Ithaca model 49 high velocity ammo manuals#

45 ACP ammo is loaded to a maximum pressure of 23,000 psi compared to 21,000 psi for standard loads. They are not, as some shooters believe, loaded to borderline pressures. I feel we in the industry should make an effort to demystify +P loads. Thus they are not offered to the general public. These loads are carefully tailored for modern service handguns and may not be safe in all firearms. This designates that the cartridge is loaded above SAAMI specs for +P ammo, and most manufacturers restrict sale of these loads to law enforcement, for good reason. I would be remiss not to discuss another P rating: +P+. Loads beyond this power level are not only more prone to jam, the added recoil causes more stress on the frame. These short-barreled variants of the 1911 are sometimes finicky, and a recoil spring tensioned for a particular power level of ammo helps to ensure complete reliability. The concern is the increased slide velocity produced by the hotter ammo, which affects the functional reliability of the handgun. All modern 1911s in proper working order will safely handle +P pressures. This is not due to any concern over chamber pressures. 45 ACP ammo is not recommended for use in short-barreled models. For example, some manufacturers of 1911s state, without explanation, that +P.

Ithaca model 49 high velocity ammo manuals#

Some manufacturers make vague statements in their owner's manuals regarding +P ammo that I feel adds to consumers' confusion. Perhaps the careless use of the +P designation contributes to the caution on the part of some firearms manufacturers. Be aware, all comments in this article regarding the safety of using +P ammunition are related to SAAMI-sanctioned +P loads only. Either the ammo is loaded to higher pressures than SAAMI deems safe or the +P designation is just marketing hype.

Since SAAMI does not specify +P ratings for these cartridges there are only two possible explanations. All the major American ammo manufacturers are SAAMI members, and most smaller outfits also abide by SAAMI guidelines, but I have seen ammo from one or two small manufacturers offered in calibers such as.