The following data was developed in a custom rifle built on the Remington 700 Safari action. We installed a Dan Lilja 25-inch stainless steel fluted barrel, with a 14-inch twist, and re-stocked it in a McMillan synthetic stock. The action was glass bedded using the Brownell’s Steel Bed.

We used the Winchester large rifle magnum primer in Winchester brass. All groups are 3 shots at 100 yards.

All loads with the 500-grain bullets were compressed – even the starting loads. Maximum charges were very heavily compressed. Obviously, this rifle does not like the 300-grain bullets!

We are planning to re-chamber this barrel for the 458 Lott and see what improvements we can get over the original 458 Winchester.