03-13-2014, 02:55 AM
There is data for TAC and 8208XBR for the 129gr Interlock in Hornady's 9th Edition:
8208XBR-2.245" COL (work COL out in your chamber) 22.4gr was their start load, and max was 26.2gr work up in .2gr-.3gr increments, no more. XBR is known to spike viciously with 123gr, so don't go near the max load and just load from there, especially with a longer bearing surface flat-based bullet.
TAC-23.6gr start load, max load 27.3gr
Those both maxed out at 2300fps from an 18" barrel for Hornady's testing.
8208XBR-2.245" COL (work COL out in your chamber) 22.4gr was their start load, and max was 26.2gr work up in .2gr-.3gr increments, no more. XBR is known to spike viciously with 123gr, so don't go near the max load and just load from there, especially with a longer bearing surface flat-based bullet.
TAC-23.6gr start load, max load 27.3gr
Those both maxed out at 2300fps from an 18" barrel for Hornady's testing.