
We, all, know that GLOCK uses a modified Browning lockup; however, when it comes to shooting reloads there is more to consider than, just, the usual manufacturer's warning against using this money saving ammo.
GLOCK barrels are manufactured according to the usual modified Browning design with two additional modifications: All calibers have mandrel-formed rifling. There is a much sharper chamber edge on GLOCK barrels that can catch and hold bullet trimmings (especially lead) every time the pistol is fired.
Some calibers have hexagonal rifling and others have octagonal; consequently, in comparison to button rifling, chamber pressures tend to be on the high side; and reloaders need to remember this whenever they attempt to reach the top of the charts.
Finally, the GLOCK system uses something called a, 'less supported' chamber mouth. This design does accommodate a wider variety of bullet designs; but it, also, leaves a percentage more of the case head exposed than other more conventional Browning, barrel lock-up designs.
IMHO, Go ahead and reload. Just remember to stay farther away from the top of the charts than you, otherwise, might. To my mind the bullet that hits hard enough, has the lowest flash, and the least recoil - THAT - is the right round to use.
Personally, I've never had much use for, '+ anything' loads. If I hit well with a particular round and the target falls down, then fine, that's the best round for my gun. I'd rather re:capture a sight-picture a little more quickly, and get a second round off, than go, 'KA-BOOM' and be awed by the shot. :wink: