I’ve noticed several recent bottle-conditioned Belgian ales and Saisons I’ve bought have nearly zero headspace below the cap. Is this to increase volume of dissolved CO2, a method to reduce oxidation for long term storage or both? I’ve only seen this on cap-style bombers, not on corks. Also, does anyone have a good source for normal cap size bombers that are thick enough to handle > 3.0 volumes of CO2 for such beers? I reuse many thicker glass bombers but they often have a bulge below the lip that makes capping difficult.