400 grain DGX, .410, Hornady item #4104, $50 per box plus shipping. These are soft point expanding bullets. I can ship up to 10 boxes in one flat rate box for $25. Perfect for your 450/400
Have 16 boxes to sell. Hornady discontinued selling these and they are becoming difficult to find. A 450/400 owner would be hard pressed to find a less expensive bullet to use, even for practice.