Need education from the Savage experts regarding current production short action model bolt interchangeability with older stagger feed models.. The rifle in question was made in year 2000, with the standard trigger, just before the introduction of the Accu Trigger across the full line of Savage production rifles. Short action 12FV with the old 4.27" action screw spacing, top bolt release, and stagger feed blind magazine, in .223 Rem. Can a current short action factory .223 bolt with the correct .223 bolt head be safely used interchangeably? Are the dimensions the same and is this even possible without re-head spacing the individual bolt and the barrel? Didn't know if the floating bolt head would allow this, or even if so, if the current center feed type is completely different. From photos, I can see that the current bolt body has a relief machined in the rear that the 2000 model didn't have...maybe due to the Accu Trigger mechanism or bottom bolt release? I know there are some different variations in bolt heads, internal sizes of the firing pins/cross pins and other changes running through this 20 year timeline. Thanks much for your information.