Anyone tinkered with the 40 Super?  I've been thinking about getting a 6" .45 to 40 Super conversion barrel from Lone Wolf for my G21.  From what I've read, double stack mags don't feed properly, so you have to buy 10 rounders.  Brass is readily available from Starline, albeit it's a bit steep. 

Why not just go with the 10mm, without the 10 round limitation and expensive brass?

Either way, if using a 21 slide, you'll want to use a good muzzle brake to slow down the slide with heavy loads.

There was a guy on the Glocktalk forum, can't remember the name, who spent a long time messing with the 40 Super, trying to get it to work. IIRC, he eventually gave up because he couldn't beat 10mm ballistics without functioning issues.

Interesting.  The book data shows it should have the 10mm by 150 to 200 fps.  Of course if function reduces your gun to a single shot, that doesn't mean much.

Also, people already have (sometimes legitimate) concerns that the 10mm over drives .400" bullets on the market today.  That is going to be even more legitimate in the 40 super.

If lightening velocity are the goal, the 9X25 might be a better option since it is reported to function very well and like the 40 super is a solid member of the "800" club.

I can see 40 Super for anyone who doesn't already own something in 10mm Auto.  But if one has something in 10mm Auto already, there's little if anything to gain outside of some sort of bragging rights or what have you.  There's 400 Corbon too, but again... 

400 Corbon falls a little shy of the 10mm in ballistics, usually about 150 fps.  Puts it right between the 40 S&W and 10mm Auto.

In general the big advantages of the 10mm over both the 40 Super and 400 Corbon are straight walls and magazine capacity.  With either of the 45 based approaches you loose 3 rounds or more in the mag.  That means whatever energy the 10mm falls behind per shot, it makes back up per magazine 

Add to it that the 10mm can be found at your BGS, whereas I have never seen 400 Corbon or 40 Super on the hoof, and the 10mm is the clear winner of the race, in my mind.

Quote from: sqlbullet on November 14 2012 07:37:53 AM MST
400 Corbon falls a little shy of the 10mm in ballistics, usually about 150 fps.  Puts it right between the 40 S&W and 10mm Auto.

True.  But there is that group of folks out there that don't believe in pushing the bullets any faster than the 400 Corbon does anyway while still wanting a bit more than 40S&W has to offer, and if they already have a 45 platform that they can simply swap a conversion barrel (for 400 Corbon) into over buying a whole new platform (for 10mm Auto) it might be in their best interest to them.

Otherwise, yeah, I'm with ya on everything you said.

yep...Kinda like us guys that get 9X25 barrels for our 10mm's.

Thanks for the responses guys.  I already have a 9x25 conversion barrel for my G20LS.

I guess I was just thinking out loud and wanted everyone to talk me off the ledge.  I guess the reason I thought of it is that I am absolutely enamored with bottle necked/necked down rounds.

Quote from: Danimal on November 15 2012 01:08:54 PM MST
I guess the reason I thought of it is that I am absolutely enamored with bottle necked/necked down rounds.

Certainly nothing wrong with that notion.  Besides, the bottle-necked counterparts should only increase feed reliability into the chamber.

If you really wanted to do 40 Super right on the Glock platform, you need more of slide mass, definitely not just a stock G21 slide. The best option might be a LW solid top G20 slide, with the breech face opened up to accept the 45 ACP case head. Of course, their G21 long slide is still heavier than the stock Glock slide, so that's an option too.

Use a good effective muzzle brake and heavier recoil springs too, of course.

Quote from: Yondering on November 15 2012 07:42:11 PM MST
If you really wanted to do 40 Super right on the Glock platform, you need more of slide mass, definitely not just a stock G21 slide. The best option might be a LW solid top G20 slide, with the breech face opened up to accept the 45 ACP case head. Of course, their G21 long slide is still heavier than the stock Glock slide, so that's an option too.

Use a good effective muzzle brake and heavier recoil springs too, of course.

Yeah, I was leaning towards the Lonewolf G21LS.  Although I finally just got my G20LS....so I'm gonna have to save my pennies for a while, If I decide to go through with it.

Shot my 40 super today along with a 9X25 Dillon and 460 Rowland.. Love them all..
Let a couple buddies shoot them for their first time. One voted for the 40 Super, the other 460 Rowland but my fav is the 9X25..