Re: 300 RUM with tight chamber help Needed
You clearly have a headspace issue. I would take it to a smith and have it checked. He MAY be able to run a finish reamer through it and correct it, or he may elect to set it back, and rechamber. Firing that rifle like it is, is potentially dangerous due to pressure spikes, and not enough head room. At first, I thought you had a die problem, but when you said factory ammo wouldn't chamber, then I began thinking headspace. When in doubt, check it out!!!!!