Thread: Sticky bolt after second shot

I'm hoping you guys can enlighten me on a issue I had at the range yesterday.

I was sighting in my 300WSM with 200gr ELDX Hornady Precision Hunter and noticed that with a cold bore the rifle or a rifle that had rested 5mins(ish) between shots it functioned as expected and the spent cartridge was easy to extract. If however there was a round followed in close succession or there was a string of shots fired, then the bolt got sticky and there were pressure signs on the brass (bolt face extractor slot was visible on those cases).

This is the first time I've come across this before (I don't reload, and every other rifle I've used .223, .308 and 7mm-08 have all eaten up factory ammo no problem at all). If the ammo does not cause a sticky/stiff bolt of when the rifle is cold, but does when the chamber or rifle is warming up, what does that mean/indicate?

FYI The rifle (Kimber Montana 8400 WSM) is not new, but new to me. I understand that the rifle had fired approximately 200 rounds from new from the previous owner. As I only had one brand of ammo to try out I could not compare another brand to see if the same problem exists.

I'm guessing the factory rounds may be too hot for the rifle, but keen to hear if I've missed something. I did run a bore-snake down before shooting and periodically through the range session. Could a fouled bore/carbon deposits cause the increase in pressure?