Wilson Combat 20" Super Sniper WYLDE 1:8 Barrel, pics below
Did 3 shot groups X2 so 6 bullets total for each powder combination. See Excel Grid below.
Of note, this is the first ever test of these bullets, so these powder combinations are just what "generally" are good, but not tuned for this bullet OR barrel. So it can only get better from this.
When you test bullets with 8 different powders, on the same day, like we do commonly, you can quickly see what powders are consistently good. And you can also understand why people are adament about what they use for their 600 yard matches. For example. Look at Accurate 2520. Thats super high velocity, low SD, and 2nd most accurate overall. Its top 2 here, period. Its a ball powder. The ONLY ball powder here. You can also see here that N135 is very similar in performance to Benchmark. Reloader 15 is good, good result as well.