Subscribed to the Sierra app so I could look at the .223rem data for the 60gr Sierra Tipped Matchking. The load data for the 60gr TMK and AR COMP is odd. It doesnt fall into line with anything else as far as charge weights or velocities. With AR Comp/60TMK it lists 21.4 gr max charge but 22.4 gr on the 69gr TMK. 21.5gr for 77 TMK. Alliant website lists 23.2 for the 69 SMK.
Alliant list 25.6 gr AR comp for a 55gr sierra HPBT. Yet Sierra says 21.4 for the 60 TMK.
Looking at other listed powders things appear to be normal and perfectly aligned with bullet weights higher and lower than 60. Seems their AR Comp data for this bullet is strangely low. At least 10% lower than I would expect for starting and max charges.
Anyone here familiar with this bullet or combination? Thx
Alliant list 25.6 gr AR comp for a 55gr sierra HPBT. Yet Sierra says 21.4 for the 60 TMK.
Looking at other listed powders things appear to be normal and perfectly aligned with bullet weights higher and lower than 60. Seems their AR Comp data for this bullet is strangely low. At least 10% lower than I would expect for starting and max charges.
Anyone here familiar with this bullet or combination? Thx
