I think it's common to be able to do more on barbell than on two dumbells combined. Your grip on the bar prevents your hands from spreading apart as you press up. There's some amount of tension in the bar that balances the force trying to spread your arms apart butterfly style. With barbells, nothing counteracts that "arm spreading" force except your own muscle.
Having said that - I love dumbell presses. Seems to work the pecs a lot more - for exactly this ^ reason.




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