I got some of the 80gr JLK porjies on the weekend and here is a pic of how they look like next to a 80gr amax. The JLK looks to need a longer throat to keep the same case capacity as the 80amax.
![Image](http://i173.photobucket.com/albums/w76/Seddo45/Gun%20Pics/223-amax_vs_jlk_zpsf9ca64e5.jpg)
My chamber was cut with a 223 Wydle chamber by Rod and i dont know what the throat length it but i my opinion it isnt long enough for the JLK's. I have a 7 twist 223 being put together in a few months (Keith is out of the country) that will be throated for the 90gr projies so i think i will keep the 80gr JLK's until then unless someone thinks it will still be fine with a reduced powder charge? I am running ADI brass and gettign the 80gr amax to 2900fps in a 26" barrel.