I did finally get around to trying several combinations of new Lapua brass, once fired and Hornady. Preliminary results below.
I hope this might save someone a few trips back and forth to the range. Tikka CTR action and barrel in KRG Bravo stock.
144 grain Berger, Once-fired Lapua SRP brass, CCI 450 magnum primer, RL-16 powder. 55 degrees F.
2.915 OCL. Consistent OCL with 0nce-fired brass and Area 51 drop tube. (0.291 neck bushing).
42.0 grains.
2,754 fps fouled barrel, (2.832 OCL), 2,737 fps (12 oclock POI).
2,737 fps.
42.2 grains.
2,747 fps. (One o’clock POI).
2,760 fps.
*42.4 grains.
2,772 fps.
2,774 fps.
42.6 grains. (Centered < ¾ inch).
2,778 fps.
2788 fps.
42.8 grains. (Stiff to load both).
2,800 fps.
2,785 fps. (Slight ejection mark).
*Re-test 42.4 and 42.6 with five shot group.
144 grain Berger and Winchester Staball 6.5 powder, Once-fired Lapua Brass, CCI 450, 2.915 OCL.
42.0 grains.
2,698 fps.
42.5 grains.
2,645 fps.
43.0 grains. (Mild load, lots of room left in case).
2,659 fps.
*Try 43.5 and 44.0 grains Staball.
140 grain Hornady ELD, 4th fired Hornady brass, 0.290 neck bushing, 2.893 OCL, Federal 210 M primer. Winchester Staball 6.5 powder. (Use for mass produced position shooting ammo). RCBS powder measure.
43.0 grains. (2.889 OCL). 12 o’clock high.
2,675 fps (- 44 fps less than Lapua).
43.5 grains. (2.884 OCL).
2,698 fps.
44.0 grains. (2.893 OCL).
2,740 fps
44.2 grains. (2.890 OCL). Higher, Left POI.
2,764 fps.
*44.4 grains. (In group, primer fairly flat. Probably max).
2,786 fps.
140 grain Hornady ELD. Lapua new brass. 42.3 - 42.4 grains RL-16. CCI 450, 2.902-2.907 OCL. RCBS powder measure. 4.5/25 on micrometer powder adjustment.
2814, 2,819, 2,830, 2,807 fps.
2819, 2790, 2822, 2839, (2817 average).