Do NOT try this at home. The OH6A or H500 is a very capable aircraft. It does have a very wide flight envelope and benefits from being very clean aerodynamically. It is possible for instance to roll off the power at cruise from about 10' off the ground perform a cyclic climb, turn left at the top, and continue turning through 360 degrees and land, engine off. I have demonstrated autorotations where at the lower RRPM limits and higher airspeed, you can fly the rest of a circuit from 1000' downwind, including all the square corners that would put some fixed wings to shame. The OH6/500 with all the doors removed is still cleaner than a clean B206. Also a lean OH6/500 is not much heavier empty than a 300C. It does also benefit in being a little more crashworthy than others of a similar generation - up to a point.
I wouldn't be surprised if the manouvre you describe was feasible, although it would be difficult too demonstrate without breaking something.
A power ON cyclic climb from 50 knots in a H500 produces a lot more performance than you would expect.