yoh azns. Rule of thumb from lurking through the pages a heck of a long time and actually had a B&S on me for my very first time.
If it's 100/45...i'm sorry bro it's an auntie (40~). If it's 120/45, it's also an auntie.
If it's 140/45...probs some where in the mid 30s. If it's 160/45, that...