Yeah, this definitely demonstrates why H4350 is sooooooo preferred Amongst the best shooters. I use a bunch of it myself in my 6XC and six.
I then made use of the Prometheus Gen II Powder Scale to toss all charges. I've checked the Prometheus several situations over a superior-conclude Sartorius analytical scale, and every time it confirms what I currently know: the Prometheus is exact all the way down to only one kernel of powder! The Prometheus isn’t low-priced (starts all-around $3,800), but in case you reload approximately I do, it could save a huge amount of time, and allows me to Visit the variety rather than sitting around loading all day.
Possibly major question is what number of shots for getting great figures. Developing the 100yd precision is an additional subject. Standard knowledge claims once Possess a precise group centering It is just a piece of cake. I'm not so particular but may just be my ignorance. A detailed description of your methodology to determine 100yd precision with pictures might be a boon to me. Next finest can be your suggestion of references. Several, a lot of thanks for that time and effort to perform the experiments and comment on my and various posts.
In contrast, scenarios that don't have a belt headspace to the shoulder and have a Significantly tighter slot in a chamber. Winchester Supreme .270 Winchester cartridges measured only .003 inch shorter from the case head deal with to the datum line to the shoulder compared to fired Winchester cartridges.
Many thanks for sharing your views, since I hadn’t even considered the value of getting a linear relationship. It’s an interesting see.
I utilize the Strelok app as my ballistic calculator and it has powder temperature input, but I don’t know very well what it’s adjustment element is or if it might be manually set to your 0.21 fps/F which you calculated. I’ll investigate it and see if I'm able to refine the calculations for greater predictions.
But way too the posting, did you men shoot the ammo whilst they have been nevertheless in their temperature extremes, or let them settle right down to ambient?
It’s amusing how a matter like which can provide to mild a number of the primary assumptions we make! I’ve surely thought about that 1 a lot because I initially heard him propose it.
Fascinating Exam. One thing I seen is always that even though IMR4166 didn’t had the smallest muzzle velocity for each diploma fahrenheit variance, it seems to have essentially the most liniar qualities.
Exciting factors … but I’m acquiring velocities of 2840 IMR 7977 fps with 130 Hybrids using H4350 in my 22″ six.5 Creedmoor. You will find Completely no indications of stress. I’m not the guy who pushes to receive eek out that very last bit of muzzle velocity that has a “sizzling” load. That imr 7977 in stock appears to not align with the idea, but there are such a lot of factors that Enjoy into it (such as the person barrel characteristics) that it’d be difficult to attract conclusions from tiny sample dimensions.
An outstanding lengthy-range class is like that. Those people instructors can assist jumpstart you into this world and skip several years of Studying things that tricky way. No matter your present-day degree … I assure you’ll discover a good deal. I know I nevertheless study a great deal from these instruction occasions. I hope to acquire An additional one particular in 2017, and could possibly continue to consider one particular a 12 months for good.
Sorry for not reading your write-up more cautiously. Your feedback, because the Brits would say, are spot on. For my own data sets I generate a histogram As well as calculating the suggest and SD. Histograms enhance error bars. We are all grateful to Cal and his colleagues for the time, exertion and money to expend in doing cautious experimentation.
I’ve listened to shooters obtaining twenty loadings on 6.five×forty seven brass (if annealed). Being able to reuse it that repeatedly could imply Lapua is The most cost effective brass You should buy! I employed brand new Lapua brass and expanded the entire necks by using a Sinclair Expander Mandrel to make sure the necks ended up in line with no dents. Neck rigidity is commonly missed, but If you need reliable single digit SD’s (i.e. your ammo has incredibly steady muzzle velocities, with typical deviations of under ten fps), you’ll require reliable neck tension.
Len Levi: I've experienced for imr enduron powders a long time your Lee common cast breech lock press #90998.I have often experienced truble with...