Examine This Report on IMR 7977

Hey, Clay. That’s a giant concern to attempt to address within the responses, Which is the reason it took me a couple of days to compose a reaction. I’ll try to assist as much as I can. If I were just getting started, I’d target considerably less on gear (outside of a able rifle set up like you have already got) and a lot more about your basic marksmanship and idea of lengthy-selection taking pictures and ideal practices on employing your long array rifle.

Thanks for sharing these effects. As with almost everything else from this blog it’s really intriguing and practical!

Freezing a bullet shrinks it noticeably. Heating it that Considerably expands it substantially also. Despite having friction Heating with the barrel the pressure among The 2 will be significantly various. A “fatter” bullet under-going precisely the same barrel for a “skinnier” bullet is obviously about to move at distinctive speeds… Powder asside.

I'd Consider in most scenarios the temperature of your ammunition is the same at that on the rifle and scope.

I agree that a load that makes the most beneficial SD’s doesn’t automatically indicate it'll produce the top teams, and vice versa. I feel a single is more related to case style, powder, and inner ballistics, and the opposite is connected to barrel harmonics and finding that “precision node.” In prolonged-range taking pictures, I place extra excess weight on small SD’s and excellent team size (desire below 1/two MOA), more than Tremendous-tiny team sizing and higher SD’s. (Actually, Using the Prometheus having low SD’s is very easy with most powders.

I started off at 58gr and worked as many as 60gr. Was IMR 7977 not guaranteed the flat based Partition would deliver much more pressure as opposed to Hornady bullet so I ended there.

Yeah, Rick it looks like we predict quite a bit alike! I do shoot at temperatures which have been diverse than I zeroed, Despite the fact that IMR 7977 I Verify my zero pretty commonly … so I guess that limitations that to a point. I typically shoot at fifty five-ninety five degrees ninety% of some time, but After i’m looking that would be as little as ten levels or at a summer season-time match, I would shoot in temps as large as a hundred and five.

A modify in temperature can have an affect on the trajectory or ‘flight route’ with the bullet in two very well-regarded approaches:

So I loaded some 270WIN with IMR 7977 determined by a conservative H1000 charge and took them out and shot them.

It's probably that no further dialogue is necessary, by which situation we suggest setting up a fresh thread. If nonetheless you are feeling your reaction is needed you are able to even now do this.

I’m unsure if there can be major variation with much larger magnums or not. It’s a fascinating issue. Because it’s rigidly connected to your firearm, it’s plausible.

Another ten loaded rounds from Each and every team ended up brought up to 140° File by exposing them to your heating blanket. This may possibly sound abnormal, but if you leave your box of ammo out while in the Solar or about the sprint of your respective truck … it can get around this temperature.

With that being explained, these new powders imr 7977 in stock are all the things Hodgdon promises them being. Mention being unaffected by temperature, we were surprised. Check out the tabular success beneath for yourselves.

I am able to only think General Dynamics (who helps make the actual powder) can not hold which makes it for them. I am aware they utilized to make loads of powder for Hodgdon and after they were awarded an enormous defense contract they informed Hodgdon they'd only be capable of preserve generating the Enduron powders available to them.