Former 20 Short COAL was 2.500",which will work for some folks in 223,even in Wylde. Given the advent in projectiles,I want a shorter case,which allows greater projectile length and that negates same from the race. Hint.
Going Grendel or BR,simply kicks windows of opportunity open and that COAL will happily feed them all. BR here,with .224" Beer Can and .243" Sugar 110 SMK,if only for conversation,at said COAL. Hint.
Keeping ogives at neck/shoulder juncture,paints a rather purty picture(assuming throat geometry is sound) and a 7BR would be Skookum. Hint.
Just sayin'.................