Originally Posted by ajhardle
We're not talking about 100 fps here. It's a difference of 500fps. They are using different rifles,a 22" and 26", but that's not 500fps. I doubt there is that much variation in different batches of h335.I wonder if it's a misprint. Can anyone tell me what Hornady's 8th edition lists for 223 with 55 gr and h335?
Years ago all load data was tested in a 28'' test barrel and was fairly accurate.
Now it is calculated on computer programs and input data varies a great deal.
Most loading manuals are very conservative and if you start at minimum loads you will be safe
and can start increasing the powder charge in 1/2 grain increments until you start showing signs
Different chambers and barrels can effect the velocity so they stay under the max loads.
Also some manufactures enhance the data to make there product look better. A chronograph
will tell you what you highest velocity is at the max pressure. (Real world data).
J E CUSTOM