The exact same increase in temperature also leads to the nitro cellulose based powder In the cartridge to burn up at a greater level, manufacturing roughly four instances the Point of Impression (POI) change than just air temperature by itself.
Many thanks for sharing these final results. Just like everything else from this web site it’s pretty interesting and practical!
Speer Bullets, Federal Premium and CCI. The catalog states: “The powder cost weights shown inside our information tables are maximum. For rifle and pistol masses, the utmost powder fees really should be lowered by ten % to ascertain a minimum amount or starting up powder cost.”
So I might think about they seemed and tried difficult to find Yet another area to make it and arrived up vacant. As a result, they'd to discontinue it. It's a disgrace.
Loading density is perfect for magnums, nicely filling the situation at utmost prices, contributing to wonderful uniformity and accuracy. The 7mm Remington Magnum “by no means experienced it so superior”!
I thought it absolutely was an excellent posting. They went to some great length (like leasing a freezer truck) to test to get it ideal. That makes it far more disheartening which the article is lacking the charts and images. It seems like an individual copy-and-pasted it in from another source and the pictures weren’t integrated.
Hello. I come across all your posts IMR 7977 really usuful and applicable. Is it possible to give us a much better indication of how the Magneto Velocity chronograph measured up on the doppler radar?
We purchase bullets from firms that concentrate on this process. Moreover, we often extensively inspect pulled bullets to be sure They are really in
I could well be very beneficial to know the ES and SDEV of the rounds with Every single of the different powders. The tester basically used the exact same powder pounds for all four powders and even though it wasn't said, I'd personally assumed they were not centered on an accuracy node in all four circumstances.
I realize there are a few style of recoil calculators, that may estimate recoil force and speed (I think), but I in no way performed all-around with a person to determine if it’s truly in a very magnitude assortment to induce a variance, also they don’t choose recoil administration and muzzle units into IMR 7977 consideration.
Whether or not which was mainly because of the temperature improve or Jim's capturing, we are unable to say. Regardless of the cause, from a hunter's viewpoint, accuracy was effectively unchanged.
The objective of the test was to quantify the temperature balance of your 4 powders we’re interested in. To accomplish this we’re going to evaluate the muzzle velocities of load ammo for a wide range of temperatures. Let me immediately run throughout the set up of how the check was executed.
As opposed to point out “ten shot teams can exactly explain the particular distribution of photographs” condition From 10 shot groups along with a recognised or assumed Commonly imr 7977 in stock likelihood distribution one can calculate a superb estimate in the indicate with the team.
Small Intense velocity spreads are merely as crucial to be a powder’s ability to make even velocity about a variety of temperatures.