Only 85 posts, but even the "new guy" gets it... There's a lot in the following ruling that is open to interpretation. I'm not saying this would happen, just that it shouldn't be excluded as a possibility...
2. Magazines designed or manufactured for both centrefire calibre rifles and handguns
Magazines designed to contain centrefire cartridges and designed or manufactured for use in a semiautomatic rifle are limited to five cartridges. However, magazines designed to contain centrefire cartridges and designed or manufactured for use in a semiautomatic handgun are limited to 10 cartridges. Magazines designed or manufactured for use in both semiautomatic rifles and semiautomatic handguns are subject to the limit of five cartridges.
Example:
Hi-Point rifle and handgun chambered for 9mm Luger caliber:
• magazine capacities over five rounds are prohibited.
again, the mags would have to be MANUFACTURED as fitting both, that part of the law does not apply to specifically manufactured pistol mags at all, it only applies to those manufactured as fitting both
any danger of this happening to a 50 beowulf pistol mag could also happen with lar-10 mags,
they are both covered under the exact same law,
so its not stirring the legal hornets nest any more then the lar 10 mags, and 5/10 beowulf mags already are
the law, AS IT APPLIES IN THIS CASE, is as follows
4. Magazines designed for one firearm but used in a different firearm
The maximum permitted capacity of a magazine is determined by the kind of firearm it is designed or manufactured for use in and not the kind of firearm it might actually be used in. As a consequence, the maximum permitted capacity remains the same regardless of which firearm it might be used in.
Example:
The Marlin model 45 (Camp Carbine) rifle chambered for 45 Auto caliber uses magazines designed and manufactured for the Colt 1911 handgun, therefore the seven round and eight round capacities are permitted. A similar example is the 10 round capacity magazine for the Rock River Arms LAR-15 pistol, regardless of the kind of firearm it is actually used in.
5. Magazines for semiautomatic handguns which contain more than ten (10) rounds of a different calibre
Magazines designed to contain centrefire cartridges and designed or manufactured for use in a semiautomatic handgun, are limited to 10 cartridges. The capacity is measured by the kind of cartridge the magazine was designed to contain. In some cases the magazine will be capable of containing more than 10 rounds of a different caliber; however that is not relevant in the determination of the maximum permitted capacity.
Example:
Heckler and Koch P7 pistol chambered for 9mm Luger caliber:
The magazine designed for the 40 S&W calibre variant of the pistol will hold 13 cartridges of 9mm Luger calibre and function in the 9mm Luger calibre P7 pistol. This is permissible as the maximum permitted capacity of the 40 S&W calibre magazine must be measured by the number of 40 S&W calibre cartridges it is capable of holding, which is 10 such cartridges in the case of the HK P7 pistol magazine.
lar-10 mags would be in the exact same boat, there is no difference, whatsoever between putting 10 round lar-10 mags, or "13" round lar-10/7.62mm mags, or 18 round /5/10 .50 beowulf mags at all, the law has already been established
antis would be, (and are) just as pissed we got 10 rounds,
so breathe easy, we dont need to appease the antis, this law is actually on our side here,
you can support 10 round beowulf pistol mags without undue cause for hand wringing