Have new and once fired 30-40 Krag Winchester brass and 38-55 once fired.I'm trying to figure an honest price. I can't find any new or once fired available on the internet?

Midway lists both new (out of stock) but will give you an idea as far $s go. BACO probably lists both also.

When I don't have an idea on pricing I check the completed sales on gunbroker.com

https://www.gunbroker.com/All/...9&View=2&Timeframe=1

https://www.gunbroker.com/All/...9&View=2&Timeframe=1

Star Line sells .38-55 brass check their prices to get a ball park figure.

Grafs probably lists .30-40 brass but maybe not in stock. Again they will give you a ball park figure.