I bought a 6.5x284 copper and with factory ammo before and after shot you could not hardly open the bolt . I took it back to the place I bought it because they're guaranteed and what they told me I will not repeat. I have had two rifles built by Harley at Insite Arms so I dropped it of and said fix it . He called me and said the chamber was way to small I do not no how this passed QC but if the pics work you will see before and after . I have a 6XC and a 338 LAPUA built by him and WOW do they shoot!