257 ACKLEY IMPROVED
The following data was developed in a Ruger 77 rifle. It originally had a 243 barrel that was thoroughly shot out. We put a Shilen stainless steel # 4 barrel on it, finished at 24 1/5 inches.
We glass bedded the action in the original factory stock, and free floated the barrel. A Leupold 6.5 – 20 X scope was installed in Ruger mounts.
Remington 257 Roberts brass was used together with the Federal 210M primers. All bullets were molly coated, and all groups were 3 shots at 100 yards.
|
POWDER |
VELOCITY |
GROUP |
BULLET |
|
16.0 GREEN DOT |
NC – FIRE FORM |
0.176 |
SPEER 100 HP |
|
48.0 W 760 |
3064 |
0.668 |
NOSLER 85 BALLISTIC TIP |
|
49.0 |
3116 |
0.801 |
|
|
50.0 |
3186 |
0.625 |
|
|
51.0 |
3246 |
0.903 |
|
|
52.0 |
3362 |
1.021 |
|
|
53.0 |
3394 |
0.537 |
|
|
54.0 |
3473 |
0.657 |
|
|
51.0 RELOADER 19 |
3008 |
0.426 |
|
|
52.0 |
3128 |
0.716 |
|
|
53.0 |
3228 |
0.298 |
|
|
54.0 |
3278 |
0.886 |
|
|
55.0 |
3394 |
1.160 |
|
|
56.0 |
3432 |
0.435 |
|
|
57.0 |
3509 |
0.239 |
|
|
58.0 |
3545 |
0.603 |
|
|
44.0 VVN 150 |
3085 |
0.456 |
HORNADY 75 V-MAX |
|
45.0 |
3163 |
0.476 |
|
|
46.0 |
3233 |
0.627 |
|
|
47.0 |
3292 |
0.851 |
|
|
48.0 |
3400 |
1.045 |
|
|
49.0 |
3478 |
0.848 |
|
|
50.0 |
3548 |
0.331 |
|
|
51.0 |
3615 |
0.796 |
|
|
52.0 |
3676 |
0.453 |
|
|
50.0 VVN 165 |
2865 |
0.295 |
NOSLER 100 BALLISTIC TIP |
|
51.0 |
2920 |
0.649 |
|
|
52.0 |
2962 |
0.818 |
|
|
53.0 |
3016 |
1.491 |
|
|
54.0 |
3115 |
1.139 |
|
|
55.0 |
3169 |
0.784 |
|
|
49.0 H 4831 |
2741 |
0.856 |
|
|
50.0 |
2800 |
0.603 |
|
|
51.0 |
2916 |
0.485 |
|
|
52.0 |
3010 |
0.624 |
|
|
53.0 |
3089 |
0.437 |
|
|
54.0 |
3117 |
0.448 |
|
|
55.0 |
3174 |
0.160 |
|
|
48.0 H 4831 |
2799 |
0.489 |
SPEER 120 SP |
|
49.0 |
2884 |
0.744 |
|
|
50.0 |
2903 |
0.360 |
|
|
51.0 |
2949 |
1.478 |
|
|
52.0 |
3029 |
0.960 |
|
|
|
|||
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Last updated 5 May 1999