Loaded a test with 80 gr 223 Sierra t what they say 2.550 Tested one with out powder or primer no crimp in my model 12. Came out way under. 2.470 2.475 So I cant load these to the sierra spec's. Any one else have this? What did you load to? Don't want to created pressure by changing the oal but no other choice. Just worried if this is going to work out.