I have been very annoyed to find I cant hit a bull in the bum with my CVA, since the old ticking I used for patches ran out. I am talking six to ten inch groups at 50m benchrest, with flyers! Yet I had some years ago got six of thirteen into five inches at 100m! I use too many rifles, so have not paid attention that each was giving the best until now. Charges: 55 volume grains of Pyrodex, with 180gn .490 balls cast from roofing lead. Patches: I tested a bunch of materials, using a micrometer, and found several to try. Best was a Cotton Duck at .016". Shot with the .013 sworkshort (Hi-VIs!) a big and flyer-ridden group; the .016 tightened it a lot! I use hardware store soluble oil about 25% in water for lube, wet the patches before shooting a group. Tried pre-lubing and sun dried patches. Big groups. My Lee .490 2-cavity mold had a tiny burr, which made balls looking poor at the sprue. I weighed the bastards, and eliminated outside 3 standard deviations. (5%, mostly low side weights). The median weight was 179.1g, and the 3SD range I kept was 177.85 to 108.2g. The groups were still lame. I will weigh again. Next time, I keep those inside TWO standard deviations. (I also had three negligent discharges, from loose set trigger adjustment screw being turned in by fingers on the firing line. This rifle I had previously shown in this thread: Old thread about negligent discharges ) I also need to figure out this patent breech; I believe my cleaning is not getting the inside part clean. I put a 9mm long jag on a rod and wrap a strip patch, but cannot feel that I get inside anything, or any lip. That doesn't bear on bad accuracy though. Then there is eyesight. I use +2 $20 reading glasses, with a 2mm knifed aperture in black electricians tape as an iris. The electrical tape adhesive gets old and mucky on the glass so I need to clean that and make it neat. SO what else could be a cause of bad accuracy? Sunshine on the sights? No, we are under a roof. I plan to open the notch on the rear sight, its a bit narrow.