Rifle:
Savage 110 Long Action
Criterion 26" .260 Rem 8 twist SS varmint contour barrel
Savage 112 BVSS centerfeed stock, converted to staggerfeed
Nikon Monarch 5-20x44

Environmentals:
Partly cloudy
Temp 85°F, Dewpoint 53°F, ~32% humidity
675' ASL elevation, density altitude ~2400'
Partially shaded (tree) shooting bench
Rifle shot off bags
100 yards

Load specifics:
2x Nosler brass, neck sized with Lee Collet Die
WLR primer
Hornady 6.5mm 123gr A-Max
COAL 2.84, 0.010" off lands

Notes: I really need to bed my action/stock and don't have any velocities for these loads...my ProChrono & Miles Gilbert Bedrock kit are supposed to arrive tomorrow but I'm out of town on business so today was my range day. The bench also wasn't the most conducive to great accuracy, especially given my marginal but improving form.

Varget
38.5: 3 shots, 0.5" group. Two shots touching, one pulled high/left
39.0: 3 shots, .425" group. Two shots in one hole, one pulled high/right
39.5: 3 shots. 2 shots touching, one called flyer 1.5" high
40.0: 3 shots, 0.64" group, horizontal stringing. Showed pressure with Sticky bolt & brass flow

H380
42.0
42.5
43.0
43.5

All groups were garbage with sticky bolts, which was disappointing considering 41.5gr H380 with a 120 Nosler BT is my whitetail load and shoots very well out of this barrel, as well as my 22" 9 twist Remmy 700 Mountain LSS. Did not try the 43.5gr load due to sticking bolt @ 43.0gr.

RL17
44.0: 3 shots, 0.7" group. First two shots touching, third pulled .6 right
44.5: 3 shots, 0.61" group. First two shots touching, third called flyer .6 low/right
45.0: 3 shots, 0.46" group.

H4831SC
47.0: 3 shots, 1"+ group
47.5: 3 shots, 0.63" group. First two touching, third called flyer left
48.0: 3 shots. First two shots one ragged hole, got excited and pulled the third 1.25" up/right in a called flyer. This load looks to be VERY promising.
48.5: 3 shots, 2" group with vertical stringing
49.0: 3 shots, 0.5" group, ejector marks.
49.5: did not test due to pressure @ 49.0

My next test will further explore 48.0gr H4831SC +/- 0.5gr, RL-17 44.5 +/- 0.5gr, and Varget 39.0 +/- 0.5gr, thankfully with velocity data!