Gamo Swarm Magnum 10X GEN3i INERTIA FED .22

[Goshawk]

Greetings,
I'm finding myself wanting to get a bit more quite in the starling popping category than my 22 rifle.  I bought the Gamo 22 swarm magnum kit which came with a scope and some lead pellets.  Once in hand, I assembled the rifle, went to my range and sighted it in; sort of.
My groups are in the 6" category at about 25 yards.  I went back and snugged up every screw on the scope assembly I could find, looked everything over and did another few rounds down range.  Yupper, It's still at 6", or what I'd call a full choke.
I contacted Gamo USA and was told breaking in the rifle for good accuracy takes up to 200 rounds of ammo. 
So, here's my question:
This is my first air gun.  Can I really expect this rifle to go from 6" to .5" just by shooting the snot out of it? That just seems completely unreasonable to me, but I've never owned one before.
For those with break action Gamo rifle experience, should I be sending this back, or start shooting it? 
Thanks, and a Happy Father's Day to all.

[MADMAX]

Clean it
Serious
I never thought about cleaning a pellet gun
And I added an aftermarket scope
Helped mine

[Alchase]

I have a Gammo Whisper Cat .177 cal. It did not take any “break in” period to hit bottle caps at 25 yards with a 4x scope.
Though ensuring everything is lubed up my help. That seems a bit of a spread to o make up. I would be thinking about returning it or replacing it.

[savagehunter]

I dont think thats acceptable for the cost of that rifle. And it might get better but not 5.5 inches better.

[Alchase]

What pellets are you using?

If you are not using them give the GAMO Red Fire pellets a try.
I use the Crossman Copperhead pointed pellets for just plinking and the GAMO Red Fire pellets for the critters. They hit hard and are very accurate.

[Goshawk]

All put back in the box and ready to ship back to Gamo.  Wish I had a scope mount to put my "proof" scope on it and see if that's the problem.