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Do you have access to a chrony and a scale?
While you cannot completely determine the pressure of the rounds without a strain gauge, if you know the weight of the bullet and the muzzle velocity, you could tell if it is running hot. A close examination of a few fired cases would help.
My suspicion is that it is, in fact SMG ammo, and was made in 1981 before being surplused out. A lot of it appears to have been sold several years back, and I do not recall a big complaint of blown 9mm pistols at that time.
The 228 is a strong pistol, but has an alloy frame. I would try it out in the heaviest all steel pistol that I had access to.
Just my .02, YMMV.
TR
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"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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