scratch rifling

[crowbar]

Spinning a drill will just cause rings,you need a slow helix 1 in 16" is common ,you could do it by hand pushing a glass rod
with emery glued to it along the barrel whilst feeding the barrel with the other hand and rotating it,but I wouldn't bother I
would recrown the barrel and find a suitable pellet

[TonyL]

but I wouldn't bother I
would recrown the barrel and find a suitable pellet

That might work. Along similar lines (ish), might it be easier to consider just adding some shallow rifling at the muzzle end (FX stylee) by introducing some type of mandrill and "cold forging" / pressing in a vice using collets?

[isobar]

Spinning a drill will just cause rings,you need a slow helix 1 in 16" is common ,you could do it by hand pushing a glass rod
with emery glued to it along the barrel whilst feeding the barrel with the other hand and rotating it,but I wouldn't bother I
would recrown the barrel and find a suitable pellet

silly me,this was the answer,hobby pellets came to the rescue again.the little rifle is shooting well with these without the ridiculous fliers.

some great ideas on this thread from a while a ago.