Interesting question. However, the answer could well be all...most....or none. The forging...even of the Howa, consists of turning a basic hunk of gun steel into something roughly resembling a receiver. The vast majority of the actual work is done by machining. The real question is, which rifles have receiver BLANKS which are formed by forging, from a billet...or might be investment cast ? I know of none which are investment cast. However, most of the ones of which I know are actually machined from a rough blank....which is itself machined from a billet. So, IF you are somehow implying with your question that a rough-forged receiver is somehow better than a fully machined one....I'd have to say - nonsense. If comparing a forged blank....and an investment-cast one.....you might have an argument. However, ultimate strength and stability has more to do with the DESIGN, rather than the process used to create the crude blank.