I was able to test a little this morning with the new IMR 4166 powder using some SMK 107GR. and some custom made 106gr. projos. I first loaded 5 rds of 30.0gr. of varget and 30.0 grs. of the 4166. The 5 rds of varget loaded ammo made a nice ragged hole and the following 5 rds. of the 4166 load followed in the same group with no noticeable variation of the group size.
Unfortunately my chronograph did not register any of the 30.0 gr loads. So I decided to try 30.5 gr. of the 4166 based solely on that I won a 3x600 with 30.5 gr of Varget with a Berger Hybrid. The chrono finally decided to start picking up the bullets velocity, the load of 30.5 gr. of 4166 was 2943,2945,2948. I use a Bartlein 1-8 twist 30in long mounted to a Barnard P Action.
Once I found the jump sweet spot 0.025 with the SMK 107gr. and .010 for the custom projos. the 3 rd group was basically a 6mm hole. Yes I know that is not a true test of the load, but I was running out of time and I will do a 30 rd test at 300yds. as I would shoot a match prone with a sling and iron sights.
The powder is for as far as I can tell it very close to varget, the copper fouling eraser, well I dont know if it works or not as I coat the barrel with HBN.
Unfortunately my chronograph did not register any of the 30.0 gr loads. So I decided to try 30.5 gr. of the 4166 based solely on that I won a 3x600 with 30.5 gr of Varget with a Berger Hybrid. The chrono finally decided to start picking up the bullets velocity, the load of 30.5 gr. of 4166 was 2943,2945,2948. I use a Bartlein 1-8 twist 30in long mounted to a Barnard P Action.
Once I found the jump sweet spot 0.025 with the SMK 107gr. and .010 for the custom projos. the 3 rd group was basically a 6mm hole. Yes I know that is not a true test of the load, but I was running out of time and I will do a 30 rd test at 300yds. as I would shoot a match prone with a sling and iron sights.
The powder is for as far as I can tell it very close to varget, the copper fouling eraser, well I dont know if it works or not as I coat the barrel with HBN.