6 creedmoor feeding problems

greg olmstead

greg olmstead

CGN Regular
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Location
alberta
I cant get my 6mm creedmoor to feed properly. The cartridges are all 2.800" long. Its properly gassed as ejection and last round hold open are both right. It single feeds just fine but when I load the mag it catches on the bottom of the barrel just below the chamber. The end of the chamber is beveled. I've tried bending the feed lips on my mag but if I bend them anymore the mag wont seat or let the bcg slide home.

Build specs are:
Stag 10 upper and lower
Lantac E-BCG
JP H2 SCS
Superlative arms gas block
Rifle length + 2 gas system
Rainier arms +2 gas tube
CPD magazine and m118 pmag
Jury custom barrel 1-7.5 twist


Is there a specific magazine I need or what's going on. It's not short stroking and it's not over gassed. It feeds shorter bullets like the 75 gr vmax just fine but wont feed the 108 eldm or 105 nosler rdfs. Is it because the bullet diameter is too small for the barrel extension to pop the nose of the bullet up before it runs into the barrel?
 
I think I understand what you’re saying but some pictures would help. I run a stag 10 in 6.5 CM. I did experience similar issues with my LR PMAG. I found that usually it was caused by me riding the charging handle forward, even slightly. Basically the shoulder of the cartridge would get jammed into the barrel extension and there wasn’t enough spring pressure to actually chamber the cartridge. Having said that, when I made sure not to ride the CH, the issue disappeared. It also never happened during firing.

I found that for me switching to a flat wire buffer spring (I have a rifle length buffer setup) pretty much resolved this issue. My build list:

IBI 19” DMR barrel in 6.5CM
JP LMOS HP BCG
DPMS 308 rifle buffer
Strike Ind Flat wire 308 buffer spring
Superlative Arms 0.936” set screw adj has block
MW 15” MLOK rail
Insite Arms heathen 0.885”
Colt A2 stock
Giselle SSA trigger
Ergo enhanced grip.
 
haun0002 said:
I think I understand what you’re saying but some pictures would help. I run a stag 10 in 6.5 CM. I did experience similar issues with my LR PMAG. I found that usually it was caused by me riding the charging handle forward, even slightly. Basically the shoulder of the cartridge would get jammed into the barrel extension and there wasn’t enough spring pressure to actually chamber the cartridge. Having said that, when I made sure not to ride the CH, the issue disappeared. It also never happened during firing.

I found that for me switching to a flat wire buffer spring (I have a rifle length buffer setup) pretty much resolved this issue. My build list:

IBI 19” DMR barrel in 6.5CM
JP LMOS HP BCG
DPMS 308 rifle buffer
Strike Ind Flat wire 308 buffer spring
Superlative Arms 0.936” set screw adj has block
MW 15” MLOK rail
Insite Arms heathen 0.885”
Colt A2 stock
Giselle SSA trigger
Ergo enhanced grip.
Click to expand...

I got it figured out. The bullet tip was jamming into barrel causing stove pipes. I had to tweak the feedlips more to get it feed. My bullets fit perfectly between the lugs on the barrel extension and that's what the issue was. Had to seat them deeper to 2.750". I also changed the spring in my scs from the heaviest to the lightest spring. What I did seems to have fixed my problem.
Here are some groups that were shot with it last range trip

https://drive.google.com/folderview?id=1pVFxnKITdb_eBJ693szaL2FQZCzqcPw9
 
Great results!

Glad to see you got it running.

What barrel length are you running?

What load are you using and what are you getting for velocity?
 
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