Originally Posted By: GregWI only ask I got this from Johan, their load guy. I didn't try TAC based on his recommendations below and potential velocities and compression issues. I love TAC however...
Greg,
TAC will be too slow burning requiring even more compression than the faster X-Terminator below.
You can load to the same loads as for X-terminator but the velocities will be 5 to 7% lower.
Caliber: 6mm x 45 (6mm-223Rem)
Barrel length: 20”
For 16” barrel reduce velocity by 5% to 6% (ca 120 -150 Fps).
For 24” barrel increase velocity 3% to 4% (ca 90 -110 Fps)
Powder: Ramshot --- X-Terminator.
Bullet weight: 60 grains.
Start load: 26.1 grains (2800 – 2900 ft/p/sec)
Maximum load: 29.0 grains (3075 – 3175 Ft/p/sec). Full case/compressed.
Bullet weight: 70 grains.
Start load: 25.3 grains (2650 – 2750 ft/p/sec)
Maximum load: 28.0 grains (2900 – 3000 Ft/p/sec). Full case/compressed.
Bullet weight: 75-80 grains.
Start load: 24.3 grains (2550 – 2650 ft/p/sec)
Maximum load: 27.0 grains (2850 – 2950 Ft/p/sec). Full case/compressed.
Bullet weight: 85 grains.
Start load: 23.4 grains (2500 – 2600 ft/p/sec)
Maximum load: 26.0 grains (2700 – 2800 Ft/p/sec). Full case/compressed.
Greg,
I'm a little confused. Thier load guy was saying that max loads w/ Xterm would be compressed and moreso w/ TAC? 25.5 gr of Tac in the 223 case is about 75% full. I simply used their data for the .223 service rifle (68gr bullet). ALL their data for service rifle (24" 1:7 & 1:9) are w/ TAC powder starting w/ a 68gr bullet. I certainly shoots well in my rifle and showed no signs of pressure. And this was using older load data. The most recent data shows 24.1gr max load for 68gr w/ TAC. Something's not adding up here. Is it safe to assume that whether you're pushing a 65gr .224 bullet or a 65gr .243 bullet from the exact same cartridge, the min and max loads should be the same?