Feeding issues with light SWC

I am seeing feeding issues (stove pipeing)  with the Magnus 170 SWC (#806) where there was zero issues with their 200 gr bullet of the same style (#812).  The lighter bullet definitely has a smaller diameter at the nose so I suppose this is the hang up.  I am using identical seating depths and the two bullets are both exiting at similar velocities.
Anyone else have experience with this?  What is the recommended course of action?  Gun is a Colt GCNM series 70 which is all stock.
Thanks,
Ed

What powder & charge? Is bullet shorter (part that is seated below case mouth). You might not be getting enough pressure with shorter bullet. What is your crimp? Try .465-.467"
Jon

Are you having feeding issues or ejecting issues ? I had to make them ( Magnus 170 G SWC ) real short to clear the top of the chamber 1.181" comes to mind, otherwise they would not feed out of the mag and into the chamber.
If they go bang and then get stuck trying to leave the gun.... talk to Jon.

Velocity is equal with both bullets - 740-750 ft/sec.  COL is the same at 1.25".  I didn't really pay too much attention to ejection to notice whether the 170's were coming out with less authority; that's a great tip Jon.  I can load up some with a heavier taper crimp to get pressures back up there as you suggest but I think that the breech face is definitely behind the case rim since I was able to "complete" the chambering with extra force behind the slide and it went in to battery.  Although COL is identical, I can certainly go shorter with COL maybe .050" or so and see if this helps but that's about all I have to work with as the shoulder is currently only about .060" proud of the mouth.  I'll also try to remember to take a photo the next time it happens so you guys have something to work with.  Ed

inthebeech wrote: the shoulder is currently only about .060" proud of the mouth.

Should be about half that, .020-.030”.  That may be why you have to give it a shove.  LSWC should be set from the shoulder.  You can buy LSWC shoulder setting dies that will set from the shoulder without regard to the nose shape..

Also, have you tried the “plunk test” by dropping them in the barrel directly or do you use a chamber checker?  They should fit just fine without being forced.  This will help you isolate an ammo issue from a pistol issue.

No need to worry about chrono speeds until you can get ammo that cycles, then go back to the chrono for fine tuning.

Will do.  Thanks.

This fella has inserts for LSWC.  These are for a Lee press, but check his other listings for other press makes.

https://www.ebay.com/itm/Lee-45-Cal-seating-Insert/142552669647?hash=item2130cd1dcf:g:qhMAAOSwqfNXmjMe

No problem to help another NC Bullseye shooter!

willnewton wrote:This fella has inserts for LSWC.  These are for a Lee press, but check his other listings for other press makes.

https://www.ebay.com/itm/Lee-45-Cal-seating-Insert/142552669647?hash=item2130cd1dcf:g:qhMAAOSwqfNXmjMe

No problem to help another NC Bullseye shooter!

Thanks for posting that link.   Just ordered one for my RCBS die.

Don