My COAL looks like the SAAMI Max of 3.340” for the unaltered M70 458 Winchester.
So my velocity hopes out of the 22” barrel, shall be lower than your lowest achievement. I will be satisfied with 2300 fps. Anything over 2300 more happy.
At 2300, based on a BC of .410, I should still be slightly about 1900 fps at 200 yds with minimal trajectory concern.
Idmay375, Your requirements are easy to meet, as I too have a Model 70 with 22" barrel. Using the Barnes 400gn X bullet (Still have a batch loaded up) and a load of 74gn of H 4198, I chronographed 2434fps over my Oehler 35P. OAL is 3.345" My back up load used 76gn of H322 for 2380fps so exceeding 2300fps in the 22" barrel length is a done deal.
Just to demonstrate how versatile the .458 is with heavier loads, I found a couple of decent loads for the Barnes 450gn TSX bullets using 72gn of H 322 for 2381fps ( OAL was 3.338") and 68gn of H 4198 which achieved 2360fps. (OAL 3.434") I never correct velocities to Muzzle Velocity and the 35P is set at 15 feet from the muzzle to eliminate muzzle blast on the screens. John
When truth is ignored, it does not change an untruth from remaining a lie.
