ipscjoe Im not going to say that isn't the correct OAL, but all I had to go on was some old ammo that I found that was loaded to 1.159 and Im going to guess it worked but It's been so long I cant confirm. Im thinking about trying 1.155 and if it varies to 1.159 I should be ok. Im letting my cousins son who is new shoot it so I was trying to figure it out. This should be a good one for him to start out with, it's set up with a comp and dot and one heck of a trigger job I had Henning do on it (which cost more than the gun is worth : ))