blksno
Well-Known Member
Starting this thread just because I have had a hard time finding decent load data for a 300 Norma Mag Imp with RL33 and heavy for caliber bullets. I may end up testing 245 Bergers as well...and of course I'll probably end up having to use VV powder but I'm going to focus on RL33 until it's gone.
I know it's going to get harder and harder to find but since I have some, and this is what I wanted to start with...I'm gonna post my findings.
300 Norma Mag 35° Imp
ARC Coup De Grace
28" Benchmark by TS Customs
Foundation - TriggerTech Special
250gr Atip
NF ATACR 7-35x
0.010 off the lands
Started with 100 rounds of 230 Hybrids with H1000 and while accuracy was great in the fire forming loads, I wasn't really all that impressed with velocity.
I'll update more as I go, was only looking for pressure signs and didn't come across any yet which impressed me so far.
1/6/25
sunny - calm - 20° (wind chill 14°)
Tested
91.0 - 2979 fps
91.5 - 2958 fps
92.0 - 2999 fps
92.5 - 2969 fps
93.0 - 2979 fps
93.5 - 2993 fps
94.0 - 3022 fps
(Group below)
Sent the first 3 getting (zeroed) on paper at 300 yds and touched off the last 3 at a fresh "X"
Plenty of room to focus and get settled in, but this is pretty fair for a starting load.
At 3000 FPS, there isn't really much need to "push" the load, but I will go a pinch higher to see where pressure gets weird.
Sub 1/2 MOA across a full grain spread and 43fps shows promise
I know it's going to get harder and harder to find but since I have some, and this is what I wanted to start with...I'm gonna post my findings.
300 Norma Mag 35° Imp
ARC Coup De Grace
28" Benchmark by TS Customs
Foundation - TriggerTech Special
250gr Atip
NF ATACR 7-35x
0.010 off the lands
Started with 100 rounds of 230 Hybrids with H1000 and while accuracy was great in the fire forming loads, I wasn't really all that impressed with velocity.
I'll update more as I go, was only looking for pressure signs and didn't come across any yet which impressed me so far.
1/6/25
sunny - calm - 20° (wind chill 14°)
Tested
91.0 - 2979 fps
91.5 - 2958 fps
92.0 - 2999 fps
92.5 - 2969 fps
93.0 - 2979 fps
93.5 - 2993 fps
94.0 - 3022 fps
(Group below)
Sent the first 3 getting (zeroed) on paper at 300 yds and touched off the last 3 at a fresh "X"
Plenty of room to focus and get settled in, but this is pretty fair for a starting load.
At 3000 FPS, there isn't really much need to "push" the load, but I will go a pinch higher to see where pressure gets weird.
Sub 1/2 MOA across a full grain spread and 43fps shows promise
