Going through my many bullet moulds in preparation for casting over winter. I have almost 120 moulds, but somehow very few that have given consistant accuracy over many years. Many of the molds that I have are discontinued and thus not available to today's caster.
The best designs feature a bore riding nose with the bullet seated to just touch the lands. Lymans 311284 a 210gn style with a large bore riding nose has achieved the smallest 10 shot group ever! The same manufacturer scaled down the same style to suit the 270cal (280432) and again the bore riding nose align the bullet in the bore ready for firing.
Lyman's 30 cal 311284 Lyman design for the 270Cal