Had 3 Win. primers pierced in 2 different loads with different powders today. No indication of pressure issues like flattened primers or stiff bolt extraction. These are older standard primers in white boxes and have never had a pierced primer in 40 years of loading. I have not had any issues with these primers of any kind. New rifle and no problem with factory ammo (200 rnds) and wonder if there is fireing pin problem with soft prmer issue?

This is my first ar build. Some guys say do the head spacing others say don’t worry about it…. 
I have a hodge podge of parts. Aero upper, cmmg barrel, and a Grendel hunter bolt. 

Coming from the bolt world headspace is 100% especially for accuracy.
I’m not building a 1000 yard ar but accurate round on target (coyotes,fox bobcat ) are a must

...decided to check this out, seeing as how it's a free program to download.  It's pretty slick, BUT.....some of the figures I get for various bullets & powders were surprising, most of the load charges appeared as "overpressure" in the GRT, even when I duplicated Hornady & Hogdon's published data.  I think my temperature (85F year round)  inputs were causing the numbers I saw.  I can get the program to spit out the same FPS numbers with lower charge weights.  I found the "Expert" mode to give me more flexibility in what inputs I put in to match my barrel length & twist.

...BLUF, I just need to get out and test. 

YMMV

6ARC Shooters of America! We are pleased to announce our very first MONSTER gas block product. Like our barrels and our muzzle devices and our bolt, we've finally been able to design a gas block exactly the way WE think it should be done — and we hope you agree!

The MONSTER Ultralite Gas Block is a low-profile, no-nonsense non-adjustable style that perfectly fits under handguards and provides the superior interface of a clamp-on model — with the added bonus of flush-fitting screw heads. Our gas block maximizes surface area contact with the barrel and evenly distributes clamping forces around the whole of the gas block journal.

The MONSTER Ultralite Gas Block features:

• Low-profile for installation under handguards
• Clamp-on style
• Lightening cuts for a weight of 1.2 ounces
• Three provided 3/32 hex head screws and one gas tube roll pin
• Non-adjustable, K.I.S.S., no-nonsense reliability
• Black Nitrided for all-weather durability and rich color
• 4140 ordnance steel
• Sized for use with .750" gas block journals
• Made in Wisconsin, U.S.A.

Found on the SixFiveArms website HERE.

Attached Files

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Our MONSTER Ultralite Bravo Closed-End Three-Slot Flash Hider has finally been released from supply chain crisis purgatory and is in stock and ready to ship.

Order from the SixFiveArms website HERE.

Longer slots are better!

When pinned on a 14.5" barrel, the slim profile of .740 allows a gas block to be installed and removed.

Ultralite? Yes. Weighs 1.5 ounces compared to a standard A2 of 1.8 oz, and yet its design makes it much, much more effective at signature reduction.

• Fits 5/8-24 muzzle threads
• Length 2.25"
• 4140 ordnance steel
• Black Nitrided
• Made in Wisconsin, U.S.A.

Attached Files

Thumbnail(s)
               

Our MONSTER Ultralite Alpha Three-Prong Flash Hider has finally been released from supply chain crisis purgatory and is in stock and ready to ship.

Order from the SixFiveArms website HERE.

Three prongs are the best!

When pinned on a 14.5" barrel, the slim profile of .740 allows a gas block to be installed and removed.

Ultralite? Yes. Weighs 1.6 ounces compared to a standard A2 of 1.8 oz, and yet its design makes it much, much more effective at signature reduction.

• Fits 5/8-24 muzzle threads
• Length 2.25"
• 4140 ordnance steel
• Black Nitrided
• Made in Wisconsin, U.S.A.

Attached Files

Thumbnail(s)
           

What is holding back the 6mm arc in a bolt gun or do we even need a 6mm arc Bolt gun? For many of us the answer for this question may boil down to another cartridge may scratch our itch better than the 6mm ARC.

For my itch to be scratched I was seeking a caliber/cartridge  that was suitable for deer and Varmint hunting. I like the idea of longer barrel life. I really like the idea of burning less propellant & lower recoil.

Seems many are stuck on rifles set up with a 308 bolt face & if you can't get past that then the good news as there are many cartridges to choose from calling for that bolt face.

I wanted this cartridge for the CZ527 platform & thus 308 bolt face was the furtherest thing from my mind. Was very sorry to see CZ opted to drop the mini Mauser action this year & thus a great platform for the 6mm ARC. Looking like Howa may be the primary kid on the block going forward in my view for a mini action made for the 6mm ARC. Correct me if you see this differently.

