My experience: BSF Barrels May Experience Substantial Thermal Drift.

[StoneHendge]

Here's another set. After zeroing with the temporary handguard, I neglected to see the wind was blowing in 2 directions and missed the first 2 shots on a 4" diamond at 250. The next 3 were hits. It takes some time in between shots to wait for the target to stop swinging. I then went to my software and changed to the 6" diamond at 460. Went 4 of 5. Again, some time in between shots to let it stop swinging. I stopped, loaded up the 10 round mag and went back to the 460. Low and left. Adjusted and kept on going low and left after further adjustment. After 6 misses, I went to paper at 100. The zero is good since I was going off the bag:

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