Has anyone altered a plastic ammo box. Looking to extend the lid upwards by 1/4”. Trying to store long 338 Lapua rounds. They fit in my 50 round box, but this one was for inside my gun case. I also have the MTM J-20-LLD, but the case only goes 3/4 of the way down. The LLD is made so the bullet tips are stored down. Probably end up using those and not closing them all the way.