Wound’t magnetospeed readings be usually a little highter, because it actions the relative speed concerning exiting bullet and recoiling rifle, instead of the relative velocity between bullet and “earth”?
As a practical matter do you frequently shoot at temperatures distinctive from temperature at which you zeroed the scope? And is the temperature with the ammunition diverse from that in the rifle and scope?
Freezing a bullet shrinks it substantially. Heating it that Considerably expands it drastically also. Despite friction Heating with the barrel the stress between the two can be noticeably distinct. A “fatter” bullet experiencing the same barrel as being a “skinnier” bullet is obviously going to move at distinctive speeds… Powder asside.
And Cal offers the outcome excellently at his ideal technical stage. If I had been to create a recommendation, it would be to determine an archive containing the full description of your experiments and the outcomes. Then everyone wishing to delve further, like their unique statistical Investigation, could accomplish that. Maybe if ample persons contributed Cal could hire somebody to do the archiving.
Many thanks for sharing your feelings, mainly because I hadn’t even considered the value of getting a linear romance. It’s a fascinating check out.
I attempted to track down the post While using the charts and pics but no good results. The posting appeared on another website but also with neither charts nor shots. With any luck , anyone will discover them. Granted the methodology in general was excellent the inescapable conclusion is zero and in the rifle-scope process founded at at supplied temperature, say ambient, will transform with temperatures faraway from ambient although the ammunition is at the ambient temperature at time of shot.
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The Enduron powders are mentioned to imr enduron powders offer optimum load density, resulting in low SD figures for tension and velocity, which need to subsequently, supply superior precision.
Ha! There is another examination I could possibly have to go out and shoot at some point. This can be certainly a rabbit hole! The more questions you are attempting to reply, the greater questions you discover. But it surely’s lots of pleasurable. It appears like we’re however inside the steam motor times of All of this, and we’re our Finding out is simply accelerating. It’s a fun ride for being on at this special place in record.
Should you Definitely can’t do a category, you'll be able to master several of the same issues from DVD schooling … but it surely isn’t In the vicinity of as powerful. Here are some you may perhaps contemplate in the event you had to resort into the DVD alternative:
That is a fantastic position, Martin! I hadn’t thought of that, however , you’re absolutely right. You can find some value to the powder Have got a predictable, linear alter in muzzle velocity.
That’s a great question, Kasper! In the barrel exam I conducted a short while ago, I calculated chamber temperatures more than a twenty round fast-fire string (all fired within just 1 moment) and a 50 round sluggish-hearth string (fired around 20 minutes). The temperatures I recorded weren’t as high as you may think they might have already been. Even on the speedy-fireplace check, the very best chamber temperature I discovered imr enduron powders was 149° File. Now semi-automatics would very likely get much better, but this was all carried out for bolt-motion rifles and twenty rounds for every minute is a fairly rapid rate of fire.
So I loaded some 270WIN with IMR 7977 depending on a conservative H1000 demand and took them out and shot them.
Excellent post. I was heading to alter to IMR 4451 from H4340 for greater temperature stability. Not now just after looking at your write-up.