Fortunately for me I had a few CZ 527's purchased already with a barrel switch in mind. What can I say other than I tried it & like it. So far she has been loaded with a range of bullets from 80 GMX to 108 GR Elite hunters. My experience has been favorable with everything I have tried thus far.
More folks than myself have had favorable results on deer with the 6mm ARC. In my case there has only been one deer hunting opportunity made available since putting this rifle together. More about the rifle, a CZ 527 barreled with a 22" SS light contour 5 groove 7.5 twist barrel. Hunting load settled on was a 108 GR Elite Hunter that produced 2780 FPS at the muzzle & 3/4 MOA accuracy at 100 yards. Shot opportunity came for the nicest deer I have ever had the opportunity to hunt.

With that 108 gr Elite hunter at 250 yards I did not feel under gunned. So yes shot opportunity presented worked out to be at 254 yards. High shoulder shot placement was selected As it worked out I found a very solid rest or I would have passed on this shot opportunity. 

Anyone familiar with the CZ 527 would be Familiar or at least aware of the set trigger option. I most frequently use the set trigger option. So as the  crosshairs were settled high on the shoulder of the buck, the set trigger was set. When the trigger was touched their was an audible click though she did not fire. Sorry to say this is not uncommon for my experiences with this rifle. No problem just re-set the trigger & try again.

So the trigger was re-set & cross hairs re-settled. This time their was a mild crack and a thwap/crack  to be heard. The scope did jump a bit. Though was quickly resettled & a bit of shock & awe was experienced to witness that the buck was down & out right there.

So based on this sample of one Id dare say the 6mm ARC is very capable of taking a whitetail deer. I have taken deer with Archery Equipment, 6.5 Grendel, 6mm Rem, & 270 Winchester & generally see a quick kill. Never have I seen a deer expire any quicker than this deer had with the 6mm ARC. This is more a testimony of shot placement than caliber choice.

First time I opted for a high shoulder shot & will likely employ this again.

What is holding back the 6mm arc in a bolt gun or do we even need a 6mm arc Bolt gun? For many of us the answer for this question may boil down to another cartridge may scratch our itch better than the 6mm ARC.

For my itch to be scratched I was seeking a caliber/cartridge  that was suitable for deer and Varmint hunting. I like the idea of longer barrel life. I really like the idea of burning less propellant & lower recoil.

Seems many are stuck on rifles set up with a 308 bolt face & if you can't get past that then the good news as there are many cartridges to choose from calling for that bolt face.

I wanted this cartridge for the CZ527 platform & thus 308 bolt face was the furtherest thing from my mind. Was very sorry to see CZ opted to drop the mini Mauser action this year & thus a great platform for the 6mm ARC. Looking like Howa may be the primary kid on the block going forward in my view for a mini action made for the 6mm ARC. Correct me if you see this differently.

Fortunately for me I had a few CZ 527's purchased already with a barrel switch in mind. What can I say other than I tried it & like it. So far she has been loaded with a range of bullets from 80 GMX to 108 GR Elite hunters. my experience has been favorable with everything I have tried thus far.
More folks than myself have had favorable results on deer with the 6mm ARC. In my case there has only been one deer hunting opportunity made available since putting this rifle together. More about the rifle, a CZ 527 barreled with a 22" SS light contour 5 groove 7.5 twist barrel. Hunting load settled on was a 108 GR Elite Hunter that produced 2780 FPS at the muzzle & 3/4 MOA accuracy at 100 yards. Shot opportunity came for the nicest deer I have ever had the opportunity to hunt.

With that 108 gr Elite hunter at 250 yards I did not feel under gunned. So yes shot opportunity presented worked out to be at 254 yards. High shoulder shot placement was selected As it worked out I found a very solid rest or I would have passed on this shot opportunity. 

Anyone familiar with the CZ 527 would be Familiar or at least aware of the set trigger option. I most frequently use the set trigger option. So as the  crosshairs were settled high on the shoulder of the buck, the set trigger was set. When the trigger was touched their was an audible click though she did not fire. Sorry to say this is not uncommon for my experiences with this rifle. No problem just re-set the trigger & try again.

So the trigger was re-set & cross hairs re-settled. This time their was a mild crack and a thwap/crack  to be heard. The scope did jump a bit. Though was quickly resettled & a bit of shock & awe was experienced to witness that the buck was down & out right there.

So based on this sample of one Id dare say the 6mm ARC is very capable of taking a whitetail deer. I have taken deer with Archery Equipment, 6.5 Grendel, 6mm Rem, & 270 Winchester & generally see a quick kill. Never have I seen a deer expire any quicker than this deer had with the 6mm ARC. This is more a testimony of shot placement than caliber choice.

First time I opted for a high shoulder shot & will likely employ this again.

Purged, as soon as it can be verified.
Thanks to the users who identify them first, we will continue to keep this forum clean and on topic.
Regards,

Me... a shiny, brand new Colt Python. I've been itching for one since, like, forever! Got a dividend check in the mail yesterday & finally scratched that itch!