So I spent the majority of my day doing load development on my rifle and am looking for advice or thoughts.

Rifle is a seekings ph2. Here are my results. I can't figure out the velocity spike from 59.8 to 60 grains. All bullets seated .015" off the lands

59 grains

Avg 2950

Es 14

Sd 7.4

1.093" group

59.5 grains

Avg 2962

Es 24

Sd 12

.984" group

60 grains

Avg 3061

Es 12

Sd 6.1

1.473" group

60.2 grains

Avg 3080

Es 14

Sd 9.4

.667" group

59.8 grains

Avg 2943

Es 4

Sd 2

.748" group

Rifle is a seekings ph2. Here are my results. I can't figure out the velocity spike from 59.8 to 60 grains. All bullets seated .015" off the lands

59 grains

Avg 2950

Es 14

Sd 7.4

1.093" group

59.5 grains

Avg 2962

Es 24

Sd 12

.984" group

60 grains

Avg 3061

Es 12

Sd 6.1

1.473" group

60.2 grains

Avg 3080

Es 14

Sd 9.4

.667" group

59.8 grains

Avg 2943

Es 4

Sd 2

.748" group