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Rooster, weigh the charges until you are dropping the desired amount. This way when you adjust you will know if you are going in the right direction. Do not ever trust what the disk is suppose to throw. Different powders will not measure the same through the disk, that is why you need to weigh them. Good Luck

SPR GDHP I believe relates to the bullet. I am not familiar with these abbreviations, although, Spr may be Speer and HP normally stands for hollow point. A Hor 55 GR FMJ-BT is a Hornady 55 grain Full Metal Jacket Boat Tail. You can not load a 55 gr Hornady bullet and a 55 gr Sierra bullet with the same charge. This has to do with sectional density and ballistic coefficient. If you jack-up certain bullets fps. too much they will disintegrate in flight. I hope this helps.
 
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