Hatsan barrel wierdness

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1965BJS

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Alberta
I have a Hatsan air rifle that has been my favorite for the last 10 years or so.
Its a good gun but it seems to have a bulge in the barrel.
When i run a patch through it, I can feel the resistance, but it always goes easier for a little ways, about 3\4", then, it is back to normal for the rest of the barrel length!
This happens at the exact same spot every time, even when patching from either end of the barrel, the bulge is in the same spot.
Crazy thing is that when it is borescoped, the rifling is true right through the bulged spot!
I would imagine a little bit of force is being lost when the pellet passes through this spot, but it shoots reasonably good even though I think it can do better.
Has anyone else seem a bulge like this before?
I have countless thousands or rounds through it and keep it religiously clean, rifling looks great, just puzzling how the rifling is still true through the bulged area? How is the rifling created if it can follow a contour like this?
 
When I push a pellet down my barrel I feel a few changes in resistance as it travels along. I think most air guns may have variance in their bores done during manufacturing. I wouldn't worry about it, in fact it may work like a choke. As the pellet moves down the barrel the air pressure causes the skirt to expand and the near the end the barrel constricts ensuring a snug fit to the rifling. But thats just a guess, make sure your crown is good as thats a part you can do something about.
 
Good point, the gun shoots good enough to hunt with, I was just confused about why the barrel is like it is.
Does any manufacturer purposely do this?
How does a barrel get rifled exactly? Is it done while hot or is it bored out?
Thaks for all the replies, going to hit google hard for some info now!!
 
If the barrel is hammer forged, and that's most likely, then the hot barrel blank, which is shorter, fatter and with a larger bore hole, is placed over a negative template of the finished bore, including rifling, and is hammered into shape. Then they can slide and twist it off, and finish the outside on a lathe, if required or desired.
 
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