slugged an unmashined LW barrel

[Deleted member 33063]

i purchased an unmashined .177 1:16 no choke LW barrel and decided to pass a few slugs and pellets through it. when i passed through the stamped side the slugs jammed around 1 inch before the muzzle and damaged the slugs. BUT when i passed them muzzle first the slug came out perfect . and worth mentioning that there is no resistance at all they just come out like they slide on butter the head of the pellet didnt touch the riffling at all

 

[subscriber]

That sounds like there is a directional burr at one end of the bore. In one direction the burr grabs the projectile. In the other direction, the burr just squashes the lead.

You really should de-burr the barrel before slugging it. That means creating at least a small burr-less chamfer. Else you are measuring the effect of the burrs in constricting the bore, rather than the actual barrel.

 

[Motorhead]

Sounds like a CHOKE is present !!

YES a slug will hang up @ 1" from muzzle due to said choke if present.
Put slug threw choke first, indeed the slug will pass down barrel w/o touching rifling and appear smooth
** One needs to prep barrel as in a LEADE and a proper Crown before determining condition of bore end to end.

 

[RM.510bigbore]

Sounds like a CHOKE is present !!

YES a slug will hang up @ 1" from muzzle due to said choke if present.
Put slug threw choke first, indeed the slug will pass down barrel w/o touching rifling and appear smooth
** One needs to prep barrel as in a LEADE and a proper Crown before determining condition of bore end to end.

Usually when buying raw barrel blanks 1 inch should be cut off both ends...when you pull a button.rifeling through more stress at.both ends...normal barrels.not.choke.airgun. stuff..