25-243-40*
- Thread starter MrGee
- Start date
The 257 Durham Jet is the 308/243 case necked to 25 caliber with a 40 degree shoulder with minimum body taper. This may be what you are looking for or you can at least use the data for a starting place. This data is out of the Ackley Shooters Manual Vol. 1:
100 gr bullet- 44.5 gr H380 max- 3180'ps
- 48.5 gr IMR 4350- 3330'ps
- 49.5 gr IMR4831- 3240'ps
115 gr bullet- 51.0 gr H450- 3100'ps
117 gr bullet- 46.0 gr IMR4350- 3110'ps
- 47.0 gr IMR4831- 3055'ps
All loads listed above are max loads. Use caution. Ackley is noted for loading to the absolute max. Don't start at just 10% below these but lower. You may never get to these max loads before locking a bolt up with too much pressure. YMMV.
100 gr bullet- 44.5 gr H380 max- 3180'ps
- 48.5 gr IMR 4350- 3330'ps
- 49.5 gr IMR4831- 3240'ps
115 gr bullet- 51.0 gr H450- 3100'ps
117 gr bullet- 46.0 gr IMR4350- 3110'ps
- 47.0 gr IMR4831- 3055'ps
All loads listed above are max loads. Use caution. Ackley is noted for loading to the absolute max. Don't start at just 10% below these but lower. You may never get to these max loads before locking a bolt up with too much pressure. YMMV.
Thanks Trap""" L i've been looking around an your the 1st to come back with a Kind pun< of an answer .. i Appreciate that i'm only in the planning stage so far but looking foward to this project.. i have a 700 action on the way here an still tring to figure how it will all come together