09-12-2020, 12:19 AM
Went out today and worked with RL15 with the Hornady 95 grain SST's and H322 with some Speer 70 grain TNT's. I continued my use of CCI BR4 primers.
Since I had been working up a load with the RL15 and was getting some decent velocity and no pressure signs, I decide to push the envelope a bit. I started with 28.1 grains which is .1 over Hornady's recommended maximum and got nice, consistent 1 inch groups. At 28.4 and 2673 I began to see faint scoring on the case head. And then at 28.7 and 2696, the scoring was more pronounced and although the primers weren't pancaked and shells were ejecting with no problem, I decided I'd had enough fun with that powder/bullet combination and I had myself a good node to work with.
Next up was the work with the Speer 70 grain TNT's because I do quite a bit of varmint hunting and I've used those bullets in my 6PPC and my .243 Winchester bolt gun. First load was 28.3 which gave me 2989fps and 1 inch groups. 28.7 gave me 3034 and a 7/8th inch group.
Then the rain began and my chronograph doesn't like to play in the rain, so I called it a day, bundled my stuff up and headed for the house. I continue to be impressed with this cartridge. Every combination of bullets/powder/primer that I've thrown at it has worked quite well
Since I had been working up a load with the RL15 and was getting some decent velocity and no pressure signs, I decide to push the envelope a bit. I started with 28.1 grains which is .1 over Hornady's recommended maximum and got nice, consistent 1 inch groups. At 28.4 and 2673 I began to see faint scoring on the case head. And then at 28.7 and 2696, the scoring was more pronounced and although the primers weren't pancaked and shells were ejecting with no problem, I decided I'd had enough fun with that powder/bullet combination and I had myself a good node to work with.
Next up was the work with the Speer 70 grain TNT's because I do quite a bit of varmint hunting and I've used those bullets in my 6PPC and my .243 Winchester bolt gun. First load was 28.3 which gave me 2989fps and 1 inch groups. 28.7 gave me 3034 and a 7/8th inch group.
Then the rain began and my chronograph doesn't like to play in the rain, so I called it a day, bundled my stuff up and headed for the house. I continue to be impressed with this cartridge. Every combination of bullets/powder/primer that I've thrown at it has worked quite well