A good factory ammo for my gun may work for your gun as well,Hornady.I have had great performance with them for deer and even killed bear with them 180 gr Interlock.The SST is the same bullet but the SST has more features.The first 9 elk I have killed in my life has been with Interlock 180 gr.You are correct about the bore being filthy from the factory! I cleaned that thing for a good while! I finally sprayed it with bore scrubber (the foam stuff) and let it sit for an hour or so. I then went to scrubbing some more. Finally got clean patches when running through. I shot it at 100 yards with crappy Walmart ammo I had got off of my brother. Most groups were 1 1/4 to 1 1/2 or so. I did get one right at an inch. I definitely will look into moving into a better stock. I am not a reloader, so what suggested off the shelf ammo would do better in this gun. It has a 24-inch medium contour sport type it looks like. It's not a pencil sporter. I will definitely drop some oil in the trigger as you tried. Actually, it feels serviceable at this point. I live in Pennsylvania. I am just going to use the rifle for black bear hunting. I hunt around some large clear-cut areas and power lines. There are shot opportunities that could stretch out to 3 or 400 yards easily. There is also a lot off logging roads with 125-to-150-yard shots possible. If someday I want to hunt out west the 06 seemed like it would be capable of using for these types of hunts also.
Nosler makes a good bullet as well,Ballistic tip for deer but for bear I would choose an Accubond bullet as it is bonded and way tougher than a Ballistic Tip.I have taken many deer with Remington Corelocks as well.I have not had the accuracy with Corelocks like I wanted for longer range but for 200 yards and under they work well.