Thread: Same load increased velocity 🤔

Hey all,

Been reloading for years now, and this is the first time I've come across this and can't find anything online to explain it.

Rifle is a howa 6.5creedmoor 24" with about 300 rounds through it.
I've settled on 143 eldx, 41.5gr of adi 2209, cci no.200 primers and hornady brass.

Velocity was 2704fps, but all of a sudden its had increased to 2855fps. Nothing has changed in the load. I use a rcbs lite and check on the little hornady scale every few rounds. I've even pulled bullets and checked the powder load 41.5gr. Still the same bottle of adi 2209.

What can cause this jump?