I tried it with my 8" under Alpine Skies but could not see the globular.

Under rural skies with 16", I could hardly see a very faint patch of light without any granulation or other details/structures.

sketch: 16", 51x, NELM 6m6
Pal4.jpg
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With 27" under Alpine skies the observation remains difficult. The 1' small glow was certainly a direct vision object but was again very faint. Increasing the power to 419x shows a 16mag star at the western border. Even if 2-3 stars a popping in and out of view I did not see a granulation or mottling structure.

See my Palomar Cluster side for detailed description.