RG4570 and RD's TLC460-425-RF
Posted: 11 Nov 2012 08:31
I've started working with my 425-grain bullet in the Rio Grande, prepping for a hunt. I'm limiting pressure on the RG to 35.0 KPSI and shot strings to mainly establish the velocities at this pressure but also take a peek at potential accuracy. I was shooting with a Lead Sled Solo across a chronograph screen and it tends not be the best way to test accuracy in that there is so much shooting but still I can get an idea of the potential. I shot all the the appropriate Hodgdon except H4198 and Varget as the QuickLoad velocity projections where really low based on the 35.0 KPSI ceiling.
The bullets where sized at .458" and the cartridge overall length at 2.500". Feed and function through the rifle is outstanding. Here is how things lined up.
Next, I wanted to see what the terminal performance looked like out at 150 yards, would any difference between those velocities over 1700 FPS really matter.
Between my most accurate 1700 FPS+ loads, I loose about 7 points or approximately 4% of the potential killing authority. I will take a closer look at both H322 and H335 as shot from the bench at 100 yards vs. the Lead Sled at 50 yards and see how they measure up. What's another 20 rounds at 41 ft/lbs of recoil!
The bullets where sized at .458" and the cartridge overall length at 2.500". Feed and function through the rifle is outstanding. Here is how things lined up.
Next, I wanted to see what the terminal performance looked like out at 150 yards, would any difference between those velocities over 1700 FPS really matter.
Between my most accurate 1700 FPS+ loads, I loose about 7 points or approximately 4% of the potential killing authority. I will take a closer look at both H322 and H335 as shot from the bench at 100 yards vs. the Lead Sled at 50 yards and see how they measure up. What's another 20 rounds at 41 ft/lbs of recoil!