I have already shot my weight in REX powders
REX powder III is a little slower than unique I use it in bottleneck rifle cartridges,and is very accurate. We call it green box rex
Magnum rifle primers,or Winchester large rifle primers,no fillers.
Lee measure ,double disk .88x2 in the 308w and 303 br. bullet weight 170 to 220 grs.
.95 x2 in the '06 with the Harris Kala Nei bullet ,around 165 grains ,clocks at 1500 fps..is good to 300 meters.
I use it in the 375H&H and 458 Lott
I make great pistol cartridges with the RED box rex N°I and the Blue BOx N° 0,
they are faster powders ,use the Bullseye starting loads.Be aware that the powder weight is only one of the many factors of the cartridge pressure.
look http:// http://www.siarm.it/index.php?cPath=131_135>www.siarm.it/index.php?cPath=131_135
home page articoli polveri REX PLO 21 You can see the colour of the boxes and the various numbers of them.
I only used one box of Yellow Box Rex N°II ,I did not like it you need more powder to achieve the same speed you can get with RED & BLUE:in pistol loads.
The only real defect of theese powders is that that their granules are practically identical in shape and colour, keep only one can on the loading table at a time.