OK so as the title suggests I am new and trying to get a grasp on reloading. I have purchased a RCBS reloading starter kit. Bought all of the dies needed for my firearms. I have purchased a few of the bullets that I have used with my factory ammo (Nosler Ballistic Silvertip, Nosler Ballistic Tip. The factory ammo I have been using is Winchester XP3 & XP2. I have been saving my cases from the aforementioned factory ammo. All I need (I think) in the way of components to go forward, is propellant, primers and recipes. My RCBS kit came with the Speer Reloading Manual #14, I also bought The ABC's of Reloading 8th Edition. I am reloading for the following... 300 WSM, 30.06 SPG, 308 WIN. And the stupid question is... Using the salvaged Winchester cases and the new Nosler bullets, I would like to basically reproduce the Winchester loads I've been buying off the shelf. Everything I have read on the topic of reloading stresses to adhere the the "reloading manuals" when it comes to developing loads. The Speer Manual, does not list the specific components (brand names) that I have acquired i.e. the Nosler (brand) bullets with the WIN cases. It does list the 760 propellant (which is the Winchester brand). The load data listed in the Manual (using 300WSM 180Gr. as an example) shows 61.0gr of 760 powder as a starter load, with a max load being 64.0gr. But when you go to the Hodgdon reloading data center web page... (Cartridge Loads - Hodgdon Reloading Data Center - data.hodgdon.com) it lists the following information... 59Grs. of the 760 power, not to exceed 62.5 Grs. Is this due to using a different brand name of bullet?