For the metrically inclined:
40 inches = 1.016 meters
25 yards = 22.85 meters
40 yards = 36.576 meters
1 inches = 0.0254 meters or 2.54 centimeters
1 yard = 0.9144 meters
This is a community dedicated to discussion around historical arms, mechanically unique arms, and Ian McCollum's Forgotten Weapons content. Posts requesting an identification of a particular gun (or other arm) are welcome.
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Yes they get a bit smaller at the end to reduce the spread.
Bullets are quite malleable and it’s normal for them to deform a bit during firing. Bullets for non-shotguns typically get forced down a bit in the forcing cone before being deformed to fit the grooves in the rifling.
“Rifled” lead shotgun slugs have these grooves around the outside that allow them to deform down to a smaller diameter. You can shoot them through a choked shotgun barrel just fine.