I am shooting at 300 yards now with the 20 prac.. I changed my burris scope out for a working Nikon 4x12..
Anyway my 100 yard load wasn't working for 300 yards.. Even though I was under a dime at 100.. At 300 yards my groups went well over 3 with the closest bullets being 3 in a group out of 5 at 1.5 inches.. So I worked new loads and went from 3 inch group down to a 1 inch group..
Like this.. I loaded 3 at 26.3 and shot them at 1930 OG measurement.. That group was almost 3 inches.. My next 3 was loaded also at 26.3 but seated at 1925.. That 3shot group dropped to under a quarter at 300..
I also worked up 25.9 and shot 3 at 1930 and 3 at 1925 and 3 at 1920 all OG measurement.. Now the first 2 groups at 1930 and 1925 was large and uniformed.. The 25.9 1920 put 3 under a quarter at 300..
I also did 9 rounds at 26.1... 3 at 1920 3 at 1925 and 3 at 1930 They would not produce anything..
But has anyone else had this happen just with a seating depth change?? I got to powder charges now that shoots under a quarter at 300 with 2 different seating depths..
I will load up more of these charges and see if was a fluke or what?? Also the impact on the target from these 2 was very close to where they hit.. Almost identical really..
This was an extreme group shrink just from changing the seating depth.. Dan
Anyway my 100 yard load wasn't working for 300 yards.. Even though I was under a dime at 100.. At 300 yards my groups went well over 3 with the closest bullets being 3 in a group out of 5 at 1.5 inches.. So I worked new loads and went from 3 inch group down to a 1 inch group..
Like this.. I loaded 3 at 26.3 and shot them at 1930 OG measurement.. That group was almost 3 inches.. My next 3 was loaded also at 26.3 but seated at 1925.. That 3shot group dropped to under a quarter at 300..
I also worked up 25.9 and shot 3 at 1930 and 3 at 1925 and 3 at 1920 all OG measurement.. Now the first 2 groups at 1930 and 1925 was large and uniformed.. The 25.9 1920 put 3 under a quarter at 300..
I also did 9 rounds at 26.1... 3 at 1920 3 at 1925 and 3 at 1930 They would not produce anything..
But has anyone else had this happen just with a seating depth change?? I got to powder charges now that shoots under a quarter at 300 with 2 different seating depths..
I will load up more of these charges and see if was a fluke or what?? Also the impact on the target from these 2 was very close to where they hit.. Almost identical really..
This was an extreme group shrink just from changing the seating depth.. Dan