Hey John, thanks for your reply. I just went out and measured a few cases. Loaded rounds necks measure .2665”. Shot cases necks measure about .269”. Flat based Sierra 55Bk slip inside the fired cases easily. I tried to find my old load notes that contained a lot of my “pre level headed” load data but couldn’t locate it. But did look through my current (last 15 or so years worth) notes.
Hodgdon data 58vmax 49.7 H414=3925fps 24” barrel
My load. 58vmax 50.0 H414= 3958fps. 25” barrel
Hodgdon data for 55BT H4895 42=3656: 46.5=4066
My only chrono’d data I could find With 55BT with H4895 is 44.0
3930fps
Hodgdon 70 grain data with H414 44.0=3305: 49.0= 3693
My load w/70BK was H414 51.0=3750
I wish I could’ve found my original notes. These are all taken after a 1” barrel set back due to throat erosion. Then again maybe the old girl just ain’t as fast as I remembered. Powders I used back then were a lot of RL19 H380/414. I don’t remember the exact additional capacity the Ackley gains over the std cartridge but it seems to have been around 7-9%. Anyway, thanks again.
Ben
