It's not so much that long loaded ammo will be unsafe in your standard SAAMI firearms.. it's that they will not work in magazines and will not fit in the chambers of said SAAMI firearms.. they are not neccesarily unsafe..
If you took a Glock 20 with it's long 10 mm magazines, dropped in a 40 S&W barrel into it, you can now load those bullets longer to fit said magazines and as long as the leade in the barrel accomodates the longer bullet, it would then be safe to fire in that Glock. Since most G34's and 35's (orother standard guns made by Glock, Sig S&W, or whoever) are fitted with the shorter magazines, they MUST load shorter to accomodate the SAAMI length chamber/magazine combo..
It is correct that since you need seat the bullets deeper, you can't always use the same powder charge (it might not fit without compressiong the load). And compressed loads that are not book loads (anything that IMO is given on the internet not by a powder or bullet manufacturer) is to be approached with caution.
If you took a Glock 20 with it's long 10 mm magazines, dropped in a 40 S&W barrel into it, you can now load those bullets longer to fit said magazines and as long as the leade in the barrel accomodates the longer bullet, it would then be safe to fire in that Glock. Since most G34's and 35's (orother standard guns made by Glock, Sig S&W, or whoever) are fitted with the shorter magazines, they MUST load shorter to accomodate the SAAMI length chamber/magazine combo..
It is correct that since you need seat the bullets deeper, you can't always use the same powder charge (it might not fit without compressiong the load). And compressed loads that are not book loads (anything that IMO is given on the internet not by a powder or bullet manufacturer) is to be approached with caution.


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