In my 5 20 tac barrels and one 204 ruger barrel AA2520 was the best in all barrels except one barrel that liked 8202 better. The BK 39 grainers would shoot in the high zeros 5 shots at 100 yards. One barrel liked the 40 grain Bergers. 3800fps in the 20tacs and 3900fps in the 204. One Lilja and the rest Benchmark barrels.I experimented with 8208 a lot but best accuracy came with LT-32 with all bullets tried in my .20 Practical - mostly use 32 and 40 V-Max, as well as 39 Blitz Kings, H4198 and H322 did better for me as well.