Ruger .44 Magnum Not Extracting

I have a Ruger .44 Magnum carbine purchased in the late 70's. It probably has less than 100 rounds shot through it. The problem I have is that spent shells are not extracted from chamber. The bolt is being shoved back by the gas piston because shells from the tube magazine are fed and that does not occur unless the bolt moves all the way to the rear. But the fired shell does not leave the chamber. I see barely little marring of the rimmed cartridge where the extractor gets hold of it.

Now here the weird thing. If I place a fired round in the chamber and close the bolt with a live round in the magazine, then pull the bolt back with my hand, the empty shell is extracted and ejected with the live round being chambered. It works properly when not fired. Evidently a fired case is much harder to remove than a cool previously fired one.

I've removed the bolt and pushed the pin out of the extractor. There was some old grease under the extractor which I cleaned up. I have not gotten a chance to fire it yet to see if that worked.

I am shooting reloads. The load is 21.5 grains of Hercules 2400 with a 240 grain Sierra HP bullet and a large pistol primer.

Is this a common problem? Any advice would be appreciated. Lastly, occasionally the gun functions properly.

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