Rossignol said:I'm def gonna look up those magazines you mentioned... I almost bought those couple of magazines I saw yesterday at $15.99 ea. They were a great fit, no wiggle at all.
I think your Springer mags are almost certainly wadcutter feel lip design. And Colt factory mags use what's called a Hybrid lip which have tapered (but shorter) lips. Hybrids are good for lots of varying shapes and weights of bullets. The USGI/Hardball works with full length tapered lips and they work great on all but the very shortest bullets while giving full control over the cartridge throughout the feed cycle (known as controlled round feed).
Where I like the Hardball lips are how utterly smooth and effortlessly cartridges slip up and into the chamber almost horizontally and not at a steep angle like the other designs. It's noticaeable. No loud cha-chunk noise. And because they are my duty mags, I trust them to keep my round in controlled feed no matter what angle I'm subjecting the weapon to. I don't need a cartridge to be hanging in space somewhere inside the open ejection port, free from the magazine but not yet chambered.
Here's a pic from the checkmate industries web site showing the difference(s).
http://www.checkmatemagazines.com
If you shoot me a PM with an address I'll mail you one of my Checkmate stainless 7-rounders with USGI/Hardball lips for you to borrow and try out.