SS.
The point is not that the loads are unsafe otherwise they would not publish them.
CUP is an outdated way of calling the shots. It is neither convertible to the established SAAMI mode nor to the metric BAR convention.
All SAAMI Pmax pressures for any given cartridge manufactured are in PSI. This rating is the first thing you should look at when loading a cartridge like the 270 is Pmax MAP 62366 (4300bar) so you can start with 15% less at 53kpsi. Go and look it up on the new Hodgdon data. A metric shooter using BAR can easy convert to Pmax PSI.
We are talking about convention. We are not driving model T-Fords anymore neither. Or are we still using hands and stones for measurements.
I know for a fact right here on this forum people don't know the difference between PSI and CUP, like you mentioned the 57000 CUP in some manual, this is nuts, to say the least. No it is not a safe load.
And ah, who accepts responsibility when somebody blows up his gun because he does not know the difference between CUP and PSI. I really think Hodgdon should be very ashamed for the printing of this data.
Fortunately I am not dependant with this data, and have no need to use it. As a matter fact I never use loading books data thanks to QL.
I hate to break this to ya Fred...But...All of the SAMMI loads aren't shown in PSI...and many of them are in CUP
as they were tested...Hodgdons knows full well what they are doing...and have absolutely nothing to be ashamed about...People have been following reloading manuals to the letter and only on rare occasion have they had any serious problems...BTW...the SAMMI rating for the 270 Winchester is 65,000 PSI...it is one of the cartridges that have been listed in both PSI and Cup...and a 57.000 cup load for the 270 is perfectly within specs if this is what you are alluding to...so give your quick load program a rest...I figured you would have remembered what happened before with mitchell's 204 load you claimed was unsafe...Most powder manufactures list CUP as a way of showing what the pressures are..because they don't want to try to re certify them with SAMMI...They are converting them when they can...Also... if folks follow the guidelines set forth in the manuals...providing the gun is chambered within specs..they won't have a problem....BTW...just how many certified blow ups can you site here for us because someone didn't know the difference between CUP & PSI...?...You just keep on using your quick load program.....I have no need for something that gives this type of erroneous information...I much prefer talking to the techs at the powder/bullet companies if I have a question and getting the correct data.
Bigjeepman..
What is hard to understand at times is the minimum/maximum load difference between manuals and powder companies. For example:
What is difficult to understand...? They all don't swap the same pressure test equipment between themselves...so they are using different barrels..different lots of powder/primers/bullets...and the environmental conditions are different too....Read what they say...
It is safe in the barrel they tested it in...The problem is people need to learn to read the instruction before starting...and stop
assuming the max load is safe in their rifle.....That's what all those instructions are for that are printed in those manuals.....This is the reason we always tell folks about our reloading data..it may be safe in mine..but not yours...Everyone should reduce the powder charges..and use the same components as what is listed...and should definitely reduce the powder charge if they are changing
any component...This is where many people get into trouble...This or when folks try to do a short cut..and load it up to the max listing to get the max velocity out of it...The reloading manuals are a guideline to those components used in a SAMMI spec'd chamber...nothing more...sometimes one can go above what is listed in their rifle due to all of the variables I have said...sometimes they can't get even close...It is up to the individual to use safe re loading techniques...and to check their loads...They and they alone are the ones to make sure they are doing it correctly...not the powder/bullet manufactures...
Mac