Ok this is over max load in the manuals you will see offered today but most of them have been reduced by 10 - 15% of the charge weights 20 years ago due to liability issues.
I'd love to see your
scientific proof that the charge weights have been reduced for liability reasons. I doubt it could be because accurate measuring methods are now common and in use so the values are actually correct? Nor could it be because of different lots of powder over the years that vary slightly in energy and burn rates? Probably not due to different bullet profiles that have different bearing surfaces are used compared to previously used projectiles. Perhaps the latest test barrel has a different throat configuration than previous barrel? Hmmm, nah they probably just asked the corporate attourneys how to cover their butts.
OK. I deleted that line since I could not provide your
scientific proof as I don't have the manual for this load specifically, shame on me for making generalities discussing cartridge loads. I stand corrected. But really, rolling your eyes??
Have you shot it? Let me know what YOUR testing proves out.
Why do you think the older manuals show higher max's and speeds than they do today? All powders in general not just Hodgdon's.
Since the velocities were listed as higher also I seriously doubt the composition has changed much, again in general.
The biggest difference I see from the metal can days in most of the old Dupont lines that Hodgdon continues is less velocity at the same weights with the IMR line in general. Again in general.
SR4759 is considerably less energetic than the metal can days (proven).
I have to shoot more IMR 4831 than I used to just to reach the same speeds (proven in the same guns, bullets etc. no other change), this has been since the plastic bottle introduction.
So it reasons that some may be MORE energetic but I have NOT seen it with IMR's 4759, 4831, 4350 or 4895 so again::::::::::::::::
YES WORK YOUR WAY UP and watch for pressure signs as all disclaimers state.
The gun & chronograph will show you when you are approaching max if you will let it. Reading brass, primers, bolt lift etc has not changed.
I did not say any or all or old bullets. I said SGK and Interlock BTSP 100 grainers in the .243. I did not say something I used to do way back when.
This is from quite current shooting tests. The IMR vs "H" powder in this specific .243 load (general, more than a couple of guns) has shown me better accuracy and lower ES's at higher velocities.
In the 280 AI I just setup, the IMR 4831 gives better accuracy and speed than "H" version with 140AB's as well. Now the H4831 especially the short cut shoots very well in the 280 AI, just not as well for me as the IMR. And the H4831 shot solid .62 moa, but getting nearly 100fps more with same pressure indications at under .5 moa in a 27" Brux Rem Varmint profile barrel, only thing left with this gun is test in big temp swings to see if it is stable enough. Did not test this gun with the metal can version (so not proven).
This may be gun specific in this caliber as it is the only one I have tried it in, but in the .243 testing has been in several guns.
Attorney's most certainly assess and impact management of powder manufacturers liability risks.
But bottom line is no different than I stated the first post::::::::::::::
YES WORK YOUR WAY UP and watch for pressure signs as all disclaimers state.
Let us know what your testing proves out. I certainly would welcome any info or insight you offer, be it
scientific or just something you have that works good for you.
Very sorry for not being able to provide any proof as to why the load manuals have changed, guess it could be as simple as Hodgdon prefers to sell their named powder and just backed down the IMR line so their name powders appear to create more velocity, again I don't know.
I see very lil if any difference in temp sensitivity as claimed by the "H" line of powders. Never seen a powder that was not temp sensitive, they ALL are, some are just worse when not used in the correct application.
If you can't get to 46 grains in your .243 then you CAN'T, but not much lost to try it. Start down within the loading manual limits and work your way up to see.
I never see anything about "work your way down" til you find a safe load.