Eli5: Why do older guns and cannons typically have a slightly wider “muzzle face”?

295 viewsEngineeringOther

If you look at most pre smokeless guns and cannons, you can often see them having a design that makes sense when it comes to their overall thickness. They are typically wider (often having “hoops”) closer to the breach area for obvious reasons as it’s where the explosion happened. But what I don’t understand is why they often had a slightly flared out bit at the extreme end of the barrel often called “muzzle face”, as often they would try to avoid putting a lot of weight on the extreme end as it would make it harder to move (aiming wise).

In: Engineering