Bullet: 300 gr JSP  (Speer)

Diameter: 0.451"

 

Powder: SR 4759 (Improved Military Rifle)

Starting Powder: 20.3 gr

Max Powder: 22.5 gr

 

Primer: CCI 300

 

Case: WIN

Trim Length:  

 

Cartridge Overall Length: 1.640"

 

Starting Velocity: 825

Starting Pressure:  

Max Velocity: 1,029

Max Pressure:  

 

DO NOT confuse with SR 4756 or excessive pressure will result. <br />NOTE: Seat bullet to REAR cannelure and use a neckdown crimp.

 

Source: https://reloadingdata.speer.com/downloads/speer/reloading-pdfs/handgun/45_Colt_Ruger__Contender_Only_300.pdf