Reply To: Barrel length vs accuracy

Forums General Discussion Barrel length vs accuracy Reply To: Barrel length vs accuracy

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weatherby
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“Marksman3006”Longer barrel means more velocity…..not more accuracy. However, with velocity comes increased accuracy at longer ranges. This is a general rule of thumb. If the barrel is too long it can actually slow the projectile down…..but this is rare and shouldnt concern you. It really comes down to velocity. A short barrel shooting the same velocity as a longer barrel does have a disadvantage still……the escaping gas behind the pellet is at a much higher pressure and therefore there is more turbulance on the skirt of the pellet as it leaves the crown.
My advice……if shooting long range stick with a proven long range platform. If shooting shorter ranges you will probably never tell the difference.

Unfortunately, I can’t agree with everything you say.
A long barrel can indeed slow a pellet down, but this counts mostly for springers.
Pcp’s in general will generate more speed with a longer barrel, at least, with the barrel lenghts found on “regular pcp’s”
A shorter barrel is also more rigid than a long one, if the diameters are the same. This can be good for accuracy (less critical barrel harmonics)
If a barrel crown is cut perfectly symmetrical (I always cut 11° target crowns on my blanks), the turbulence you are talking about will also be symmetrical.
Otherwise, powderburners couldn’t be that accurate, because the pressure at the muzzle of a PB is way, WAY higher than the muzzle pressure of a pcp airgun.

Actually it is pretty simple, a pellet needs a certain rotation and speed to fly stable.
If this is achieved with a short or long barrel doesn’t matter.
The downside of a short barrel is the higher air consumption compared to a long barrel, but this can be partially compensated for by running a higher regulator pressure.
A short, intense pulse of air propels the pellet with a higher acceleration in the first part of the barrel, resulting in less air waste, and a more quiet muzzle report.

Regards, Gijs