One of my shooting buddies and i were discussing the future build of his 7mm Ultramag LR Deer rifle, when the topic of the cartridges generous freebore and posible loss of accuracy when using bullets around the 140-150grn range came up. The rifle will be built on a custom action so in order to use lighter bullets the idea of a shorter freebore chamber was aired. A little research revealed that a chamber cut with a freebore of half that of the cartridges original .400" dimension can result dangerously high pressure spikes, obviously something we want to avoid. The problem over here in the UK is that we must by law use game style bullets with reliable expansion on deer, and bullets in the lighter weights are most readily available. The whole idea behind the project and the cartridge choice is to deliver hard hitting, accurate flat shooting projectile reliable onto the vital areas at long range with quick immobilizing kills. What we dont want to loose is either velocity from using heavy bullets, or accuracy from the more suitable and favoured lighter bullets, which clearly would suit a shorter freebore. It would be hugley appreciated if any of you guys out there who are shooting light bullets satisfactorily through your standard 7mm Ultramag and those who may have gone down the route of a shorter freebore, could share their experiences. Many thanks in anticipation. Ian.