Author Topic: Bull Pups  (Read 1146 times)

Alan

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Bull Pups
« on: March 05, 2016, 05:54:21 PM »
One of the supposed advantages of a Bull Pup (the term Bull Pup dates back about 1900), is the rifle is short in length, but the barrel is as long, or longer, than a standard rifle. But I question this.

Depending on the propulsion used (air, spring, power, nitrogen piston, etc.), the caliber and weight of the projectile, there is a specific length where additional length has a negative effect. I bring this up, because I recent saw a Crosman pump pistol with a 27 inch barrel. I suspect 18 inches is about optimal.

So what gives???


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Alan

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Motorhead

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Re: Bull Pups
« Reply #1 on: March 05, 2016, 08:55:03 PM »
Bullpup is ONLY an action platform .... actual mechanics follows no special rules or changes in the established standard.
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rsterne

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Re: Bull Pups
« Reply #2 on: March 05, 2016, 09:11:00 PM »
Barrel length, in most cases, adds velocity, for CO2, PCPs and Pumpers, but not for Springers.... The trade off is when the air has expanded so much that the force on the pellet is less than the bore drag of the pellet, in which case it starts to slow down again.... The more power the gun has, the longer the barrel will be before this occurs.... Big Bore PCPs are still gaining significantly with barrels over 36" in length, as an example....

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