Feeding issues with light SWC

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Feeding issues with light SWC

Post by inthebeech on 11/18/2017, 4:51 pm

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
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Re: Feeding issues with light SWC

Post by Jon Eulette on 11/18/2017, 5:01 pm

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
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Re: Feeding issues with light SWC

Post by Multiracer on 11/18/2017, 5:59 pm

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.

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Re: Feeding issues with light SWC

Post by inthebeech on 11/19/2017, 7:21 am

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
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Re: Feeding issues with light SWC

Post by willnewton on 11/19/2017, 7:36 am

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.
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Re: Feeding issues with light SWC

Post by inthebeech on 11/19/2017, 7:51 am

Will do.  Thanks.
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Re: Feeding issues with light SWC

Post by inthebeech on 11/19/2017, 5:41 pm

Well, I obviously had no time to shoot today but I loaded a couple dummy rounds with each bullet and found what you see here when I remove the recoil spring and push the slide manually to extract and feed a round from the mag.  Note however when I really sling that slide fast, even the 170's seem to feed ok but when I move it more slowly, the resulting jam is exactly what I saw at the range with live ammo.  Also Will was also correct in that at 1.25 COL, the rim is about .015-.030 proud of the barrel hood so regardless where we go from here, I will be seating them deeper and at least fix that issue.  Thanks Will
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Re: Feeding issues with light SWC

Post by willnewton on 11/19/2017, 7:43 pm

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!
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Re: Feeding issues with light SWC

Post by USSR on 11/20/2017, 7:33 am

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

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Re: Feeding issues with light SWC

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