I broke down and ordered a Scherer 28rd mag for my G21. The only reason I say 28rds is because of the "witness" holes numbered 3-28. I wonder if Tony Scherer is to cheap to change the mold so that it list the correct number or if they just don't know. Most places that I see advertise them as 25rd. The overall finish of the mag comes up a little short. I think they could have spent a little more time on it so cosmeticly the mag could be cleaner looking.
I loaded mine with 27rds before the follower bottomed out in the +2 base pad. I think I might have got the 28th rd in if I crushed the spring & follower in the bottom but for 1rd why take the chance of messing something up. I found that if you help push the nose of the bullet down with your thumb at the same you push the Glock loader down, it seams to make loading easer. Still stuffing 27rds of 45ACP in this mag is a chore. I did not have much time at the range so I only got to load the mag twice and the second time was with 22-23rds.
First mag = 27rds
Rapid fire right out of the gate, I figured if I did not have much time I was going to make the mag work a little.
Result = At about 20-21rds I had a malfunction. It might have been shooter induced because at about 17-18rds the other shooters were starting to talk and complain about the spray of 45 brass(LOL). I guess it was my way of saying - "Welcome to the Indoor Range"
Second Mag = 23rds
Rapid fire again. No malfunctions!
Slide locked open on the last rd both trips to the line.
I know it's not enough testing to get those with G21s to pull out the $45 yet. I will update this post the next trip to the range, hopefully I will have a little more time to test some other ammo besides WWB.