Hi I recently purchased a Savage in 204 Ruger 1-12 twist. Its a single shot and is about 10 years old. I want to use it mainly for 39 & 40 gr. bullets, but I find that neither shoot well, the groups are erratic at best. With 40 gr. VMAX, using both 8208 and 10x powders. I may get 2 together and then 2, 4 or 5 inches to the left. With the 39 gr. Sierras I had one that appears to be key holing and others may not be hitting the paper at all. With lighter bullets it is much better. I took it to a rifle builder/gunsmith he said the rifling and crown look good. Then added that he is seeing more 204's with 1-12 twist coming in with problems stabilizing the heavy bullets. Is anyone else seeing this problem?