After removing the barrell assembly etc. for cleaning purposes do i need to reshoot my rifle to check it for accuracy?..i was checking it to see if it was an sb1 or an sb2 receiver last night and went ahead and did a clean job.....also , does the new .444 marlin barrel come compatible with 04' and up sb2 handi's or do you have to buy the .444 as a whole package new?...anyone that could educate me on the .444 would be greatly appreciated..i am lookling for a larger caliber barrel...thanks a bunch , cap