OK, my 1st time out to the range, my 3rd round hung up for a failure-to-feed. The remainder of the box (50) of cheap ammo ran flawlessly. 2nd time at the range, I reloaded 100 - 185 grain SWC to specs per Hodgdon online manual. My ftf rate was about 15% failures. Needless to say, frustration overcame me to the point of cursing loud enough for others to hear me (even while wearing ear protection). All of my other calibers I reload for have been near 100% reliability including my kahr 9mm, Glock .40, and Taurus 357/38 special with swc, rn, fmj, and jhps. After talking to a few 1911 handloaders at the range, I learned that many 1911s are very finicky with swc's. They gave me some tips on oal seating and crimping for 45 acp swc's.
I went home and lightly polished the feed ramp and throat. I extended the oal a few 1000's of an inch and taper-crimped them a little tighter. The following day with my new (and improved handloads) i went back and experienced a 5% ftf. The guy right next to me gave me 7 of his factory 130 grain rn's to try. I did and again 1 ftf out of the mag.
Again I went home and quickly reloaded 50 more and lengthened the oal and tightened the crimp even more and purchased a box of cheap ammo (130 rn's) on the way. I fired 25 of the factory ammo with no ftf's and 50 handloads with only 1 ftf. So now I'm down to about 1.25% failure rate.
Other possibilities from reading forums are: 1) the bulk on the end of the slide-stop pin is in the way a bit of incoming rounds from the mag. 2). Get Wilson Combat Mags and "problem solved." 3) Stronger slide spring. 4) Send it back to Remington for warranty work. 5) Give it an extra 100 rounds to break in.
Any suggestions anyone?