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+--- Thread: Spiral scratches on bullets? (/showthread.php?tid=17561)
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Spiral scratches on bullets? - siconic - 11-25-2018
Primary Arms mags. Seem to work great, 250 rounds, no mag related issues, that I can tell.
https://www.primaryarms.com/5-65-SS-BM-BL-ASC
Spiral scratches on bullets? - siconic - 11-25-2018
Sticks Wrote:You mentioned "Way too slow" but you did not post any velocity readings. With a 20" 2475 to 2550 should be a good speed for the 123s
No chrono, but published load data suggests I would be well below 2200...
And I am currently shooting the SST's... The target was intended for the ELD's. I do have ELD's, but have not tested them yet. I did load 30 with 8208, but I have not fired them yet.
I am going to go out to 400 and see how low they shoot when zeroed at 100, that should give me a pretty close velocity estimation. Hoping to get close to 2650 with the CFE223, and others in the 31 gr range point to pretty close to that or factory velocities. Heres to hopping.
Spiral scratches on bullets? - A5BLASTER - 11-26-2018
siconic Wrote:No chrono, but published load data suggests I would be well below 2200...
And I am currently shooting the SST's... The target was intended for the ELD's. I do have ELD's, but have not tested them yet. I did load 30 with 8208, but I have not fired them yet.
I am going to go out to 400 and see how low they shoot when zeroed at 100, that should give me a pretty close velocity estimation. Hoping to get close to 2650 with the CFE223, and others in the 31 gr range point to pretty close to that or factory velocities. Heres to hopping.
I would say please get a chrongraph before working up they high a load. Should be some sales going on right now.
Spiral scratches on bullets? - grayfox - 11-26-2018
You need a chrony, especially when working 123's with 8208XBR, it tends to pressure spike quickly at the higher end. Plus if you have designs of 2650 from your 20" .... well I'd just warn that you should lower your expectations a bit, low 2500's, maybe range 2475-2520, is probably where your 123's will top out. Start low, don't shoot for the moon.
Spiral scratches on bullets? - Texas - 11-26-2018
You may want to polish the throat with some red scotchbrite an a .22 patch holder.
Spiral scratches on bullets? - imaguy3 - 11-26-2018
I would just leave well enough alone and go shoot. I personally wouldn't start doing anything in the chamber unless I'm having real legit malfunctions, in which case I'd be calling the manufacturer.
Here are pics from the round that chambered after I shot a coyote the other day. This round has only been chambered one time and was ejected gently by hand before driving home. As you can see the bullet got scratched and even the shoulder of the case gets dinged up from chambering. This will go back in my gun and still shoot moa.
I don't think it's a leftover artifact from nitride since my barrel is stainless steel (BA Hanson) and showing the exact same thing you have.
I do think that the process of a semi auto loading is inherently vicious and things get banged around a little bit.
![[Image: xWSFAxe.jpg]](https://i.imgur.com/xWSFAxe.jpg)
![[Image: zYRDCU5.jpg]](https://i.imgur.com/zYRDCU5.jpg)
Spiral scratches on bullets? - Sticks - 11-26-2018
imaguy3 Wrote:I would just leave well enough alone and go shoot. I personally wouldn't start doing anything in the chamber unless I'm having real legit malfunctions, in which case I'd be calling the manufacturer.
Here are pics from the round that chambered after I shot a coyote the other day. This round has only been chambered one time and was ejected gently by hand before driving home. As you can see the bullet got scratched and even the shoulder of the case gets dinged up. This will go back in my gun and still shoot moa.
I don't think it's a leftover artifact from nitride since my barrel is stainless steel (BA Hanson) and showing the exact same thing you have.
I do think that the process of a semi auto loading is inherently vicious and things get banged around a little bit.
You might want to check that COAL on that second pic. That bullet looks like it got set forward...a lot. Might just be the pic.
Spiral scratches on bullets? - A5BLASTER - 11-26-2018
Sticks Wrote:You might want to check that COAL on that second pic. That bullet looks like it got set forward...a lot. Might just be the pic.
I would have to agree. Might just be the pic but it does look like it has moved forward a good bit.
Again might just be the pic but never hurts too get a measurement.
