Using R22 64 grains and 140 grain BT in Nosler brass and WLR primer at 3390 from 26" tube. Hart Barrel
Interesting...a 280AI juggernauting 140's at STW and Mashburn velocities;and from the same length barrel that Nosler says gives,at best,100 fps less velocity.
And people wonder why I think 280AI users are the biggest wishful thinkers on the planet,and greatest purveyors of dis-informatiion.
Any fool can keep adding a double based propellant like R22 until the chronograph screams,just to make a cartridge look good.
That's as humerous as quoting Quick Loads as evidence of pressure in your rifle....another joke of the uninitiated.
I use Quickload and a Labradar to develop loads. The QL program does indicate pressure , is this indication spot on......I doubt it, but it is not too far off either.
With accurate recorded velocities and correct inputs to the program you can find a node in as little as 5 shots (this is to establish burn rate of your particular lot of powder) then another 5 for a tiny group. Quick load needs to be studied and all inputs need to be accurate.
My 280ai runs on a node with a 162 ELD-X at around 2800ft/s, indicated pressure is around 60K, five shot groups at 100 yards are inside 1/2 inch.
Velocity is the result of the correct powder for application within excepted pressure and on a node.........velocity is of little concern but accuracy is.
