This rifle does not have the M-4 style feed ramps, so the 90 grain Sierras are hanging up.

6.8x43mm Range Report 90 Grain Sierra Hollow Point
Conditions:
Rifle: Stag 16 inch flat-top, 1 in 10 twist SPCII chamber, A2 buttstock with Tubbs flat spring
Sights: Fixed 6 power Leupold. FXIII 42mm Heavy Duplex
Range 100 yards
Temp: NEG 08 degrees F , Negative 22 C, Light wind
Light: Flat fading light on snow.


1.
Bullet: 90 grain Sierra Hollow Point, flat base
Powder: 30.1 grains, H-322.
Primer: CCI-BR-4 bench rest small rifle, hand seated
Brass: SSA
COL: 2.245 inch Lee Crimp.
Velocity average: 2,705 fps 40 fps ES

1.5 inch group with last shot flyer to 2 Does not load well No pressure signs


2:
Bullet: 90 grain Sierra Hollow Point, flat base
Powder: 33.5 grains, AA-2230
Primer: CCI-BR-4 bench rest small rifle, hand seated
Brass: SSA
COL: 2.245 inch Lee Crimp.
Velocity average: 2,647 fps 43 fps ES

0.5 inch group with last shot flyer to 0.75 Does not load well No pressure signs


3:
Bullet: 90 grain Sierra Hollow Point, flat base
Powder: 27.5 grains, RL-7
Primer: CCI-BR-4 bench rest small rifle, hand seated
Brass: SSA
COL: 2.245 inch Lee Crimp.
Velocity average: 2,664 fps 47 fps ES

1.25 inch group Does not load well Some pressure signs

4:
Bullet: 90 grain Sierra Hollow Point, flat base
Powder: 27.0 grains AA 1680
Primer: CCI-BR-4 bench rest small rifle, hand seated
Brass: SSA
COL: 2.245 inch Lee Crimp.
Velocity average: 2,645 fps 74 fps ES

1.0 inch group Does not load well NO pressure signs

5:
Bullet: 90 grain Sierra Hollow Point, flat base
Powder: 28.5 grains H-4198
Primer: CCI-BR-4 bench rest small rifle, hand seated
Brass: SSA
COL: 2.245 inch Lee Crimp.
Velocity average:
2,883 fps 24 fps ES
1.0 inch group including flyers Does not load well HIGH pressure signs
Has potential for accuracy if it would load without hanging up.