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Are either of those your on duty caliber?
is it worth the weight and size trade off?
I think so. Dimentionally their not that far off. Their both high recoil guns. I'm not a big .40 or G27 fan . Snappy as heck. I've found the .45 to have the same or less recoil & more accurate over all.
Their both more than adequate calibers for the job. I'd say go with which ever one you find the most manageable.
Neither gun is really in the same size class. I own a G26 (same size as the 27) and a G30SF. the 30SF is an order of magnitude larger. Both are pretty easy to conceal, though. I carry one or the other on a regular basis. So it's really a matter of what you want. I would say if you are getting the 30, get the 30SF unless you have oven mitts for hands. That 2mm or whatever it is actually makes a big difference.
-Mike
For us it made a difference on whether we were buying our own ammo to qualify with a backup/off-duty pistol......
How does the 21SF compare to the 30SF? I was looking to get a hi capacity 45 and considering the 21SF.
With out getting into a caliber debate, I would say see if you can shoot both, and make your choice based on what is easier for you to shoot.
I carry a G29 and I prefer it because it is a larger gun, it is easier for me to shoot then my buddies G26, I do have big hands though. I have no problem concealing it with a C-TAC IWB holster, and a 15 round mag in a Bianchi single mag pouch that looks like a leatherman pouch.