Loss of power after barrel clean?!

[roster11]

Good evening everyone,

Recently had my BSA Superten carbine stage 2 blueprinted by JB as its been sat in the cupboard for a few years unused. I Chrono'd it when i got it back and it was running around 11.25 ft/lbs with AA field 16grn. Thought id clean the barrel and iv run about 50 pellets through it and the power is now consistently running at 10.5 ft/lbs. Has anyone noticed a power drop after a barrel clean before its fully leaded up again? 10.5 ft/lbs is quite ample for me, just strange its dropped a bit.

Thanks for reading!

Tom.

[hmangphilly]

Good evening everyone,

Recently had my BSA Superten carbine stage 2 blueprinted by JB as its been sat in the cupboard for a few years unused. I Chrono'd it when i got it back and it was running around 11.25 ft/lbs with AA field 16grn. Thought id clean the barrel and iv run about 50 pellets through it and the power is now consistently running at 10.5 ft/lbs. Has anyone noticed a power drop after a barrel clean before its fully leaded up again? 10.5 ft/lbs is quite ample for me, just strange its dropped a bit.

Thanks for reading!

Tom.

It happens often Tom

Don't worry , stick some lead through , it'll come back .

[Lol Moore]

Seen on all the barrels I have ever owned, the only difference being in how long they take to lead up.

Could it be these drastic changes in velocity are the reason for the inaccuracy after cleaning, maybe changes in harmonics ?

See here:

http://www.airgunbbs.com/showthread....after-cleaning

[roster11]

Cheers guys,

Had a thought earlier after I posted. Maybe a combo of the Baltic weather and the clean barrel would have caused the drop in power. May re-chrono tomorrow in the house and see if it improves.

[angrybear]

I'd think it more likely to be the "sat in the cupboard for a few years unused" that's responsible for the power drop, than cleaning the barrel .

[roster11]

Guess you didn't read the full post bear.