hi musty, got my swarovski Z5 with ballistic turrets, 5-25x52, for long range its absolutely amazing, i zeroed my remington 700 custom with the help of the software from the website. although inspite of putting in details of my factory load i still had to add a few more clicks to what the ballistic calculator showed me on the website, the first one is zeroed at 100, 2nd at 300, 3rd turrets set to 400 and 4th turret set to 500. then i use the software to tell me how many more clicks for 600 and 7-- yrds which i just write on the sticker provided and stick it inside the flip cover.
I would totally recommend the BT. it works liek magic and takes the guess work out in long range shooting.