Alex Wheeler
Well-Known Member
Im just starting to work with a 300 PRC. I didnt find a ton of data when I looked so Im putting some up. Barrel bore and groove dimensions do vary! Actually a lot. That has a huge effect on pressures. Work up to any loads carefully in your barrel because it may be very different. My reamer is slightly different as well, but not enough it should have a noticeable effect on pressure. Bat HR actions handle pressure better than any I have used, ADG brass is also very tough. Keep that in mind.
The rifle is a Bat HR with a Bartlien 9tw 5r at 28" in a McMillan A3.
The first powder I tried was RL23 with a 210vld .020 in . I couldnt find any info so I found a safe window on quickload using 94 grains of H2O for the case capacity. Thats what my new unfired ADG brass weighed.
72-2965
72.4-2959
72.8-2989
73.2-3024
73.6-3016
74-3062
74.4-3061
74.8-3077
75.2-3090
75.6-3113
I didn't like the look of the ladder, this was not the right powder for this barrel. I was surprised at the speeds it got though as its on the fast side for this case. The Barrel was still pretty green at this point, so as its speeds up it may not get to that upper end but at this time there was no sign of pressure.
The next combo I tried was H1000 and 230 Berger hybrids .020 off.
77-2907
77-2901
77.4-2923
77.8-2946
78.6-2950
79-2958
79.4-2971
79.8-3002
80.2-3000
80.6-3036
This ladder looked great, 2 obvious nodes, 2901-2923 held .658" of vertical at 600yds, 2971-3002 held .714". 3 shots in each node. This is the combo this barrel is going to like, 3 shot groups around each node at 1k is the next step. Then fine seating and hopefully its done. It was cold today, and the barrels at about 60 rounds. I do not know if the upper node will be do able in warm weather but I have no signs of pressure today.
I also loaded 7828ssc because I like that powder. Again with 230s.
I think I missed the window though as I went up to 75 and only got to 2842. The ladder didnt look good so I wont continue with this powder. One thing to note, the last shot of the day was a sighter I loaded with this powder it did not fire. It was 16 degrees and had sat outside for a good hour. I pulled the bullet and the powder was scorched. I was using 250s but in the future I will go to fed 215s for this powder. The 250 was not hot enough to light it that cold.
So far the 300 PRC seems to be an over achiever. The others I have built have also been that way. I am a little surprised at the velocities you can get out of this case. I'll update this post as I keep tuning.
The rifle is a Bat HR with a Bartlien 9tw 5r at 28" in a McMillan A3.
The first powder I tried was RL23 with a 210vld .020 in . I couldnt find any info so I found a safe window on quickload using 94 grains of H2O for the case capacity. Thats what my new unfired ADG brass weighed.
72-2965
72.4-2959
72.8-2989
73.2-3024
73.6-3016
74-3062
74.4-3061
74.8-3077
75.2-3090
75.6-3113
I didn't like the look of the ladder, this was not the right powder for this barrel. I was surprised at the speeds it got though as its on the fast side for this case. The Barrel was still pretty green at this point, so as its speeds up it may not get to that upper end but at this time there was no sign of pressure.
The next combo I tried was H1000 and 230 Berger hybrids .020 off.
77-2907
77-2901
77.4-2923
77.8-2946
78.6-2950
79-2958
79.4-2971
79.8-3002
80.2-3000
80.6-3036
This ladder looked great, 2 obvious nodes, 2901-2923 held .658" of vertical at 600yds, 2971-3002 held .714". 3 shots in each node. This is the combo this barrel is going to like, 3 shot groups around each node at 1k is the next step. Then fine seating and hopefully its done. It was cold today, and the barrels at about 60 rounds. I do not know if the upper node will be do able in warm weather but I have no signs of pressure today.
I also loaded 7828ssc because I like that powder. Again with 230s.
I think I missed the window though as I went up to 75 and only got to 2842. The ladder didnt look good so I wont continue with this powder. One thing to note, the last shot of the day was a sighter I loaded with this powder it did not fire. It was 16 degrees and had sat outside for a good hour. I pulled the bullet and the powder was scorched. I was using 250s but in the future I will go to fed 215s for this powder. The 250 was not hot enough to light it that cold.
So far the 300 PRC seems to be an over achiever. The others I have built have also been that way. I am a little surprised at the velocities you can get out of this case. I'll update this post as I keep tuning.
