30x60 with 30 XCB and Federal 215 primers
30x60 with Federal215 primers
Iretested H414 and conducted a psi work up on SuperPerformance powder (SpP) inDawn, my 30x60 with a linotype cast 30 XCB bullet last Thursday.The H414 in the 30x60 demonstrated the same inefficientignition and burning as was evident in the .308W Palma rifle when tested.The primer used in both cartridges was theWLR.
Theinitial psi work up of SpP was done with my usual 3 shot initial tests.56 & 57 gr showed promise at 3000 fps +/-but still displayed a fairly high ES and SD both of velocity and of psi.It too was done with WLR primers.
Sinceboth those powders and LeveRevolution are ball powders of slow burning I suspectedthe use of a magnum primer might tighten those ES/SPs up so I loaded some testloads of H414, SpP and LeveRevolution powder using Federal 215 magnum primers. Iconducted the test of those loads this morning.I use the Oehler M43 PBL to measure the velocity and psi.What I found was interesting.The Federal 215 primers did indeed tighten upthe ES/SDs of both H414 and SpP powders.The use of the 215 primers provided no material affect withLeveRevolution powder.
Accuracywas very poor with the SpP powder.
Accuracywas more consistent with H414 but not acceptable (2 moa or less).
Accuracyremained consistent with LeveRevolution powder.
Solet’s see why by examining the data produced by the M43 of a load with eachpowder using the 215 magnum primers plus a test of my standard LvR load withWLR primers for comparison.Each of thetests shown was selected because they all showed a muzzle velocity of within 4fps of 2960 fps.The 10 shot groups aretraced on each data sheet.The bore ofDawn was cleaned for each powder test and 2 foulers were fired prior to recordtesting.
TheSpP load of 56 gr with the Federal 215 primer shows an excellent velocity SD of11 with an ES of 30 fps.The psi ran41,300 with and SD/ES of 400/1,500 which is also excellent. Note also the smooth and consistent pressuretraces. The same load over WLR primers gave a velocity SD/ES of 19/39 fps and apsi SD/ES of 2,400/4,900 for just the 3 shot test. The pressure traces alsoexhibited considerable erratic ignition characteristics.Thus we see the Federal 215 magnum primergreatly improved the ignition and burning of the SpP powder.
Attachment 136856