This is indeed what Go is great for. But your code example is a bit wonky :) Specifically,

    for {
        select {
        case r := <-ch:
            // do something with r
        default:
            fmt.Printf(".")
            time.Sleep(5e7)
        }
    }

You're needlessly blocking 50ms on every iteration. (Side note: time.Sleep(50 * time.Millisecond) better captures your intent.) Better to reformulate that as

    for {
        select {
        case r := <-ch:
            // do something with r
        case <-time.After(50*time.Millisecond):
            fmt.Printf(".")
        }
    }

Or, if you don't need the dots in the output,

    for i := 0; i < cap(ch); i++ {
        r := <-ch
        // do something with r
    }