As the title says, I did an initial tune on my rifle and tested some slugs.
(500mm barrel, Donnyfl Tatsu, Accu-tac pc-4, Vortex Diamondback tactical 6-24x50 W/EBR-2C reticle )
I set the reg to 150bar and adjusted the hammer spring to fully utilize the pressure. and started with the NSA 17.5gr .2165, .217, and .2175. Velocity was 998 FPS, with the .2175 holding the tightest group, which was clover leafed at 12 yards. I think these might benefit from a reduction in velocity to about 950FPS.
(The groups with the flyers had a noticeably more difficult seating of the slug for the shots that went right. I think they may have gone in with the nose angled)
I will soon have all the different diameters from .2165-.218 for the 20.2gr. However, I did have the FX hybrid 22gr on hand.
Results from the 22 hybrids. (10 shot group)
Velocity/ HI 903/ Low 898/ Avg 900/ Muzzle energy 39.6 ft-lbs.
Definitely shows promise. I don't really want the overall length of the 700mm barrel, but I am considering moving up to the 600mm one.
I will update with 20.2 and others as I try various slugs from a few other manufacturers as well. And once I have some good candidates for accuracy, I will test at 50 yards.
(500mm barrel, Donnyfl Tatsu, Accu-tac pc-4, Vortex Diamondback tactical 6-24x50 W/EBR-2C reticle )
I set the reg to 150bar and adjusted the hammer spring to fully utilize the pressure. and started with the NSA 17.5gr .2165, .217, and .2175. Velocity was 998 FPS, with the .2175 holding the tightest group, which was clover leafed at 12 yards. I think these might benefit from a reduction in velocity to about 950FPS.
(The groups with the flyers had a noticeably more difficult seating of the slug for the shots that went right. I think they may have gone in with the nose angled)
I will soon have all the different diameters from .2165-.218 for the 20.2gr. However, I did have the FX hybrid 22gr on hand.
Results from the 22 hybrids. (10 shot group)
Velocity/ HI 903/ Low 898/ Avg 900/ Muzzle energy 39.6 ft-lbs.
Definitely shows promise. I don't really want the overall length of the 700mm barrel, but I am considering moving up to the 600mm one.
I will update with 20.2 and others as I try various slugs from a few other manufacturers as well. And once I have some good candidates for accuracy, I will test at 50 yards.