Lilja Group Buy Barrel Accuracy

[calshipbuilder]

Just completed a ladder test with the lilja (20" 740 profile) barrel build. Hope this helps someone else working with their new barrel.

Switched scopes to a 10-50x60 Sightron, testing done at 200 yards.

Disclaimer: This post contains load data that is over maximum book loads, I take no responsibility for your use of this data, USE AT YOUR OWN RISK!!!!!

Load Details:

AA Brass, CCI BR4 Primer, 8208 XBR, 107gr SMK, 2.260 OAL

Test Setup:

Loaded 28 rounds, Started from a cold clean bore. 6 sighters at 29.8gr, and 22 rounds for the ladder. Went from 28.6gr to 30.6gr in .2gr increments, 2 rounds per charge weight. ~ 45 seconds between shots. Collected Velocity and POI for each of the 22 rounds in the test and velocity for the Sighters. Shooting Chrony set up at 10 yards.

Observations:

[ATTACH=CONFIG]4650[/ATTACH]
[ATTACH=CONFIG]4652[/ATTACH]

Normally, loads will climb as charge increases, however, this did not happen during this test, the hottest loads were clustered lower, with the exception of #22.

Looking at the clusters, rounds 2,3, and 4 shot into a tight group less than 1/2 moa. I undercharged the first round, as shown by the velocity. SD also looks good for those three shots. However, 28.7gr (2546 FPS) isn't exactly maximizing the capability of the cartridge.

rounds 5-13 created a shotgun pattern

edit: Just saw another node at shots 9-12 (~29.5gr) but SD is poor (19 fps)

15 through 20 grouped up, with 14 sneaking in there close as well. Shots 15-20 fell into ~1.3 inches (sub 3/4 MOA@200), showing a node at 30.2gr (2673 FPS). SD for those 6 rounds was also good, at 12 FPS.

21 and 22 patterned outside the group.

Next steps:
Load 10 at 30.2gr and 10 at 30.3gr, shoot for groups, then mess will seating depth if necessary.