Assuming you resized the cases… they have lost their ability to stay sized and the necks have sprung back after sizing. You need to anneal the necks to allow them to be properly sized.
I rented my gauges when I rebarreled my 6mm Remington
Think my total cost was $27. Easy peasy...
https://www.reamerrentals.com/SearchResults.asp?Cat=141
I’ve got 48 rounds of primed 270 Win brass for sale. It has been reloaded previously, but is in very good condition. Need $25 shipped. USPS money order or cash at your risk.
CCI 41 for small rifle and 34 for large rifle are designed for semi auto use to prevent slam fires. They are harder, but function as designed in my experience.