26.5 grains of Vit 133 'JUST' fits into a Lapua .223 case. It gives 1/2 MOA groups at 3800 fps with a 40grain V-max, through a 1 in 12" twist, fluted heavy stainless steel barrel.
I cannot get the same accuracy with Vit 133 under a 55 grain soft point Sierra slug.
Robin