2840fps in `06 w/ 180gr bullets (from Nov`10)
Sunny, 50degr, slight 10mph breeze
Rifle: Model 70 (new model)
Barrel: Medium/24"
Bullet: 180SMK
Case: WW (1st fire)
Primer CCI-BR2
OAL: 3.28" (10 thousandths off the lands by Stoney Point measurement)
Powder: Vihtavuori N560 (very useful w/ Hvy bullets in the 300Win)
`Ran QuickLoad calculations to find the best probable combo for highest velocity/least pressure (< 58,000) with both the SST and the SMK.
Nosler said it could be done with relative ease. The only question was "...who do you trust? "
Sierra, Lyman, Hornady, Hodgdon, and Speer manuals are all over the place.... `Back to QuickLoad so I could at least see what's happening as things ramped up. While RL22, IMR-7878SSC, H4350, all played to some varying degrees & compressions, QuickLoad said N560 had the edge.
‘Worked it up from a predicted 51,000psi load to that just over 58,000 -- and watching the velocities with the Oehler, a Starrett micrometer for the web/rim,
We get...
"Actual" is in blue, and is limited to three rounds as I figured I'd bump up against velocities and/or rim expansion/bolt lift that told me pressure was exceeding brass limits
`Never happened.