Ok, I've got a BIG problem. I've got a 10 FCP-SR 24". I loaded 175 grain Sierra Matchkings to Hodgdon's accuracy load for Varget, 44.7 grains for 2680. I never chronographed them, but it was right on the money when using the Vortex Ballistic calculator. I've since added a brake from Southern Precision Tooling, and while they observed a 20fps gain in velocity in their 10" Mini 16, I was not expecting my secondary results. Same load, same OAL, same lot of powder/bullets/primers/cases. It was all the same. Shot both loads within 15 minutes of each other allowing for a cool down. Result? The exact same load grouped was reduced by 25%, but was 4" high. I knew I would gain velocity, but I never expected that. Can anyone give me an idea of how fast I'm now pushing these pills? I don't have access to a chrony and don't have money in the budget for one.

Sent from my SM-G950U using Tapatalk