I have a Lyman and a Hornady reloading book. I am typically reloading 223 and noticed the the two books do not line up with the powder loads at all. I am specifically looking at the 75 gr BTHP round utilizing Varget powder. The Hornady book indicates a starting load of 19.4 gr and a max of 23.5 gr and a max velocity of 2600 fps. The Lyman book indicates a starting load of 23.0 gr and a max of 25.6 gr with a max velocity of 2843 fps. The only difference that I can see between the loads is the primers. The Lyman book uses Remington 7.5 primers and the Hornady uses WSR primers.
I also know that Hornady makes match grade cartridges which have a muzzle velocity of 2790 fps but I am not sure what powder is being used.
I noticed similar trends in a few other calibers and loads. Is the Hornady book just being conservative? Am I missing something in particular? Is it safe to use the Lyman numbers if I build up to them?
I also know that Hornady makes match grade cartridges which have a muzzle velocity of 2790 fps but I am not sure what powder is being used.
I noticed similar trends in a few other calibers and loads. Is the Hornady book just being conservative? Am I missing something in particular? Is it safe to use the Lyman numbers if I build up to them?