These types of powders labored properly with A selection of 7mm bullet weights, while just one was limited to just one pounds bullet.
IMR 7828 SSC is often a magnum rifle powder with the exact same burn level as standard IMR 7828 and utilizes the identical knowledge. On the other hand, as a result of Tremendous quick kernels, metering is just about pretty much as good as being a spherical powder.
I opened up the Applied Ballistics Analytics software, and ran the figures. I utilized the six.5×forty seven Lapua muzzle velocities for your Berger 140gr Hybrid from our examination, and also utilized the Custom made Drag Curves for that bullet (which in my expertise make the predicted ballistics align VERY intently to the actual-globe benefits). I’m unsure what focus on length you shoot at, but we’ll presume an excellent one thousand yards to essentially make any variations in muzzle velocity get noticed. Listed below are the final results:
They haven't taken them off their Web-site and possess no point out of them remaining discontinued on web site? Where you listen to this? I googled it and only point that arrives up Is that this write-up?
Groups were not recorded as I had been hoping to get the pictures off as my timer went off promptly to ensure a “very hot chamber” or “this, that, and another” did not mess up the outcome. Thanks, Patrick
I loaded each circumstance at what I realized might be a delicate to medium load, so that you can avoid stress spikes. Not one of the masses have been “tuned” for the specific rifle we had been tests with.
A quick Notice on the comment you created about H4350 and Varget. The rifle utilized had a 22″ barrel and this is why the velocities with Varget ended up bigger than that with H4350. Varget has the optimal melt away rate for that barrel length. H4350 is best with 24-26″ barrel lengths as it is a little slower and is also consequently a better powder with the for a longer period barrel.
IMR not too long ago unveiled a different line of powders “with Enduron Technology,” which is also marketed IMR 7977 to obtain “Extraordinary temperature stability.” … Sounds common! These new powders should contend immediately Using the Hodgdon Extraordinary Sequence, which supplies shooters much more powder options to take into consideration.
This test was executed by Patrick Middlebrook. Patrick is keen about the IMR 7977 artwork of precision rifles. He’s an incredible shooter that has competed in a lot of area matches, and several nationwide PRS matches. He is additionally a 5-star handloader. I’ve figured out a ton from him!
I'm sure there are numerous form of recoil calculators, that might compute recoil pressure and pace (I believe), but I in no way played all around with one to find out if it’s essentially inside a magnitude assortment to induce a variation, also they don’t consider recoil administration and muzzle devices into account.
Cal, I deeply appreciate the work that you choose to do. I wished to weigh in to the LabRadar and MagnetoSpeed conversation. In terms of accuracy I might feel that the MagnetoSpeed is the more precise evaluate of the Velocity with the bullet because it exits the barrel.
So, this take a look at definitely does deliver all the things you would like for a solution. At this point, you’ve got me wondering myself … so Enable’s stroll through it. Enable’s say it’s 65° F the working day on the match, and in one state of affairs You simply near the bolt on a spherical for about a next before you decide to mail the shot … so there is basically no heat transfer towards the powder. In Yet another scenario, you loaded the spherical in a really warm chamber plus the powder was heated to 140° File. To answer your dilemma about could it wreck imr 7977 in stock any potential for a success, let’s presume you happen to be using among the lesser carrying out powders In this particular test, IMR 4451.
So I loaded some 270WIN with IMR 7977 based on a conservative H1000 cost and took them out and shot them.
You wager! I just acquired an annealer, and seriously wish I might have read through it right before I produced that acquire. Maintain out guy! Glad the timing labored out better in your case than for me!