The last test with this rifle had case necks so loose that the bullets fell back onto the powder when chambering. Accuracy was really good, if you wanted to use ALL the target. Back in the loading room, I switched out the .248 bushing for a .246 bushing. The same test was run with the same batches of bullets. The powder charge used the highest charge last time as the starting point and increased in half click increments. IMR 4227, CCI 450 primers. Powder charge this time 13.3 grains through 14.3 grains. The final group was with 300MP at 12.4 grains.
The bullets were RCBS 22-055 SP about 18 BHN, gas checked and lubed with Blue Angel. The coated bullets used Eastwood Ford Light Blue, ASBBT; baked at 400 degrees for 20 minutes. The coated bullets did not shoot well until hitting 2400 fps. When looking at all the 4227 loads, the choroplast backer showed that the bullets were entering at an angle. The group with MP300 showed point-on hits on the target and was the smallest group for coated bullets at 1.2". The average for the coated groups was 2.837 for 5 groups of ten shots.
The uncoated bullets averaged 1.625" for 5, 10 shot groups. Four of these groups were about 1.250, with one group of 3".
The bullet coating looks like a viable thing. My wife liked the 30 caliber bullets because they were shiny and clean. I shot a few samples of these. I forgot how much that rifle kicks. A ten shot group of 1.375 and a 7 shot group of .875. That's all the sample I made. These were coated with Smoke's Jet Black to match the color of her rifle's stock. No lube was used on these.
