Wound’t magnetospeed readings be generally a bit highter, because it steps the relative velocity between exiting bullet and recoiling rifle, and never the relative velocity in between bullet and “earth”?
I don’t Assume I recorded any temperatures previously mentioned about a hundred and eighty levels F. Is that this documented in any peer-reviewed put you can position to? You’re a pointy person, but I constantly consider to deliver 3rd get together assist in my posts (like Within this one particular I referenced Litz as well as analysis on Kestrel’s Internet site). Where can I study more details on the barrel’s purpose Within this?
Something you might discover while in the chart previously mentioned would be that the variation in velocity does NOT seem like properly linear over the total variety of temperatures. By that, I indicate the improve for each degree from 20 to sixty five may be smaller or bigger compared to the alter per diploma from sixty five to one hundred forty. That may be shocking, nevertheless it’s some thing I’ve read a pair marketplace execs notice at the same time. That’s why I’d suggest you check your very own masses at numerous temperatures, and document what you find.
The excellent news is often a shooting buddy has a new LabRadar And that i own a MagnetoSpeed and we are going to discover for ourselves this weekend. Once again thank-you the perform that you just do.
The Kestrel Elite Climate Meter with Used Ballistics means that you can enter a desk of muzzle velocities for various temperatures, and it'll mechanically use that info to infer your Original muzzle velocity for The existing ailments. That is a quite cool element, and in terms of I understand it’s the only real ballistics motor that gives a method to instantly account for this sort of variable. Nonetheless it’s only useful if you have superior info to assistance it.
This is my 1st submit IMR 7977 in this article on This great site. I'm an avid Hunter, shooter, and reloader. I've been reloading given that about 13 a long time outdated and am not forty seven. Will not assert to realize it all but I sense pretty at ease with loading ammo.
But way too the article, did you fellas shoot the ammo while they were still in their temperature extremes, or let them settle all the way down to ambient?
The leading attributes from the Enduron collection are copper fouling eliminator, insensitivity to temperature variations, perfect loading density and becoming eco-friendly.
That's just what exactly we had been looking to do in this article, and I couldn’t concur a lot more. I imr enduron powders do speculate how Those people more recent powders would do, but I assume I’m skeptical in Alliant’s quality at this point. But, it’d be interesting to find out the info!
If you are doing primers, try Sellier & Bellot primers (no less than IMR 7977 LR). A friend turned me on to them, and so they took my SD down from very low teenagers to very low one digits in six.five Creedmoor. They're cheep and they seem to operate – i’ll have a lot more data after capturing them by the rest of the 12 months.
No matter whether which was because of the temperature modify or Jim's capturing, we are not able to say. Whatever the bring about, from the hunter's point of view, accuracy was basically unchanged.
That’s an incredible query, Kasper! Within the barrel check I performed not too long ago, I measured chamber temperatures about a twenty spherical fast-hearth string (all fired within just one moment) in addition to a fifty spherical slow-fire string (fired above twenty minutes). The temperatures I recorded weren’t as significant as you may think they might happen to be. Even over the rapid-fire check, the very best chamber temperature I found was 149° F. Now semi-automatics would very likely get Substantially bigger, but this was all done for bolt-motion rifles and twenty rounds for each minute is a reasonably brief rate of fire.
Such as, a 223 55gr FMJ. We frequently have two or 3 kinds of this bullets available. Regardless that the leading description is similar, Every Variation has a bit various profile and
You didn’t cover the affliction on the rifle throughout these checks. Although the powder may very well be at a certain temperature as it’s positioned into the feed ramp, it’s rather difficult to forecast what the temperature with the load will likely be all through the moment of firing – esp. if it’s been sitting in the chamber for more than a few seconds – brass will conduct most up-to-date warmth quickly.