Dave338
Under performing
Saturday, August 09, 2025, 17:53

Im looking for some help. I have a couple contenders that I've had for years, I just recently pick up a chronograph and the velocities are significantly less the what the reloading book says they should be. I have a 30 gnr that I'm loading 36 gr of imr 4895 behind a 125 grain hornady sst, while there isn't a listed velocity for this, a similar load behind a 135 grain bullet calls for 2690 fps. Im getting around 2000fps. The other load I'm using is for my 338 gnr, im using 53.5 gr of h 4350 behind a 200 grain hornady sst, the book calls for 2625 fps, and again I'm just over 2000. I undersrltand there are variables that might have a 100-200 fps difference, but 500-600 seems a little high. Any ideas or suggestions are appreciated to get the velocities closer to the 2500 fps. Thanks