Thread: 577 Super Snider build and chamber reamer size

I got my two 577 Snider Bertram cases from @Fssprecision today and compared them with my own made cases formed from Magtech 24 gauge brass

Very happy with the comparative sizes

As I expected the Bertram rim is 0.35mm larger diameter
Magtech rim is 0.15mm thicker which is a surprise
Case base is 0.1mm smaller on the Magtech and this was probably not touched by my dies
All other dimensions are very close

Now I just need some kind forum members to submit their fired and sized cases to increase the data set before I draw up the final reamer dimensions and cut into my huge diameter piece of tool steel
Something fired and sized from the more common Lee dies would be great