I thought I had a good load for my Kimber Gold Match II; Precision moly 200gr SWC, 5.4gr W231, OAL 1.245, crimp .4690 with mixed headstamp brass (except no R-P brass). This load worked great at the range with static targets, but under the stresses of a (USPSA) match, my Kimber became a jam-o-matic at a recent match. The round seems to get jammed going into the chamber at an angle. I absolutely know it's the ammo, because the last two stages I used my son's ammo, which is basically the same load but with Precision's 200gr RNF (OAL of 1.220). My GMII worked flawlessly. I'm using new Wilson ETM mags and my son was using new Wilson 47D mags.
I'm about to decide my Kimber Gold Match II just does not like SWC (chamber too tight maybe?) My son's Kimber Custom Classic Target has no problems with them. My GM does very well with RNF but SWC it feed jams at the most inopportune time. The jam is what I believe is called a 3 point jam, see attached pic.
I've tried Missouri Bullets 200gr and Precision Bullets 200gr SWC in the GM, with various OALs, and have not found a sweet spot yet. I've tried 1.245 to 1.220, and have not found an OAL I felt comfortable with. 1.250 and longer the nose of the bullet hits the barrel hood when manually ejecting a round (as in showing clear at the end of a USPSA match stage).
Mags are fairly new Wilson ETM 8 round mags. I have 5 of these, plus a couple of CMC mags. I have noticed that when a jam occurs, if I bump the bottom of the mag the slide will go into battery. I have not noticed jams with a particular ETM mag. Also, I have not noticed a jam with either of the CMC mags.
I've been running 5.4gr of W231 with a .469-.470 crimp in both SWC and RNF from Precision Bullets. The RNF run nicely at 1.220 OAL.
The throat on both the GM and Target are nicely done and polished.
My son competes with me at USPSA matches, and would really like to keep to one load for the both of us. But at this point, I'm looking at two different loads. :banghead:
I'm about to decide my Kimber Gold Match II just does not like SWC (chamber too tight maybe?) My son's Kimber Custom Classic Target has no problems with them. My GM does very well with RNF but SWC it feed jams at the most inopportune time. The jam is what I believe is called a 3 point jam, see attached pic.
I've tried Missouri Bullets 200gr and Precision Bullets 200gr SWC in the GM, with various OALs, and have not found a sweet spot yet. I've tried 1.245 to 1.220, and have not found an OAL I felt comfortable with. 1.250 and longer the nose of the bullet hits the barrel hood when manually ejecting a round (as in showing clear at the end of a USPSA match stage).
Mags are fairly new Wilson ETM 8 round mags. I have 5 of these, plus a couple of CMC mags. I have noticed that when a jam occurs, if I bump the bottom of the mag the slide will go into battery. I have not noticed jams with a particular ETM mag. Also, I have not noticed a jam with either of the CMC mags.
I've been running 5.4gr of W231 with a .469-.470 crimp in both SWC and RNF from Precision Bullets. The RNF run nicely at 1.220 OAL.
The throat on both the GM and Target are nicely done and polished.
My son competes with me at USPSA matches, and would really like to keep to one load for the both of us. But at this point, I'm looking at two different loads. :banghead: