That’s great, William. I hope this Site conjures up Other individuals to accomplish related exams. The set up was fairly straight-forward. You just will need reliable ammo and a good way to measure muzzle velocity, so which the powder is the sole variable. Best of luck for you!
I have already been using H4831SC in my seven mag with terrific success. There normally seems to be some around the shelf and it's a flexible powder.
Freezing a bullet shrinks it considerably. Heating it that A great deal expands it significantly also. Despite having friction Heating through the barrel the force concerning The 2 would be drastically different. A “fatter” bullet experiencing the same barrel to be a “skinnier” bullet is obviously gonna shift at distinctive speeds… Powder asside.
The excellent news is actually a shooting buddy has a fresh LabRadar and I have a MagnetoSpeed and we are going to determine for ourselves this weekend. Again thank-you the get the job done which you do.
In addition they are formulated for being temperature insensitive, comparable to what we’ve noticed with Hodgdon’s Intense series of powders.
And it's difficult to find. Quite hard to find. I actually went on Gunbroker.com before I released this to test to discover if there was any available, due to the fact I figured this put up could exasperate the challenge far more.
For his pistol it absolutely was about 3.five% and for and Vaughn’s 270 Winchester rifle, it was about a further three%. Presumably a modify in barrel size would influence the amount. The radar trace confirmed the velocity increase after which start the normal drop thanks to tug extremely Plainly. My assumption is this publish-muzzle acceleration would idiot a Magnetospeed into reading a little bit small, given that the bullet would not be rather performed accelerating when it crossed the very first imr enduron powders sensor. I study someplace the Army found muzzle blast affect in artillery to become performed in the very first 11 calibers outside of the muzzle, but don’t remember Discovering the barrel size(s) in calibers or peak-to-muzzle pressure ratios imr 7977 in stock they discovered it for.
Did I overlook any observation on how temperature afflicted the SD from the muzzle velocities? That's, for the supplied powder was the SD of the muzzle velocities the same on the temperatures on the experiment?
Not less than with the powders tested the variation with the muzzle velocity SD with temperature was just a few fps. So not variable for most, if not all purposes. Often very good to show a potential variable into a continuing. Fully have an understanding of your methodology didn't allow taking pictures for precision.
So it's possible a appealing option for These that actually suitable for temperature, but don’t have a tool as refined as the outlined Kestrel Elite meter. Liniarity is often woth a thing I guess.
1 fps or 0.01 fps? Wouldn't it alter the team precision at a hundred yards in any way? Would it not change the SD from the muzzle velocity in any respect? Go to the assortment by using a given rifle, ammunition, sighting system and System and ascertain the group precision at 100 yards, suggest muzzle velocity and muzzle velocity SD for just a specified ambient temperature. Then all unique outcomes for example result of temperature on powder and any impact due to thermal expansion or change in Actual physical Houses are “provided” within your measurements. This is actually the common engineering tactic but degree pf applicability of results to other rifle-ammo-sight-System techniques is most likely little known at best.
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The answer is easy, the IMR Enduron powders characteristic a inbuilt copper fouling eliminator, are insensitive to temperature extremes and therefore are made up of tiny sized grains for easy metering and specific loading density.
Very low Extraordinary velocity spreads are merely as significant for a powder’s ability to make even velocity about a wide array of temperatures.