Issue with 300 WSM brass in a Tikka T3 light.

[quarterman]

I have had this issue be fore with wsm and wssm cartridges, You case is just not resized quite right, so here is what you do. Take a once fired case that you havent tried to resize yet. Burn a piece of masking tap( which will be very sootty) and get the soot from the smoke all over the neck shoulder and first half of the case body. Back off you sizer die a few turns and run the case through the die. adjust the die a small amount and run the case through the die again and repeat untill you can see where the die contacts the top of the shoulder. There should be a solid mark all the way around the top of the shoulder once the die contacts it. Try to chamber the piece of brass. If it is still tight or your bolt wont close adjust the die down 1/8 of a turn and it should chamber freely.