[Trikstr]

SSK upper w/16.25" 1:8 twist Shilen bbl. SSK reflex style suppressor.
Up until today I have been using Rem. 7 1/2 primers exclusively. Best groups have been around and inch. Had a load today that will be retested soon.
200 grn Sierra MK
8.6 grn N110
CCI 400
OAL 2.200"
reformed 221 brass
1-1070 fps
2-1027 fps
3-1029 fps
4-1025 fps
5-1020 fps
Es-50
Avg-1034
Sd-20
If the 1st shot is edited from above the results are
Es-9
Avg-1025
Sd-4
1st shot of the string velocity is always high and consequently land higher(2.1") in this case for a group 2.335" c2c.
Shots 2,3,4 were in one hole(.127"c2c),5th touching 2,3,4 low(.334" c2c)
Fired next test load fairly close together. Same load above except WSR primer. OA group was 1.42" c2c.
Next load was
208 grn A-max
8.6 grn N110
CCI400
OAL 2.210"
+1074 fps
-1049 fps
Es-25
Avg-1062
Sd-9
Fairly round group .932" c2c
Last load same as above except WSR primer.
+1084
-1075
Es-9
Avg-1079
Sd-3
Group size 3" c2c
Appearantly my gun prefers the CCI 400 primer(over 20yrs old).
Don't be afraid to try different component combinations. I also have some Fed 205M I had better try.