QuoteI hear you.

Well I for one am impressed.  I'm a newcomer to the 10mm but a longtime .44 Mag fan.

The standard factory 240 gr .44 load was long catalogued at @1250 and about 750fpe...and usually out of at least a 6 inch revolver which is considerably longer than even a 6" semi-auto.  And fatter.  And heavier.  And holds 6 rounds.  And was reputed to break your hand. 

That a 30 oz factory semi-auto is in the same league at all powerwise indicates that we've come a long ways.  Of course revolvers have not stood still either so we have "super magnums" which fill the role that the .44 used to.

I can't see a lot of room for advancement in power past the .500 S&W but there is likely something left on the table for semi-autos.  A durable, packable factory .460 Rowland...   A high-pressure .50 counterpart to it...  I suppose the ultimate would be something like the .50AE (limited by grip size) in a duty sized gun.  All that's required is for someone to engineer it and enough others to figure out that they "need" such a gun.

New guy here with a new G40.  My first Glock and first 10mm.  Only about 20 rounds now but it is perfect so far.

Starline brass is in the mail but I got some Fed AE 180 FMJ to get the feel and loaded up some Power Pistol/XTP loads using a buddy's unneeded once fired brass.  I was a little surprised at the muzzle rise with the "lite" AE ammo and a little apprehensive about the hotter handloads, but the 155gr XTPs felt extremely mild.     I'll have to Chrony those next time, but by the data they should be about 700fpe.   Brass showed no trauma, although the CCI-300 standard primers did "muffin top" a bit.

50ft groups were about 1-1/2" average (1-1/4" best) with the Fed and irons.

2 co-workers have G20 Gen4s and I believe they have been flawless as well.  I was torn between G20 and G40 but on the day I went lookin', a G40 was the only Glock 10mm in the store.  No complaints so far.