Pellet Sizers?

[les allam]

Two slightly different uses,
older BSA .25 calibre was actually .243" so a sizer is needed to take a 6.35mm pellet down to around 6.2mm to fit the barrels.
or
just to slightly finesse a *.53 pellet down to *.52, *.51 etc just gain accuracy from better conformity.

I have a U.K Neil sizer made for my bsa Lightning in .25 cal.
Once the Hn ftt pellets were sized it made loading easier, and improved power by 1.5fp.
A great bit of kit and nicely made.
Les..