Spiral scratches on bullets? - imaguy3 - 11-26-2018
It's the pic.. I get a ton of fouling in the chamber and magazine from my suppressor, I mentioned in a different thread (http://www.65grendel.com/forum/showthread.php?17940-Amend2-polymer-6-5-grendel-mags/page5)... that's what it is. The two pics are the same round, just spun 180*... The second pic was taken at a diff. angle though.
I can take a side by side pic of new rounds next to it later tonight when I get home.. but it's the same length, just super dirty...
Spiral scratches on bullets? - siconic - 11-26-2018
Wow, those marks looks almost exactly like the marks on my bullets, and I have a stainless 20" as well. I guess I will call everything "normal", lol.
Since my long range shooting is limited to what I was taught in the military, is there any advice on how to tighten my group from a shooters standpoint? Bags, mechanical benchrest, etc?
Spiral scratches on bullets? - A5BLASTER - 11-26-2018
siconic Wrote:Wow, those marks looks almost exactly like the marks on my bullets, and I have a stainless 20" as well. I guess I will call everything "normal", lol.
Since my long range shooting is limited to what I was taught in the military, is there any advice on how to tighten my group from a shooters standpoint? Bags, mechanical benchrest, etc?
Bags. Front and rear and a nice clean breaking 2 stage trigger
Spiral scratches on bullets? - imaguy3 - 11-26-2018
A5BLASTER Wrote:Bags. Front and rear and a nice clean breaking 2 stage trigger
optics, parallax, good marksmanship fundamentals...
Even small things can affect groups for better or worse, like a muzzle device. I didn't see anything in your pics that struck me as terrible shooting though.
Spiral scratches on bullets? - imaguy3 - 11-26-2018
Hell that flyer could have been a reloading issue too. Are you using a vld seating stem with those bullets? In my 280 shooting the 175gr eldx I need to, otherwise I'm not making even contact around the bullet and I get concentricity issues, as well as a ring around the bullet b/t the ogive and the tip.
Could have been anything that isn't consistent... odd piece of brass/inconsistent neck tension on that load, maybe the primer had an issue, maybe you misweighed the charge, maybe it was seated to a slightly diff. depth... who knows.
Spiral scratches on bullets? - imaguy3 - 11-27-2018
Brand new round on left, the round in above pics on right... heck it even looks like the tip took some good damage upon chambering too... yet even with all the damage after chambering these still shoot moa in my gun...
![[Image: snxP3L9.jpg]](https://i.imgur.com/snxP3L9.jpg)
Spiral scratches on bullets? - Recondo - 11-27-2018
I also have those case shoulder “creases” on a new rifle. Best way to fix? Shoots great. Thanks in advance.
Spiral scratches on bullets? - 1Shot - 11-27-2018
The scratches on the bullet are most likely caused by the compound throat that the SAAMI 6.5 Grendel chamber has. You can read all about this in the Volume 1 Grendel handloading handbook on pages 9 & 10. I quote " The Grendel is meant to function in both "Semi" and "Full Auto" models. The compound throat angle addresses accuracy of projectile alignment with the bore while the 0.300 neck diameter enhances feeding reliability." There is more to explain things further. So to sum it up the bullet will slide up into this compound throat before it gets to the lands and thus is being scratched. I have two rifles one with a SS BCA barrel and one with an SS Oden Works barrel and when rounds are loaded and extracted it leaves these same scratches on the bullet. I have rounds that have been chambered a number of times from my hunting trip this year where I loaded and unloaded the rifles a number of times and one of the rounds was chambered once by a full function of the rifle after firing a round when I killed a deer. The bullets are 120 Speer Gold Dot and 120 Sierra Pro Hunter. Both have the scratches and both rifles will shoot sub MOA. The BCA has been very picky as to what it wants to shoot and the 123 SST is the worst shooting bullet in it no matter what load I tried. The Oden barrel shoots well with most anything I have tried but what it really likes will shoot better than I can hold. My hold these days is not consistent dead nuts like when I was younger. I usually pull one out of five shots. The Oden will shoot a ragged hole group with 120 Sierra Pro Hunter for 4 shots but somewhere in the 5 shots I pull one just a might and open up the group maybe to 1/2". The BCA with what it likes hovers 3/4 to 1" with the Gold Dot. Hope this helps.