Thread: The Importance of Using the Right Data

Greetings All,
The weather today is all warm and horrible in Hawkes Bay and the white flag was run up on splitting firewood early on. I thought it might be interesting to look at the variations in load data for H4831/ AR2213SC to see if it had become faster, slower or stayed the same over the 70 plus years it had been available. Yes tragic I know but that is how my mind works. I drew on data form O'Connor, John Barsness, Ken Waters, Terry Wieland and the Hodgdon on line data. To stop sending everyone who has not flicked to another thread to sleep I'll keep it brief.
The original post war surplus No 4831 and the new manufacture H4831 about 1972 to 1995 is pretty close in speed and performance. John Barsness chronographed loads for WW2 surplus No 4831 in 2015 which agreed with those from the 1960's.The later H4831, H4831SC and AR2213SC manufactured by ADI is slightly slower. One of O'Connor's loads, 60 grains of No 4831 with 130 grain partition in Win case, chronographed and pressure tested by Remington produced 51,200 CUP in the 1960's. Current Hodgdon data for 60 grains of ADI H4831 with 130 grain Hornady Spire point produced 51,000 CUP in the mid 1990,s. Velocity was a little less with the latter. IMR4831 is a lot faster.
It is interesting that a powder that is 70 plus years old and on it's third manufacturer has changed so little. A lot of the newer powders have not done as well.
Regards Grandpamac.