Molasses wrote:Editted to add: I am entirely too slow at typing.
Countryfried Frank wrote:Several reasons. One of the biggies is that with a larger bullet it sits deeper in the case effectively reducing your case volume and consequently raising pressures. A lower charge is then necessary to keep pressure safe. I'm sure you'll get more in depth info but this is the one that sticks in my head most easily.
rugersol wrote:Countryfried Frank wrote:Several reasons. One of the biggies is that with a larger bullet it sits deeper in the case effectively reducing your case volume and consequently raising pressures. A lower charge is then necessary to keep pressure safe. I'm sure you'll get more in depth info but this is the one that sticks in my head most easily.
Yep!
... the ways I think of 'em is ...
1. dia. of the bullet, can't be changed ... and, fer the most part, OAL of the cartridge, can't be extended ... at which, with a heavier bullet, there's only way fer that extra mass to go ... into the case!
2. at some point, ya simply can't squeeze more than a certain amount of powder into a case ... as well as, a bullet ... seated to proper OAL ... moreover, with some quicker powders, ya don't even wan't 'em touching!
3. "power-factor" and ft/lbs are two measurements of "power" ... fer the most part, as ya increase bullet weight, ya must decrease velocity (powder charge) to decrease ft/lbs ... and, as ya do, ya'll most likely see "power-factor" increase ... if ya do not, yer truly making a "less powerful" load ... at which, in a semi-auto, at some point, it won't cycle the slide (w/o a lighter recoil spring, anyhow)
4. relative to #3, as ya decrease bullet weight, ya gotta increase velocity (powder charge), to maintain "power" to cycle the slide
5. if ya are truly making less powerful loads ... IOW, ya don't increase powder charge relative to decreasing bullet weight, with some slower powders, ya 'sposedly run the risk of a "detonation"!
If ya go thru all them a few times, ya realize there's somewhat of a "balance" of bullet-weight, powder-charge, and powder burn-rate, that must be maintained!
To the extent ya don't, ya risk bad things!
There are some instances where, as ya increase bullet-weight, powder-charge is either the same, or even goes up a skosh! This is not typical! When ya see such a published load, cross-check it with AT LEAST two other sources! ... not a bad way to go for ANY load ya find!
Put 'nother way, if ya don't have a published load fer a lighter bullet, don't simply guess as to how much powder ya should add ... ya may not need to add any!
Fer the most part, if ya want a heavier bullet to reach the target as quickly, ya'll need a larger case!
sgruenhagen44 wrote:rugersol wrote:fer the most part, OAL of the cartridge, can't be extended
If OAL can't be extended then should you always shoot for the minimum? Because I forget how long my cartridges are but they are not the minimum either.
rugersol wrote:sgruenhagen44 wrote:rugersol wrote:fer the most part, OAL of the cartridge, can't be extended
If OAL can't be extended then should you always shoot for the minimum? Because I forget how long my cartridges are but they are not the minimum either.
There's obviously a min/max. ... if not a magazine, the "throat" will dictate max. OAL ... regardless, whatever that might be ... it can't be extended!
Sammichman wrote:I think i understand,,the powder charge has to have a certain amount of room to expand and create energy,,to much room and the energy is to spread out and doesn,t burn effeciently ,,,interesting stuff seems like engine Compression
Sammichman wrote:Thanks Sam ,,I,ll just take it slow and ask a lot of questions,,Great thing about you guys lots of Help without being talked down to
Sammichman wrote:Thanks Sam ,,I,ll just take it slow and ask a lot of questions,,Great thing about you guys lots of Help without being talked down to
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