Can I travel to US on B1 if I have gotten my H1b stamped but it is not effective yet?

I have my H1b2016 petition approved, the start date on my form is October 1.

I currently hold a B1 and I am planning to go for H1b stamping in July. Can I travel to US before October on my B1?

I dont see any issue on travelling to US with B1 Visa even though you have valid H1B visa. Its completely depends on the requirement from your company to travel on which visa. generally you wont come across with any such issues. in worst case if any one raises, you can tell that, at the moment we didnt get the requirement to work on workpermit. so i am travelling on a business trip…like that.