Reloading .303 British : 30-303 Sizing Die

In response to your lead off, I just have to ask this question lawndart. Why even own an Enfield rifle to begin with then? Makes no sense to come to a forum dedicated to the rifle that shoots a .311" projectile and start a thread stating that you are allergic to same said projectile? Instead of attempting to convert a 303 to any other caliber, it would probably be in your best interest to buy an Enfield already chambered in the caliber you desire. Cheaper that way actually after all the money you would have to invest in parts to get everything correctly fitted. If it is a 7.62x51mm chambered Enfield you desire, look for the 2A, 2A1, DCRA conversion, L39A1,  or L42A1. If you're lucky enough you might even find some chap in Australia wanting to let go of his Enfield chambered in 25-303...