I was at the 100yd range early this spring and a young fellow came in and took the bench beside me. He didn't have much with him other than his new rifle in a case, ammo and a front rest. He started shooting with his bbl resting on the rest with nothing supporting the rear. I suggested that he might have better results if the rifle rested on the forend and there was a rear bag. I offered to let him use a sand bag I had with me. He then confessed that he didn't have much experience and asked if I could help him get it on paper and sighted in. We went back to the 25/50 range to get it on paper where I discovered that the mounts were loose as were the the receiver screws. He had just bought this new rifle and this is how it came to him.
IIRC it was an Axis in 6.5CM. Once we got everything fixed up, it was a pretty good shooter at about 1" at 100yds. He was quite pleased with it but would have certainly wasted a lot of ammo getting where he needed to be without a tune up.
We were all there at one time, esp us older guys who didn't have youtube to mentor us when problems came up.