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Ridgerunner665":162dshge said:Gotta point something out here...
Eagleye said he wouldn't push the Ackley past its limit...then he turned around and did it with the 7mm Rem Mag...in the data he posted, it's loaded to 65,000 psi.... SAAMI limits the 7mm RM to 61,000 psi....that 4,000 psi evens out the difference some.
The 280 Ackley is SAAMI spec'd at 65,000 psi...
Thats why people can get VERY NEAR to 7mm RM performance from the Ackley...within 50 fps isn't unreasonable, nor is it dangerous...if approached carefully.
Load both to their SAAMI limit...and there is very little difference between them.
280 Ackley is essentially just a long 7mm Remington Short Action Ultra Mag....the case capacities are nearly identical, with the Ackley having 1-2 grains more capacity.
Not intending to start a disagreement...just pointing out a discrepancy.
Lots of people, including myself, looking for data and info on the Ackley these days...in the spirit of safe and accurate info, I thought I'd point it out.
Everyone wants to compare these rounds at equal pressure....but doing that, you handicap the Ackley.
Edited to add: The Ackley will equal the 7mm WSM, and in some cases, beat it....according to SAAMI, the Ackley will shoot 140 grain bullets a little faster than the WSM.
Case capacity isn't the only thing to consider here...you also have to consider how well a particular powder "fits" that case capacity....there are a great many rounds out there that have capacity to spare...but no currently available powder can make efficient use of that capacity.