what`s the bull barrel good for ?

Smitty said:
Extra weight on the bbl so then when the gun is fired there is less front blade jump & less kick in the gun with a bull bbl.

Also, the barrel won't heat up as quickly when firing for adjustment purposes (rifle). On a .22 rimfire target pistol it's mostly for looks, balance and accuracy over prolonged shooting sessions (Like in ISU or NRA style matches)
 
The heavy bull barrels also eliminate the necessity for a barrel bushing. Stiffer bbls, often yield more accuracy. They also take much longer to heat up.
 
On handguns with short (2"-to-8") barrels, a heavy barrel is really only about weight and balance. The difference in stiffness of a 6" barrel even between a light weight and a full PPC 1.25" bull is so tiny as to be meaningless.

The elimination of a barrel bushing in a 1911 type hangun can be an accuracy improvement; but a bull barrel isn't the only way to do that.
 
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