I use a bar just about every time I dig. But I only use it once or twice a season to actually find the tube, I hate to pierce the tube with the bar.
I rarely use a receiver, although they are handy on the big big places when theres only 2 or 3 pairs of ears.
The bar in the photo is about 5 foot long, I use it for the deep spots, its too heavy to go walking far with along with the other tools. I have another slightly shorter but thinner which I take everywhere.
When you say 0.3 on a dig... IMO I would be using the spade not the bar, or get on all fours and have a listen. Unless yo