Wound’t magnetospeed readings be typically a bit highter, since it steps the relative velocity among exiting bullet and recoiling rifle, and never the relative pace between bullet and “earth”?
The influence of temperature on barrel and bullet diameters could well be an interaction impact involving rifle and ammunition.
Putting Rounds on Concentrate on by Bryan Litz – This online video particularly can help you know how to create correct dope cards. Bryan offers a pretty well-rounded intro to ballistics and very long-assortment capturing Within this training. I’ve viewed it numerous situations.
In contrast, instances that don't have a belt headspace to the shoulder and possess a Significantly tighter fit in a chamber. Winchester Supreme .270 Winchester cartridges calculated only .003 inch shorter from the case head experience towards the datum line about the shoulder compared to fired Winchester cartridges.
Teams were not recorded as I had been seeking to have the shots off as my timer went off right away to make sure that a “hot chamber” or “this, that, and the opposite” didn't mess up the results. Thanks, Patrick
You're definitely obtaining fine velocity and precision. I'd agree that there's minimal motive to jettison what you might have for your newer powder.
A quick Take note on a remark you designed about H4350 and Varget. The rifle used had a 22″ barrel which is why the velocities with Varget have been larger than that with H4350. Varget has the exceptional burn off price for that barrel size. H4350 is better with 24-26″ barrel lengths mainly because it is somewhat slower and is consequently a far better powder for that more time barrel.
Did I overlook any observation on imr 7977 in stock how temperature impacted the SD of the muzzle velocities? That may be, for a given powder was the SD from the muzzle velocities the same within the temperatures on the experiment?
Exciting Take a look at. Something I seen is that Regardless that IMR4166 didn’t had the smallest muzzle velocity per diploma fahrenheit variance, It appears to own quite possibly the most liniar properties.
Jim applied a Caldwell Hearth Handle entrance rest and rear bag when taking pictures for precision. We identified no substantial change in accuracy amongst shooting at forty three-levels F and shooting at ninety seven-degrees File. The impact factors on our targets have been a bit better, nevertheless it wasn't statistically substantial.
Truthfully, you absolutely sure is likely to be correct with regards to the MagnetoSpeed remaining far more precise. It’s blind faith In either case, since I can’t truly visualize An easily affordable solution to determine it out. If I had access to a complete-blown, Skilled doppler setup Or perhaps a commerical Oehler product like what Sierra or another person works by using, you could probably determine it out.
I think I will keep on with my 66.forty grain IMR 7828SSC load and plug the temperature variances into the Applied Ballistics application. That load is providing my a little above 2900 fps and sub MOA teams. I guess that falls under the "if it ain't broke Will not fix it" class.
Wow. Thank you so much for sharing some imr enduron powders data on one other powders. That actually allows place these leads to context from the bigger picture. Which’s attention-grabbing with regard to the N140. I suppose that corroborates what I found relevant to the adjust in muzzle velocity not becoming linear with temperature change. I agree you shouldn’t just just take the average.
Moreover, for every one of the tree huggers in the world, there isn't any elements regarded damaging towards the surroundings. Unless, naturally, you concentrate on blowing A imr enduron powders 3 inch gap via a trophy bull elk at two hundred yards unsafe.