Gailard barrel
Lapua .243 brass once fired not touched other than uniformed primer pockets
CCI BR2 primers
COL is 2.875"
#s 1-4 are H4831sc (47.5-49gr) with 130gr Berger hunting VLD
#s 4-8 are H4831sc (47-48.5gr) with 140gr Berger hunting VLD
Weather was -13 deg C mainly calm @ 3400ft ASL.