I did. It makes quite a difference. I also changed temp and humidity. All these variables are interesting cause depending on the year, I could be hunting in 25C or -30C and the humidity varies from 98% down to 70%. My bullets go from being good to being marginal depending on temp and humidity. It seems the baro is more of a constant between 100 and 103kPa. I think my next barrel will be a faster twist.