Counter to Coastal Naval with Gatling Guns

Lately been seeing an uptick of people playing coastal nay with ships such as the Pr. 206.
I can not find an effective counter to ships like this equipped with gatling guns, everytime I encounter one around BR 4.0 my ship will go from 100% to dead in under 3 seconds most of the time before my rounds even reach the enemy?

Is there any counter to these ships or is it just Soviet bias?

What gatling guns?

What vessel are you sailing?

Flank + depth charge. Works wonders.