My friend was shooting his FNAR today, about every other round came out with a dented case neck. Any ideas on what could be causing this. I have pictures if anyone wants to see them.
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Help on dented brass - FNAR
- Thread starter worldhunter
- Start date
Re: Help on dented brass - FNAR
I have the same problem with some of my cases from my SR25. I thought it was because it hits the bench or my case next to the rifle. If I am wrong I would like to know as well
I have the same problem with some of my cases from my SR25. I thought it was because it hits the bench or my case next to the rifle. If I am wrong I would like to know as well
Re: Help on dented brass - FNAR
Many self loading Military rifles dent the case necks and or case bodies during ejection. Engineers don't have the reloader in mind when designing these rifles. It's normal.
Sometimes, you can tape a piece of velcro or other material to help buffer the brass where it's being dented on the rifle during ejection.
Many self loading Military rifles dent the case necks and or case bodies during ejection. Engineers don't have the reloader in mind when designing these rifles. It's normal.
Sometimes, you can tape a piece of velcro or other material to help buffer the brass where it's being dented on the rifle during ejection.
Re: Help on dented brass - FNAR
Pics might help, but it sounds like you're describing routine dings caused by simply running through an autoloader. They're hard on brass. Some are harder than others, but none of them are exactly gentle during ejection.
Let's see the pics, and we might be able to say for sure.
Pics might help, but it sounds like you're describing routine dings caused by simply running through an autoloader. They're hard on brass. Some are harder than others, but none of them are exactly gentle during ejection.
Let's see the pics, and we might be able to say for sure.
Re: Help on dented brass - FNAR
It happens to my FNAR too. I read that you can adjust the gas block screw but I haven't tried yet. Here are some Federal GMM brass from my last outing. Nothing too serious but something us bolt gunners are not used to seeing. I would think that the suggestion to put the fuzzy Velcro on the receiver might be a good way to remedy without having to fiddle with the gas block adjustment. I do believe it is caused when the brass is slammed into the exterior of the receiver upon ejection.
It happens to my FNAR too. I read that you can adjust the gas block screw but I haven't tried yet. Here are some Federal GMM brass from my last outing. Nothing too serious but something us bolt gunners are not used to seeing. I would think that the suggestion to put the fuzzy Velcro on the receiver might be a good way to remedy without having to fiddle with the gas block adjustment. I do believe it is caused when the brass is slammed into the exterior of the receiver upon ejection.
Re: Help on dented brass - FNAR
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Siafu</div><div class="ubbcode-body"> I do believe it is caused when the brass is slammed into the exterior of the receiver upon ejection.
</div></div>
I don't think it's from that, mine gets caught in a bag that doesn't allow the case to hit the receiver and I still get dents. I think it's from the extractor spring forcing the shell into various things in the rifle as the case is being ejected.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Siafu</div><div class="ubbcode-body"> I do believe it is caused when the brass is slammed into the exterior of the receiver upon ejection.
</div></div>
I don't think it's from that, mine gets caught in a bag that doesn't allow the case to hit the receiver and I still get dents. I think it's from the extractor spring forcing the shell into various things in the rifle as the case is being ejected.
Re: Help on dented brass - FNAR
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I don't think it's from that, mine gets caught in a bag that doesn't allow the case to hit the receiver and I still get dents. I think it's from the extractor spring forcing the shell into various things in the rifle as the case is being ejected.</div></div>
What shell catcher are you using?
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I don't think it's from that, mine gets caught in a bag that doesn't allow the case to hit the receiver and I still get dents. I think it's from the extractor spring forcing the shell into various things in the rifle as the case is being ejected.</div></div>
What shell catcher are you using?
Re: Help on dented brass - FNAR
Your brass is either hitting the inside of the receiver befor it goes out of the ejection port or your brass deflector. Most gas operated guns do this to some extent and it's normal. If it is too flat I'll use a small tool (needle nose pliers, screw driver) to pop the neck back out.
Your brass is either hitting the inside of the receiver befor it goes out of the ejection port or your brass deflector. Most gas operated guns do this to some extent and it's normal. If it is too flat I'll use a small tool (needle nose pliers, screw driver) to pop the neck back out.
Re: Help on dented brass - FNAR
Forget it. Perfectly normal, and they'll iron out quite nicely with eitehr a mandral or tapered expander ball. Welcome to loading for gas guns.
Forget it. Perfectly normal, and they'll iron out quite nicely with eitehr a mandral or tapered expander ball. Welcome to loading for gas guns.
Re: Help on dented brass - FNAR
I have found that if you decide to reload AND you find the right "recipe" for the FNAR, that the brass deformation will decrease dramatically.
When I first purchased mine, 2 years ago, I shot the
Winchester 7.62mm 147gr. FMJ. I was at times shooting MOA accuracy out to 300 yards, but the deformation rate of my brass was over 65%. Switching over to the 168 Gold Metal Match, my accuracy increased and deformation rate went down to about 40%. I had begun to catch my brass in a homemade net and base, to try and eliminate other factors, when i decided to build a dedicated hunting round for this rifle.
My shooting partner and reloader likes to find the heaviest bullet each barrel can stabilize and shoot accurately at distance. With the 20" barrel and 1 in 12 twist we found a 180 gr. sierra round nose loaded with Power Pro 2000 at a modest 2450 fps, produced MOA groups consistently out to 300 yards, AND a deformation rate of about 25%. For the deer hunting I do in south central alabama, it has proven to be an extremely deadly round. (We have since tried the 180gr. SierraGameKing SBT and had a little tighter groups, but no history of hunting results as of this writing.)
I believe that "hotter" rounds fired in the FNAR will produce more case deformation than slower rounds with a medium powder burn rate. Just a thought!
I have found that if you decide to reload AND you find the right "recipe" for the FNAR, that the brass deformation will decrease dramatically.
When I first purchased mine, 2 years ago, I shot the
Winchester 7.62mm 147gr. FMJ. I was at times shooting MOA accuracy out to 300 yards, but the deformation rate of my brass was over 65%. Switching over to the 168 Gold Metal Match, my accuracy increased and deformation rate went down to about 40%. I had begun to catch my brass in a homemade net and base, to try and eliminate other factors, when i decided to build a dedicated hunting round for this rifle.
My shooting partner and reloader likes to find the heaviest bullet each barrel can stabilize and shoot accurately at distance. With the 20" barrel and 1 in 12 twist we found a 180 gr. sierra round nose loaded with Power Pro 2000 at a modest 2450 fps, produced MOA groups consistently out to 300 yards, AND a deformation rate of about 25%. For the deer hunting I do in south central alabama, it has proven to be an extremely deadly round. (We have since tried the 180gr. SierraGameKing SBT and had a little tighter groups, but no history of hunting results as of this writing.)
I believe that "hotter" rounds fired in the FNAR will produce more case deformation than slower rounds with a medium powder burn rate. Just a thought!
Re: Help on dented brass - FNAR
Thanks for all the input. Looks just like the pic SIAFU posted. My expander mandrel took it right out.
Thanks for all the input. Looks just like the pic SIAFU posted. My expander mandrel took it right out.
Re: Help on dented brass - FNAR
My BAR, which doesn't have a deflector lump, does the same thing exactly. I think it is hitting on the front of the ejection port, or something. No problem with resizing.
My BAR, which doesn't have a deflector lump, does the same thing exactly. I think it is hitting on the front of the ejection port, or something. No problem with resizing.
worldhunter, Look at the REAR of the ejection port. You will see little marks on the receiver from where the case hits it. Just part of the FNAR. I have not seen one that doesent do that.
