I have a pile of bullets I cast a long time ago for an Enfield I had that had a fat groove diameter to it . The bullets themselve unsized are .319" but the "new" Lithgow number one I have has a barrel that suggests .314" would be better . After lube sizing and gas check seating I got a bullet about .3145" and wanted to use 2400 to get it going about sixteen hundred feet per second or so .
Apparently this rifle doesn't like the taste of 2400 so I tried some Reloder seven I have . Accuracy with that didn't happen untill twenty-five grains of the stuff was in the case . I didn't chronograph the stuff but it sure feels like way more than sixteen hundred .
So I went back to the notes from the olf "fat" barrel that said twelve and a half grains of Unique was very accurate . so I tried that . Accurate it is but today a friend had his chronograph over and the loads clock at 1460 or so .
Alright , not what I started out for but I am easy to please
Jack