Gamo Big Cat hometune question

[xschug3]

I've been having some trouble getting consistent accuracy with my hometuned BC now. I'm curious if there are any post-tune tips that I should know about? ie. Is it important to clean the barrel after a tune? For some reason I'm not getting the same accuracy I was getting before the tune. The gun definitely shoots harder. I've tried the basic things such as checking all the stock screws and the scope and mount, all those screws are tight. I'm also using the guns favorite pellets: JSB exacts.

Anyone have any ideas?

[ezman604]

I would say that tuning made a difference in the velocity, therefore changing the diet the gun wants. Especially if everything is tight and you are getting positive lockup with the barrel. If you have them, try different weights and styles of ammo. Do you have or have access to a chrony? (sorry...just reread above you do not have a chrony) That would help determine the weight of pellet to try. I'd suggest CPHP or something heavier like CP Ultra Mags.

[Bogey]

Trey,  after you got your AG back together and fired the first initital  shots,  have you run any patches through the bore?   Might want to give it a try if you have not.  Just run clean patches through until they come out clean.   Just use dry patches and check if the bore is dirty.   I have found that after tuning ,  that after the first  3 to 6 shots it is best to remove any excess lube or whatever that is   blown out of the compression chamber.

[xschug3]

Great idea Bogey, thanks for the tip I will do that.

[gamo2hammerli]

Bogey, my exact thoughts.  After a tune and especially with some new lube....usually abit always gets into the compression chamber and that oil will go into the barrel.  My first ever lube job I applied a little too much moly paste on the cylinder/inside of receiver wall and caused about 8 detonations before it quieted down.  For sure some of the lubes got into the barrel.

Also with a new spring and lube....the air rifle might like different pellets like ezman said.  That have happened to almost all of my air rifles after a lube job.