Some VERY interesting BCs, esp. for the LR guys.
I believe Sierra did make a 155 MKHP long ago, but they never found alot of favor and ultimately may have been dropped.
Wonder if there may be parallels for the 6.5/155 combo vs. a 270/180. No doubt a QT is needed to spin a long bearing surfaced 277 slug, and that will induce more drag - in bore, and affect pressure curve.
Speeds possible in a WCF? Guessing 2600-2650 in typical 24" bbl.
Years back Speer made a 180 grain round nose 270 bullets. Wildcat Bullets makes a 190 grain, but the 270 win doesn't have the powder capacity to drive them fast enough, but the RUM case does
I may be wrong, but Speer made a 170 grain RN in 270, not a 180...
I have a 170 RN listed in a couple of old Speer Reload Manuals from the 60s, when they list the bullet as new...
I also have half a box of them given to me by someone who said he would never use them...they are somewhere around here...
