N135 will get you some very, very tiny groups with 55g at 3700 fps(This barrel is a 26" , 23" Hart 14 Twist),
You will NOT believe just how accurate this powder is with the 55's and FAST!!! I have used 7 1/2, also CCI BR-4's with this powder with good success and N133 also, but N133 works better with the 40-53g bullets.
98* on this day, and windy, CCI 450 primer, IMI brass, bullet seated to touch the lands
After shooting these groups, I put up 20 of the MINI clay pigeons that measure 2 3/4" in dia at 400 yards, I let my buddy shoot them. He did not miss one, then went back and shot the pieces that were left. N133 with a 50g Nosler and N135 with a 55 turns this case into a benchrest rifle. I was using an old B&L 12-32x on the rifle that day that has a very fine cross hair.
Take notice of how the point of impact is shifting on the target due to wind direction, thank goodness for a wind flags, one at 25 yards and the other at 80 yards.
I also shot very small groups with benchmark, but it is at least 100 fps slower than N133 with the 50's and slower than that with the 55g with N135. H335 is great and fast, not quite as accurate as the N powders by about .050. Old AA2015 is unreal accurate with both the 50g and 55g and FAST. XMR 2015 is the same as benchmark. Win 748 is also very accurate but slower than Benchmark with 50 and 55g.
H335 will give the longest barrel life that I have seen and the N powders give the shortest barrel life as they have 20% DNT in them. The 40g NOsler with the old 2015 will give super accuracy right at 4200 fps, and N133 will be over 4100 with extreme accuracy. I do believe that the N130 with the 40g bullet would be fantastic, also.
The 223 AI will show you in a hurry if you need to have your firing pin hole bushed in your bolt from cratered primers, and if you pop a primer, it can break a 2 oz trigger, I broke two 2 oz triggers over the years in 6 BR's from over size firing pin holes in the bolt.
