Feeding problem - Please help

[hughmongus]

I have been trying to get my Grendel to feed & fire reliably without much success. I have been using Hornady brass, 123g AMax bullets, and some Nosler 123g BT bullets with OAL from 2.25 - 2.70 and nothing will chamber reliably. The rifle shoots great when I get one chambered. I'm thinking it could be the magazine but I would appreciate some more experienced feedback. Also wondering if polishing the feed ramps would help? Thanks in advance for any help.

Picture of bolt picking up a new round:


Round gets stuck here without help:


Case damage:


After I get a round to chamber it leaves a rub on the bullet:

[ricsmall]

looks like you need to "meltdown" your feed ramps. Do a search on here. LRRPF52 had some posts on the subject. That should help you some with the round catching on the ramps and scarring. I dont know whats causing the marks in last photo, what chamber/whose barrel do you have?

[hughmongus]

Bhw 264 lbc

[Bwild97]

Have you tried to widen the mag feed lips?

The last photo is showing a fairly short throat.

[sneaky one]

Make sure the ejector isn't too long, & and raise the mag. lips .020-gently=more in the front-almost zero in the rear, do the ultra slo mo release to see where the tip hits the ramp= get a helper to see. Which feedramps are in there? Oh no, another BHW issue.

[hughmongus]

I removed the barrel yesterday. The feed ramps had awful tooling marks on them. I sanded the feed ramps until the tooling marks were gone then buffed them to chrome like finish with a dremel. I fired 10 rounds through it yesterday and it cycled every round.

[ricsmall]

glad you got it running.

[kamrr4437]

Awesome man glad to hear it.

[txgunner00]

I guy I shoot with here locally had the same issue as you with a barrel from another manufacturer. Similar symptoms & damage to the rounds. He sent it back and the manufacturer performed the same fix. Works great now.

[Bwild97]

hughmongus, How is that Polymer lower working for you? Does your mag fit a little tight? I'm glad you got that upper running, show us some groups!!!

[hughmongus]

Shot 30 rounds today with zero problems. As soon as I find the "sweet" round I will put some groups in here. I am currently trying the CFE loads that BWild has in another thread. I'm trying to ween myself off my SOCOM and now that the Grendel is running it will make that a little easier.

hughmongus, How is that Polymer lower working for you? Does your mag fit a little tight? I'm glad you got that upper running, show us some groups!!!

The poly lower is good. It has a 5.5lb trigger out of the box. I am putting the aluminum lower back on it though. I originally bought that poly lower for my .22LR.

Since everyone loves gun porn.

This is my .22LR plinker.



My Grendel



My 458

[hughmongus]

Engraving on the receiver that always puts a smile on peoples faces.

[sneaky one]

hugh, glad your gun runs, sad You had to fix the problem-that's kinda--badd....... I'm bad-bad bad bad-- Badd-,,, I'm nationwide! ZZtop, 1980.= Sorry.

[ericv]

Awesome! What stock is that on the Grendel?

[hughmongus]

awesome! What stock is that on the grendel?

ace arul