questions on no.1 mk.3 wire wrapped rifle

[c141b]

I fired this rifle at the 100 yard range and it hit about 6 feet to the right. the bore looked bright and shiny. The fired shell had a slight bulge across from where it fit in the chamber and where the ejector cut out whould be, (see pictures ). Is the expansion of the fired shell ok? What does the .001 cause if any? The rifle has no marks on the top of the receiver. I know it is a grenade launcher type. Do you think the wire wrap caused it to shoot the the right? Any input whould be help full. The picture of the fired shell is not to clear. Shell expansion is .455 with a slught bulge on right of shell of .456.

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