Quote from: mcseal2 on May 07 2019 09:32:50 AM MDT
I have a Ruger SR1911 Night Watchman in 45 and really like that gun.  I had a Commander size SR1911 stolen a while back.  I like the Rugers, but they don't offer the rail I want on this gun.  I definitely want a light rail on whatever I go with.

I'm the one who just recommended the G20 double mag spring to you;  my other 10mms are a vintage S&W 1006  and a recent purchase of a Colt Delta Elite 1911 10mm.  I grew up on 1911s,  and chose the Colt as it is a "Colt" and is all stainless steel to resist environmental concerns and is a 5" with just the single left side safety and a nice bump on the grip safety and Novak sights.  I did not want a rail but they make a DE with one. The barrel is not as supported as other 1911s,  but I shoot Underwood ammo all OK with only slight case bulges on some.  I am now carrying the Colt DE with UW 180&200 XTPs with the heavy hard cast DT230 (and UW220 HC after future testing proves OK) for woods.

Quote from: The_Shadow on May 06 2019 06:05:27 PM MDT
I have measured the Underwood 220 WFN Hard cast cartridges with Meplat 0.280", C.O.A.L. 1. 2520" - Meplat 0.2810", C.O.A.L.: 1.2660".
Based on troubles others have had with WFN bullets with even wider Meplats they were loaded seated to 1.2420" to improve feeding situations.

You should see if you can improve feeding by having them seated slightly deeper (shorter COAL) to help with the tipping angle as the cartridge strikes the roof of the chamber and the head tries to slide up the breech face to fully chamber.

I don't think it was that kind of FTF;  mine were always "bolt over round"  FTFs where slide causes nose down in mag jams,  caused by round not up high enough when slide comes forward.

I have been thru all the same problems you are experiencing and have found solutions!  I have a G20 gen3.   Had feed problems with UW200HC.
Tried 22 and 24lb captured recoil springs, no better.  The problem is that the mag spring isn't strong enough to push the stack up with the higher slide velocity.  The 24lb spring aggravates the problem as it returns the slide faster. I have a friend who experimented with all types of fixes and we agree on the solutions.

The +10% mag springs didn't work!   What does work is a 19 or 20lb uncaptured Wolf  recoil spring on a Wolf guide rod coupled with using two G20 mag springs.  The "double spring" mag will hold 12-13 rounds not 15!   I have also tried mag springs from a company that does comped conversions to Glock 45cal (promised friend I wouldn't reveal their name) that work just like the double spring.  Another forum member found success using a double spring from a Glock 19 (9coil).  With the G20 double mag spring I got 50% slide lock back with one round remaining, problem being the follower pops up further and catches the slide lock. The solution is to cut down the little"nub" on the follower that engages the slide stop.


So, with the 19lb recoil spring and double G20 spring  mags with the followers modified my G20 now functions 100% with the UW200Hc and all the other ammo I've tried. The only downside is you lose two rounds of mag capacity.  I am going to try my new Glockmeister +2 mag extensions with the G20 double spring to see if I can find a 15rd solution.


Hope this helps from one who has done extensive testing to fix this problem!