How could or should the 6.5 mm Grendel be improved?

[SHORT-N-SASSY]

The increased bolt strength adds no weight to the system.

Let's do it!

[stanc]

Let's do it!

Are you going to do it? Let us know how it works out.

[SHORT-N-SASSY]

Are you going to do it? Let us know how it works out.

"The knee bone's connected to the thigh bone, . . ." --- http://68forums.com/forums/showthrea...or-the-264-LBC, http://rifleshooter.com/2011/07/rifl...r-model-60100/ (Scroll down page to 11th, 12th photos, click-on for close-up view).

[noone]

I've been messing with a case(capacity 42gr+-) that will push a 123 to around 2700fps from a 16"barrel(34gr 8208). More or less a Grendel stretched to 45mm. I'm not sure they would go for a full power round because of recoil and weight. Tony is thinking something that has a 20% weight reduction, less recoil but beats the 308 exterior ballistics.
It's wishful hoping but hey, that's how things get started.

A 6.5x45 Grendel is only 2mm short of the 6.5x47 Lapua. The 6.5x47 Lapua is pretty well established, and I'm not sure what the advantage of a 6.5x45 Grendel would be. I don't think it would fit into a AR15 sized magazine well as the bullet would have to be seated so far into the case that the case mouth would be over running the ogive. If you went to a Ar10 size rifle receiver, you might as well just go with the 6.5x47, or the 260 Remington...unless someone came up with a mid sized receiver that was between the AR15 and the AR10. If you could do that, and have the system with a "big bolt" concept, you would really be onto something.

[stanc]

A 6.5x45 Grendel is only 2mm short of the 6.5x47 Lapua. The 6.5x47 Lapua is pretty well established, and I'm not sure what the advantage of a 6.5x45 Grendel would be.

At least two advantages: Lighter weight, greater magazine capacity.

[woohoo]

A 6.5x45 Grendel is only 2mm short of the 6.5x47 Lapua. The 6.5x47 Lapua is pretty well established, and I'm not sure what the advantage of a 6.5x45 Grendel would be. I don't think it would fit into a AR15 sized magazine well as the bullet would have to be seated so far into the case that the case mouth would be over running the ogive. If you went to a Ar10 size rifle receiver, you might as well just go with the 6.5x47, or the 260 Remington...unless someone came up with a mid sized receiver that was between the AR15 and the AR10. If you could do that, and have the system with a "big bolt" concept, you would really be onto something.

We've been shooting the 6.5BRX in a AR15 since late 09. It is low capacity (10) using 15 round 6.8 mags but works fine for target and hunting. The 6.5x45 is something we are working on, it will have the same case capacity as the 6.5BRX. You are correct the 6.5x45(based on a Carcano) would be no advantage at all to civilian users. It would not work in a AR15 action or mag. The other mid sized thing was done back in late 09.

Add lower recoil than a 308 but better exterior ballistics to what Stan said.

[cory]

"The knee bone's connected to the thigh bone, . . ." --- http://68forums.com/forums/showthrea...or-the-264-LBC, http://rifleshooter.com/2011/07/rifl...r-model-60100/ (Scroll down page to 11th, 12th photos, click-on for close-up view).

Where there any reports on the success of constructor's bolt? I'm sure he posted reports, but I'm not a member of that forum therefore I couldn't access his posts.

[woohoo]

Where there any reports on the success of constructor's bolt? I'm sure he posted reports, but I'm not a member of that forum therefore I couldn't access his posts.

We only made 50 PPC size bolts for 1 small batch of barrels. They are being used but we don't hear much unless something goes wrong. None have broken on the PPC size or BR size.
I still have the first 6BRX I made in 09. 36 gr of N550 will push a 95gr SMK to apx 3200fps.

[SHORT-N-SASSY]

We only made 50 PPC size bolts for 1 small batch of barrels. They are being used but we don't hear much unless something goes wrong. None have broken on the PPC size or BR size.
I still have the first 6BRX I made in 09. 36 gr of N550 will push a 95gr SMK to apx 3200fps.

Woohoo,

How would you compare the AR Performance 800 Series .30 Rem AR bolt & extension set, with Remington's Bolt-Barrel Extension design used in their R-15 .30 Remington AR rifle? Which of these two designs has the larger Bolt circle diameter and Barrel Extension diameter? And, other than diameter, does one design offer more than the other?

I'd like to see a side-by-side comparison test. My personal thought: these designs open up a whole new ball game for the AR-15 platform.

[woohoo]

I've only seen the Remington design 1 time at the SHOT show, I really have no idea what size they are. The only thing I can say about design is I tried to use large radii instead of corners to increase strength at the lugs.

[cory]

We only made 50 PPC size bolts for 1 small batch of barrels. They are being used but we don't hear much unless something goes wrong. None have broken on the PPC size or BR size.
I still have the first 6BRX I made in 09. 36 gr of N550 will push a 95gr SMK to apx 3200fps.

Are those bolts interchangeable with the bolts we're using now?

[woohoo]

Are those bolts interchangeable with the bolts we're using now?

No, they (800 series)must use a different barrel extension. The extensions can't be swapped with a barrel that has the gas port drilled either.

[tcte]

are these bolts and extensions available for purchase? thanks,Kevan

[woohoo]

are these bolts and extensions available for purchase? thanks,Kevan

Not at the moment. They aren't really a money maker so we produce the high volume parts most of the time. If we can get a few thousand 5.56 and 6.8 bolts in the bins we may machine a small batch later in the summer.

For target shooting and hunting the normal 9310 alloy bolts seem to work fine with PPC based cartridges. I just commented because a high rate of fire could cause reliability issues in a military weapon. 5.56 bolts break, the bolts with a larger recess are weaker and the cartridges create more bolt thrust so common sense says they should break sooner in the same type of condition.

[tcte]

so these bolts are to sensitive for FA use?