Recommended Jword reloading forum

As the title suggest, i'm looking for a J word forum. I'm reloading for an AR to start shooting CMP service rifle and have a question and not sure where or if to ask here, so hopefully this post is ok.

I've check with a Hornady OAL gauge and the bullets set .010 and .015 back and tried factory ammo that measured .035 off and cycled fine but out of caution smoked the rounds and came up with these marks below.

The marks are only on one side, a straight line in the middle with curved lines on either side going opposite directions. What the........?

Anyhow, if you all can help, with additional forum or what i'm seeing i sure would appreciate it.

I figure to cerrosafe the chamber tomorrow, it got late fast tonight.

Thanks!

The ejector button will push them over to one side as they chamber and the bolt face rotates & locks, you'll see strange marks.
Or if you feed them from a magazine, the lips will leave marks.

If it was done by rifling in a short chamber, the marks would be all around the nose, one for each land
and you'd probably feel it when they chambered up and the bolt didn't want to lock.

If they fit a loaded cartridge gauge, they're probably OK.


This is just a wild guess. Your mileage may vary.

On the marks my guess would a sharp edge on the barrel extension is the source.

http://forums.thecmp.org/

http://forum.accurateshooter.com/

http://www.jarheadtop.com/jim_owens_articles.html

https://m14forum.com/rifle-competition/

http://forums.delphiforums.com/GaHighpower/start

https://thefiringline.com/forums/forumdisplay.php?f=15

https://www.northeastshooters.com/xe...ompetition.36/

http://highpowerrifle.us/

http://forum.accurateshooter.com/thr...power.3805539/

http://bulletin.accurateshooter.com/tag/glen-zediker/

https://www.midsouthshooterssupply.c...y-glen-zediker

Thanks for the replies, guys! I've been out in the shop tinkering with it and it is in fact the barrel extension that's doing it, those edges are sharp.

Thanks again, i really do appreciate your time!

M-Tecs mentions many good ones, I'll add one that I have a couple of friends at.
https://www.handloadersbench.com/

shoot a few thousand rounds and those edges will dull a bit. :)

either way they won't affect anything.

if the bullets were seated too long, you'd have a "ring" around the bullet where the rifling startes and you'd have a heck of a time getting the bolt to close, or in the opposite case, youd have to 'grenade' your AR to get the round out.

Thanks for the links....... definitely a steep learning curve for HP shooting.

I load for a couple of singles and bolts and have gotten pretty familiar with seating depth and the associated marks on the bullet, but these with the radiuses going opposite directions threw me.

I load for couple ARs also, but just volume/plinking rounds straight from the book. Now that i'm making "match grade" AR ammo and seating heavy bullets close to the rifling is what got me double checking things when this turned up. It's an AR/semi-auto thing my singles/bolts don't do. Once i slowed down and s-l-o-wly ejected the case i could see that's when the drag occurred causing the marks.

That's why i do this stuff....... always learning. Now if i could just be competitive with cast bullets :)

Just a idea ... FWI

But i was loading some new to me brass.

A new 55g bullet fmj and had been loading soft point .. did not change the die or anything

A new powder for me to try ...load and seat 100 rounds ..

max oal by the book .. neck and cannelured were all most touching .. looked like factory

Went to the range:killingpc

loaded rounds were too long for a ar mag

Went home and added .015 to the seating die

https://www.youtube.com/watch?v=jMe0_HgkYEQ

It is also suggested to lap the bolt/extension but I don't think that is often done. Takes off the sharp edges but also makes the lugs all take even pressure. Those marks are from entering the extension so easily solved by diamond file or (yikes) dremel. As you are in competition, I would eliminate the problem. Truing the receiver/barrel too.

Depending on your neck tension of your casings, you can also detect contact by carefully measuring rounds seated a bit long first before chambering and after removal. The overal length will be close to zero clearance. I will seat another round just barely deeper and measure before and after chambering to see if the bullet seats deeper.

This technique is for bullets that do not engrave well upon engaging the rifling.

Three44s