lordpaxman
Member
- Joined
- Jun 4, 2011
- Messages
- 2,444
Had anyone loaded .243 and IMR 4955 and discovered high velocities and or excessive pressures?
This thread isn't meant for "what's the best powder, bullet, primer, case etc for .243".
My other .243 reloads are all in line with existing Hodgdon reloading data, when looking at min/max velocities.
I obtained some 103 ELD X bullets, and used the online 105 AMAX load data for IMR 4955. That specifies 41.9 gr to 45.6C gr and 2723 fps to 2959 fps, 2.760 COL. (there's no data for the 103). My OCW workup had me starting at 41.0 gr, and I wanted the bullet jump to be .015" so my COL was 2.800".
The 41.0 gr (this is below minimum but .9*Max) had a 3 shot average of 2975. This is greater than the Max velocity stated. I pushed one more OCW string which in the workup is 41.9 gr which happens to be the starting charge weight and that yielded a 3 shot average of 3032.
I pulled the remaining and checked charge weights and they were all correct. I've read elsewhere that 4955 results in higher than anticipated velocities and was wondering if anyone else has seen that in .243?
This thread isn't meant for "what's the best powder, bullet, primer, case etc for .243".
My other .243 reloads are all in line with existing Hodgdon reloading data, when looking at min/max velocities.
I obtained some 103 ELD X bullets, and used the online 105 AMAX load data for IMR 4955. That specifies 41.9 gr to 45.6C gr and 2723 fps to 2959 fps, 2.760 COL. (there's no data for the 103). My OCW workup had me starting at 41.0 gr, and I wanted the bullet jump to be .015" so my COL was 2.800".
The 41.0 gr (this is below minimum but .9*Max) had a 3 shot average of 2975. This is greater than the Max velocity stated. I pushed one more OCW string which in the workup is 41.9 gr which happens to be the starting charge weight and that yielded a 3 shot average of 3032.
I pulled the remaining and checked charge weights and they were all correct. I've read elsewhere that 4955 results in higher than anticipated velocities and was wondering if anyone else has seen that in .243?