Jim Watson
Member
Is the bottom edge of the chamber above the barrel ramp SHARP?
Measure bottom of case to case mouth, bottom of case to top of shoulder, subtract, and you’ve got an accurate measure of the shoulder protrusion. .040 is a bit too far, I think.Measured how much of the shoulder is sticking out of the brass....very hard to tell accurately
but think it’s around .040.
If it looked like your pic of the malfunction, this would have been an opportunity to further refine the diagnosis by firmly pushing the muzzle end of the barrel against something solid like a tree or bench.Experienced another failure to feed while chambering a round.
If this is still happening with other magazines, you'll want to gently round the sharp edge where the barrel ramp and chamber meet.Marked the brass and it is for sure catching on the bottom.
Is the bottom edge of the chamber above the barrel ramp SHARP?
If it looked like your pic of the malfunction, this would have been an opportunity to further refine the diagnosis by firmly pushing the muzzle end of the barrel against something solid like a tree or bench.
If this is still happening with other magazines, you'll want to gently round the sharp edge where the barrel ramp and chamber meet.
Just wanted to come back with a couple updates. Ran 1 round through a Lee FCD. It worked the brass over good and squeezed the lead bullet down....
Experienced another failure to feed while chambering a round. Marked the brass and it is for sure catching on the bottom. Racking the slide back doesn’t free it so it hung up fairly well.
Measured how much of the shoulder is sticking out of the brass....very hard to tell accurately
but think it’s around .040.
Will do some testing with different magazines hopefully this weekend.
Looking at the bullet it appears to me that it may be too long. I have just a thumbnail thickest of the shoulder showing. Your about 2-3 times what I'm using. The shorter oal will help on feeding. And like said adj your crimp to .472" - 0.471" will help too, your a little fat.
Hard to tell for sure from your pic but, it looks like that round could definitely use more crimp. I had the occasional jam when I started using 200gn SWCs also, and now get 100% reliability with them. Seating depth really didn't change much (I use 1.240") and I'd still get the occasional 3-point jam like yours. I took note of which cases would jam and the only brand that never did was Remington.
Make sure the FCD doesn't swage your bullet. Then you'll have new problems.
My CZ97 loves SWCs! Just a matter of troubleshooting and a bit of polishing. I use the same SWCs in the CZ97 and the DW and find them totally reliable.I load 200 Gr SWCS at 1.260/.1265 OAL and use a very light taper crimp (Just does remove the bell.) Runs in my guns, except for the CZ97 which is finicky with SWCs.
I had all kinds of issues getting my reloads to feed consistently, (200gr lswc Bayou Bullets), tried everything. Once I got the crimp right, no more problems. .469-.468" was the 'trick', .470" and over, jam city.
What COL did you end up with using the BB LSWC? I too load them and had some three point jams in my P220. The “old” guy at the club laughed and said “get a 1911”, but then gave me the thumbnail thickness recipe and it did help a bit. I am working on a .45 1911 but it isn’t here yet. The reason I ask is there’s considerable discussion about the COL based on the mold and apparently not all SWCs have the same shape. I’m not sure how much that affects the incredible journey a round makes in a .45 action.
Yes, but...If you're following published data like the Hodgdon online reloading guide, they have the following for a 200gr Cast LSWC:COL is not so important with SWCs... as long as the thumbnail shoulder is observed.
That's so funny! If I want to induce 3-point jams in my 1911, all I have to do is use R-P brass! It allows so much setback that the sharp edge of the case gets exposed and snags on the top of the barrel. I can only use the R-P stuff in my wheelgun rounds.
Maybe we should swap brass?
It sounded strange when I first heard it also, but enough reliable folks have repeated it to give it some credibility.I've loaded all SWC's based on the thumbnail.