I have had better spreads & SDs with the Palma brass compared to the standard shooting 155s with a local powder not that much faster than 8208 (AR 2206). Most who use Varget or similar tend to prefer the large primers, unless their goal is to squeeze the last fps out of the case, in which instance, the small primer case is likely to take more pressure. likewise, when it gets to the heaviest possible projectile weights, the little primer has that pressure edge.