use imperial sizing die wax inside the necks with a Qtip and same wax on the outside .
I have used and sized steel 45acp cases no issues..but carbide dies..
Make sure the steel is very clean inside and out and there should be no extra stress on the dies.
If you fired this steel from your gun..maybe a neck sizing will be sufficient.
Some steel wool size 0000 on a bore brush will clean inside of necks really well if there is carbon stuck inside them.
If there is carbon outside the cases..remove all that before sending them into a die...
0000 wool will work on outside also ...if tumbling does not get it all....And blow all the steel wool off the case..
I am now saving all my 270 brass i pick up..convert it to 30-06 or .243..or .308 as i have those but do not have a 270.
Yes i am hording all my brass..