I am a commercial caster serving a small but very quality demanding bunch of customers. Right now I am using a Mountain Mold belonging to a customer. It is stamped MM279-85. It casts a 270 Cal bullet of 280 dia as cast x 90 grains in 6% antimonial alloy. My customers shoot it in the 270 Rensing single shot pistol. The mold is beautifully made, functions flawlessly, and casts equally beautiful bullets. That's just by way of background. I have two questions :
1. With this mould I cast 300 bullets per hour over long sessions of several hours. Your XL block will easily accept three cavities. That would increase my output to 450 per hour. That's important in commercial casting. Yes, I know you have said no four cavity, and I can understand that because your XL block is not long enough. But it is plenty long enough for three. Will you do it ?
2. I have encountered huge problems with 44 Mag mass produced moulds, RCBS etc. They overheat even at alloy temp of only 600, because the web of metal between the cavities is too thin. The frosting at that side of the bullet is so excessive that it doesn't fill out. The answer is a single cavity mold, which means painfully slow casting. Or a double cavity mould with the cavities spaced 25 or 30mm apart, centre to centre. Your XL block will do that easily. Will you do it ?