Montana Golds are very good and super accurate, I use them in major competition matches, although they are not available here in canada, All the one I have are from winning them at prize tables.
The canadian BDX brand is almost an exact copy (if you can get them also)
AS an alternative I did a bench test with my STI Edge in .40S&W and found that Frontier were the closest in terms of accuracy to the Montana gold and are way cheaper and easier to get.