Thanks D. I appreciate it! [Beer]
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I realize that this thread is a month old but didn't see you getting the information you need. 6.8 and .270 are the same diameter but the 6.8 chamber will probably not work with those bullets, the largest generally used are 130 grain and mostly 85 to 110. The only 140 that I know people are using regularly in a 6.8 are Berger bullets. You want a SPC II chamber with 1/11 or 1/12 twist. More information than you will ever need is available on 68forums. Nice folk, many are in the business but still take time to answer questions. Some of those who developed the SPC II chamber and rifling that allowed higher pressure loads to be used are on that forum and share their knowledge freely. I have a Mini14 6.8 and AR15 6.8. They are great guns and much more flexible in use than the 5.56. You can't hunt deer with a 22 caliber bullet. However, ammunition is expensive and used brass almost impossible to find. I would take all I could get. SSA is the best supplier of 6.8 ammo. Good luck.
Won't .270 bullets work in 6.8 brass? Just watch the overall length..... Also, if you're pushing the bullet too far into the case, watch for signs of over pressure.