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Check this thread out where I did some testing with a 7.62x39 with various bullet diameters. In short with my .310 barreled CZ527 there is NO diffrencd in group sizes between shootin .308 and .311 diameter bullets.http://www.gunboards.com/forums/topic.asp?TOPIC_ID=151420I POSTED THIS PREVIOUSLY ELSEWHEREIt's been pretty hotly contested as to how much diffrence there is between loading 7.62x39 using .308 bullets vs .310-.311 so here it is. I tested this and here are the results.The rifle is a CZ527 carbine topped with a 3x9x40 redfield accutrac scope. The bore measures .300 land to land and .3105 in the groovesThe ammo was loaded with 150 gr Sierre soft points 10 rds of .308 and 10 rds of the same bullet sized .311. Cases were Remington CCI 400 , The powder was 23.5grs of Re-7 with a COL of 2.310It was about 65 degrees today with a light varible breeze of 15 mphShot string 1.308 bullets18511826185218271846***************Shot string 2.311 bullets19351904193719121925****************Shot string 3.311 bullets19531888 !?191519321925***************shot string 4.308 bullets18521855186918441873All velocities were taken at 25 feet.As you can see there is very little diffrence in group size. About the only real measurable diffrence in using the .308 dia bullets is that they are somewhat slower in the FPS department.Of course your mileage may vary.