Thread: A question for the sharp shooters..

Hey fellas,

I’m battling my way through a load development for a new 300 prc.
I’ve stumbled on to a load that has good speed and SD of around 6fps over 15 shots over a garmin chrono.
I’ve fired 3 five shot groups with this load, and all three have been exactly the same - horizontal dispersion of less than 10mm but vertically stringing about 2-4 inches across each group. If I overlayed the targets they would all be in the vertical line but a 4 inch string.
The fact there is a good SD and horizontal spread is so good makes me want to persist, so is there anything I can do to shrink the vertical string? Could it be something with the load (seating depth etc) or rifle (action screws etc). Or do I give up and carry on in another direction?

The rifle is braked with one of Greg’s terminator brakes so I’m not going to be able to reduce muzzle jump more than that. Also only about 30 rounds down a new barrel.

Any advice would be great!