I feel burn rate charts are nice information to see but otherwise useless, You need to look at the actual loading data over a number of sources and powders and see what is a "universal" choice.
Let me comment on "burn rate" charts. The purpose of advertising is to create ill informed consumers who make ill rational choices. As a measure of comparison, burn rate charts are so useless to as to be a comedic parody of reality.
Object in point:AA2700. Accurate Arms purchased one of those 90,000 lb WC 852 lots around 1991, repackaged it in kegs labeled as AA2700. I think the 2700 was chosen because the military used the powder to push a 150 grain bullet to 2700 fps in the Garand. Based on the burn rate chart, one would think it was inappropriate for use in the Garand, but not so. This powder has a quick enough pressure drop that port pressures are not excessive for the Garand gas system.
All we know about powders is blaring labels, “end of history” infomercials in the popular press, and some crude burn rate chart, which is about as useful as using a cubit rod to measure to the ten thousandths.
Our powders are blended against company specific pressure curves, and given that blending is only about 10% plus or minus, and that the mean can be shifted up or down, there is a mind boggling number of pressure curve averages that could be made from blending faster and slower lots of the same gunpowder. A pressure curve, a standardized pressure curve, would be far more useful to evaluate powders. And I am sure a pressure curve would show that differences by class, between the 150 plus powders out there, are in fact, extremely small, perhaps a percentage point or two. Published pressure curves would be very helpful in deciding which powder would be best for a particular application, which is why the shooting community will never see them.
I have to tell you, cheap chronographs just blew a huge hole in the hull of the Magumn hype ship. I can imagine the howling that went on within Marketing Departments when the velocity curtain was pulled back, revealing their carefully crafted lies were just illusions feeding delusions. Without chronographs, the shooting community had to believe the advertising hype of the latest and greatest super Magnum, or wonder Wildcat. Once chronographs came out, shooters found that bigger did yield more velocity, more muzzle blast, and lots more recoil, but the increased velocities were usually 200-300 fps less than claimed. And then the expense and bother of feeding and shooting a big boomer, which is only moderately faster than a standard cartridge, caused many to walk away.
Tell you, 70 grains of IMR4350 to push a 150 gr bullet to 3000 fps in a 300 Win Mag, will quickly empty a powder can .
Do note, claims of over the horizon shots and performance are made almost monthly in periodicals, but at best, the gun writer shoots at100 yards. They never actually test to see if the bullet is tumbling at the 1500 yard distances they claim for the bullet, and they never test expansion in ballistic gelatin at those distances. It used to be wet newspaper and wet phone books were the Gold Standards for expansions, but both free newspapers and phone books disappeared from the curb on trash day. What do you know, our experts just picked up the goal posts and moved them. Now the current Gold Standard for bullet expansion is water filled milk jugs, robbed from recycling bins on trash day! It is humorous to envision gun writers, trolling in the early mornings, furtively running to and from their vehicles, racing to collect as many free milk jugs from the recycle bin, before the garbage truck picks them up.