6.5 Super LR Users

[daj]

I understand there are two 6.5 SLR reamers available, the 6.5mm Super LR (standard throat), and the 6.5mm Super LR/S (short throat).

To anyone who has used the standard 6.5mm Super LR reamer and runs the Berger 140 VLD, what is the OAL of the cartridge with the bullet seated to touch the lands?

Thanks

 

[ohnomrbillk]

From Here: http://www.6mmar.com/65_SuperLR.php

The short reamer COAL is below.

Sierra 142 gr. MatchKing - 2.845" OAL
Berger 140 gr. LRBT - 2.838" OAL
Lapua 139 gr. Scenar - 2.808" OAL

The difference in the throat datum of the two reamers is 0.105"

If I understand correctly, that means you can add 0.105" to the above numbers and be in the ballpark.

That would equate to the long reamer loaded rounds at:

Sierra 142 gr. MatchKing - 2.950" OAL
Berger 140 gr. LRBT - 2.943" OAL
Lapua 139 gr. Scenar - 2.913" OAL

I'm NOT certain that I am correct. If someone can double check me, I'd appreciate it.

 

[dennisinaz]

And this is better than the 260AI how?

 

[wwbrown]

Dennis,

Is it better? Hard question to answer, it is definitely different and that offers some cachet on its own. In our quest for accuracy many of us have taken wrong turns hopefully fewer wrong than right, but many of us like to keep turning and we determine for ourselves if it was a right or wrong turn.
wade

 

[xdeano]

velocity wise it isn't better. Fire Forming and wasting barrel, components and time it is worth it. Depends on how what you want to waste your time doing? Fireforming or shooting for score.

xdeano

 

[1shot]

I will tell you all this. After shooting this cartridge since it's infancy, (then called the 6mm Super-X) you can shoot fireforming loads in a match and do very well with it. I should mention that I'm a sling/prone shooter that has a 2 moa window to work in. Having said that, I have shot mid-high 190's out of 200 at 1K with brand new W-W brass and 115 gr. bullets on more than one occasion. Is it the end all Holy Grail of cartridges? Nope. But, I’ll bet it out performs the ability of most of us using it.
I hope this helps,
Lloyd

 

[daj]

.........I'm NOT certain that I am correct. If someone can double check me, I'd appreciate it.

Figures are right on.

I didn't have any 140 VLDs on hand to measure when I posted but found the ogive measurements in Bryan Litz' book "Applied Ballistics For Long Range Shooting".

Neither the long nor the short reamer is going to give me a suitable COAL for a 2.95" mag. Looks like PT&G will have to custom grind back a long reamer for me.

 

[dennisinaz]

I will tell you all this. After shooting this cartridge since it's infancy, (then called the 6mm Super-X) you can shoot fireforming loads in a match and do very well with it. I should mention that I'm a sling/prone shooter that has a 2 moa window to work in. Having said that, I have shot mid-high 190's out of 200 at 1K with brand new W-W brass and 115 gr. bullets on more than one occasion. Is it the end all Holy Grail of cartridges? Nope. But, I’ll bet it out performs the ability of most of us using it.
I hope this helps,
Lloyd

you are talking about a completely different cartridge. The 6.5 Super is as it's name suggests, a 6.5 or 264 cal. You are referring to a 6mm or .243 cal cartridge.

The case length and apparent COAL should be the same for the 260, 260AI and the 6.5 Super. The issue with AR platforms is the magazine length. I guess if you can run a case into a sizing die and it is 100% to volume then it is an advantage over the 260AI. I have taken to using COW method for fire-forming the 260AI and do 100 at a time. I am going to chamber a second barrel JUST for fire-forming I guess.

I get near 6.5-284 velocities from my 260AI and accuracy is as good as anything I have shot. If this Super is all that it will be a good round.

If it is your choice of cartridge in a gas-gun for other than the fire-forming issue you would be better off to go the 6.5 Creedmoor route as it has shorter, fatter case and more conducive to shooting 140 VLDs and such.

I am in the process of building and AR platform 6.5 and am waiting on my barrel. I will probably chamber it to 260AI since I have that reamer. If it doesn't feed, I will set it back and go the Creedmoor route. Probably will be a PITA to match the gas port up a second time but I like the challenge.

 

[1shot]

dennisinaz,
Your are completly right. I saw the Super LR part and just wasn't paying attention. My apologies if I threw anyone off track.
Lloyd

 

[ohnomrbillk]

.........I'm NOT certain that I am correct. If someone can double check me, I'd appreciate it.

Figures are right on.

I didn't have any 140 VLDs on hand to measure when I posted but found the ogive measurements in Bryan Litz' book "Applied Ballistics For Long Range Shooting".

Neither the long nor the short reamer is going to give me a suitable COAL for a 2.95" mag. Looks like PT&G will have to custom grind back a long reamer for me.

I'm pursuing a 6.5 for that same COAL of 2.95" for the AICS magazine. If you use the throat of the Short version of the 6.5 Super LR and place it on the 6.5x55 BJAI cartridge, you are very close.

Have you considered that?

 

[boltfluter]

dennisinaz,

Would you care to share your fireforming load with COW. I am in the process of building a .260AI for myself. Thanks.

Regards, Paul.

www.boltfluting.com

 

[daj]

.........I'm NOT certain that I am correct. If someone can double check me, I'd appreciate it.

Figures are right on.

I didn't have any 140 VLDs on hand to measure when I posted but found the ogive measurements in Bryan Litz' book "Applied Ballistics For Long Range Shooting".

Neither the long nor the short reamer is going to give me a suitable COAL for a 2.95" mag. Looks like PT&G will have to custom grind back a long reamer for me.

I'm pursuing a 6.5 for that same COAL of 2.95" for the AICS magazine. If you use the throat of the Short version of the 6.5 Super LR and place it on the 6.5x55 BJAI cartridge, you are very close.

Have you considered that?

Isn't that going to severely handicap the capacity of the 6.5x55 BJAI?