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Staring from scratch, you have the press I have to assume nothing else.Reloading manual - Lee, lyman , Hornady etc. with reloading instruction in it not just a data pamflet204 Ruger Full Length sizing die set204 Ruger/ .378 head size shell holder also used for .223, 222RemResizing lube to keep the brass from sticking in the resizing dieScale for accurate measuring of powder I prefer a beam scale but electric worksSet of calipers, a decent Digital one can be purchased at Harbor Freight for under $20 you'll use it for checking case length and bullet seating depthCase trimer An inexpensive Lee will work well and is pretty near foolproofCase chamferring tool to taper the inside of the case mouth so the bullet will enter easier and take the shap edge off the outside of the case mouthPrimer pocket cleaner to remove the prime residue so the new primer can be seated completelyIf your press doesn't prime I'd pick up a hand primer, the Lee works very well and is reasonablePrimers small rifle I would sugest a thick cup primer like CCI 450 or Rem 7 1/2Powder and bullets you can decide which is best after reading your loading manual.AWS