Thread: Let's talk about velocity Extreme Spread (ES)

Originally Posted by T.FOYE

a lot of that variation could be due to the cadence of shots fired and the barrel temperature.
I faff incessantly with my neck tension, depth, annealing, weighing charges to .02gn etc etc.

If i get trigger happy and shoot too quick my ES becomes rather embarrassing even with a match grade thick barrel.

Shoot the strings real slowly i say.

I haven't seen any evidence that barrel heat causes any decrease in velocity consistency.


If there were an effect, you'd expect that the 5rd SD measured after 0-5 rounds would be consistently and measurably lower than the 5rd SD measured after rounds 6-10 from a continuous 10 round string.


Here's a quick paired bar chart of that from 11x 10 shot strings - there's no clear trend at all.






I now shoot 10 round strings for everything with no consideration for barrel heat. With good components etc I still get good SDs.