Every single shot had 45 seconds of relaxation before the up coming just one. Pictures have been fired straight away when they strike the chamber. Pretty much as speedy as I could pull induce.
I then utilized the Prometheus Gen II Powder Scale to toss all fees. I have checked the Prometheus numerous periods on the substantial-conclude Sartorius analytical scale, and each time it confirms what I already know: the Prometheus is accurate down to one kernel of powder! The Prometheus isn’t cheap (starts off about $3,800), but when you reload approximately I do, it can preserve a huge amount of time, and lets me to Visit the range rather than sitting close to loading all day.
Sorry I did not mean to imply there is a thing Erroneous with IMR 7977. I am only stating be careful determining a starting off load for it and don't foundation your starting load on H1000.
And Cal offers the results excellently at his desired technical stage. If I ended up to make a suggestion, It will be to determine an archive that contains the complete description in the experiments and the effects. Then everyone wishing to delve further, such as their particular statistical Evaluation, could accomplish that. Probably if more than enough men and women contributed Cal could use another person to carry out the archiving.
From from “Precision and Precision For Very long Vary Capturing”/ p 86. “Ir’s not unusual for rifles to hit distinctive POI dependant on the velocity on the load resulting from harmonics, which can be unpredictable” But no comment on magnitude on the result to be a operate of temperature.
Most of our fired array brass is obtained from personal, public and law enforcement ranges. It really is then sorted and cleaned in our warehouse.
I've done various searches listed here seeking information on the 150gr Partition and IMR 7977 and came up empty. I made a decision to perform a little experimenting by myself and go based upon what Hodgdon had stated.
Many thanks, R700. Appears like as good of an explanation as I’ve listened to. Surely suits my encounter. IMR 7977 On a aspect Notice, I do use H4350 in my 22″ six.5 Creedmoor and I love the outcomes I’m acquiring. But I don’t doubt that I would manage to squeeze a little bit more muzzle velocity from Yet another powder. I do know a lot of men chase that past minimal little bit of muzzle velocity, but Those people twenty five or 50 fps bumps have almost no effect on hit chance With regards to extensive selection targets.
2grain charges . Conversely the brass they use is entirely worked in excess of and downselected ,they may use only ten scenarios from a 100case box and run a similar 10 conditions until the barrel is toast.
So perhaps a intriguing option for Individuals that actually right for temperature, but don’t have a device as imr 7977 in stock advanced because the stated Kestrel Elite meter. Liniarity is often woth some thing I guess.
1 fps or 0.01 fps? Would it not alter the team precision at one hundred yards in any respect? Would it not alter the SD from the muzzle velocity in the least? Go to the array by using a given rifle, ammunition, sighting system imr 7977 in stock and platform and establish the team precision at a hundred yards, indicate muzzle velocity and muzzle velocity SD for your presented ambient temperature. Then all personal consequences for instance outcome of temperature on powder and any result as a result of thermal enlargement or adjust in physical Houses are “integrated” in the measurements. This can be the traditional engineering tactic but degree pf applicability of effects to other rifle-ammo-sight-platform methods might be little regarded at very best.
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I find all this stuff fairly irritating – so I make an effort to make use of the least temperature sensitive powders as a matter obviously – given that I'm going from taking pictures in snow to capturing in blazing heat (and When the ammo is inside the sun for more than one min, who is familiar with what temperature it can be Within the case – unquestionably much more than 140F).
I am able to only think Typical Dynamics (who will make the particular powder) can no more hold which makes it for them. I realize they used to make lots of powder for Hodgdon and when they ended up awarded a large defense contract they explained to Hodgdon they'd only manage to retain generating the Enduron powders available to them.