Wanting to build a 7MM Practical using a Manson reamer for the job & this brass was recommended by Dave Manson himself. He's built his own & tells me that he's tried both Winchester brass & SIG & in his opinion he considers it far superior with far less bullet runout.
He stated that it's widely available in the US but I can't seem to find any supposedly Canadian SIG suppliers that stock it. In answer to your'e question, I'm UK based with an Ontario property Nr North Bay.
shona