[blazedawg1973]

Hello out there 6.8 fans!
My "handle" is Blazedawg1973. I'm relatively new to the AR world. Never shot a military type of weapon before, but I have grown up as a competative target and trap shooter since I was 13 years old (I'm now 35). I picked the 6.8 cal for a few reasons.... the reviews that I read in various tactical wepon magazines, the right ups I read on the internet, Future Weapons (T.V. show) on the subject of 6.8 vs. 5.56 rounds and their performance, and the recomendation of two of my friends ( a retired marine, and a Navy Seal Sniper), they both recomended the "upgrade" to the 6.8 round.
I do have a couple of questions.... reguarding a good deal on target ammo (for practice) in bulk, and where to get it.... and also how to go about "zeroing" my sights on my new XM-15 Bushmaster. Both of my friends are out of the country on mission right now, and I am unable to reach them for the technical procedure for "zeroing". If anybody out there could answer these questions in "lamens" terms I would appriciate it very much. Blazedawg1973.

 

[gdonley308]

+1 for SSA. Unfortunately cheap plinking ammo is not available for 6.8SPC yet but I encourage everyone to contact the various ammo manufacutres and express your desire for some.
As far as zeroing goes I have always zeroed my 5.56 carbines at 50yrds with irons. I haven't got my 6.8 upper yet but will most likely zero at 50yrds as well. It's something like .3" high at 50rds puts you dead on at 100yrds with 5.56 75gr T2 TAP in a 16" barrel, I hope it's the same for 6.8? Hopefully someone will chime in here who's done the 50yrd zero thing in 6.8.

 

[paulosantos]

Hello out there 6.8 fans!
My "handle" is Blazedawg1973. I'm relatively new to the AR world. Never shot a military type of weapon before, but I have grown up as a competative target and trap shooter since I was 13 years old (I'm now 35). I picked the 6.8 cal for a few reasons.... the reviews that I read in various tactical wepon magazines, the right ups I read on the internet, Future Weapons (T.V. show) on the subject of 6.8 vs. .553 rounds and their performance, and the recomendation of two of my friends ( a retired marine, and a Navy Seal Sniper), they both recomended the "upgrade" to the 6.8 round.
I do have a couple of questions.... reguarding a good deal on target ammo (for practice) in bulk, and where to get it.... and also how to go about "zeroing" my sights on my new XM-15 Bushmaster. Both of my friends are out of the country on mission right now, and I am unable to reach them for the technical procedure for "zeroing". If anybody out there could answer these questions in "lamens" terms I would appriciate it very much. Blazedawg1973.

Blazedawg1973, welcome aboard. Here are just a couple of things that I would suggest:

1. Your Bushmaster has a tight chamber and will not let you shoot the SSA Combat Loads. I would contact WOA (White Oak Armament) and send them your upper andthey will convert your SAAMI chamber to the SPCII Chamber. It is not that expensive to do. See this thread.
2. For zeroing your AR, the 50 or 100 yard zero are great. If you zero it at 50 yards, you will be 1" high at 100 yards and about 2" low at 200 yards. It is a very flat trajectory.
3. For ammo, contact SSA as they have some specials on some of the Pro-Hunters once in a while.

 

[gdonley308]

Paul
So dead nuts center at 50yrds gives you 1" high at 100yrds this is with the 115gr or 110gr? Will the combat loadings show any different trajectory being hotter?

 

[paulosantos]

Paul
So dead nuts center at 50yrds gives you 1" high at 100yrds this is with the 115gr or 110gr? Will the combat loadings show any different trajectory being hotter?

A 50 yard zero with the SSA 115 Gr. SMK Commercial Loads:

Calculated Table
Range Drop
(yds) (in)
0: -2.6
100: 1.0
200: -2.8
300: -15.9
400: -41.3
500: -83.5
600: -148.2

A 50 yard zero with the SSA 115 Gr. SMK Combat Loads:

Calculated Table
Range Drop
(yds) (in)
0: -2.6
100: 1.1
200: -1.9
300: -13.4
400: -36.1
500: -73.7
600: -131.5

 

[blazedawg1973]

Thanks for all the useful information guys! I appriciate all the responces to my questions. It is great to feel that a rookie to the "AR" scene can ask questions, that others may feel is just common knowledge to the well versed, and not to be made to feel like an idiot.... thanks again.
Blazedawg1973

 

[gdonley308]

Paul
So dead nuts center at 50yrds gives you 1" high at 100yrds this is with the 115gr or 110gr? Will the combat loadings show any different trajectory being hotter?

A 50 yard zero with the SSA 115 Gr. SMK Commercial Loads:

Calculated Table
Range Drop
(yds) (in)
0: -2.6
100: 1.0
200: -2.8
300: -15.9
400: -41.3
500: -83.5
600: -148.2

A 50 yard zero with the SSA 115 Gr. SMK Combat Loads:

Calculated Table
Range Drop
(yds) (in)
0: -2.6
100: 1.1
200: -1.9
300: -13.4
400: -36.1
500: -73.7
600: -131.5

Yes thanks for the info Paul, looks to be the same formula as the 5.56 75gr TAP T2 from a 16" barrel. I usually bore sight at 25yrds, in my backyard, with a laser bore sighter and that puts me pretty close at 50yrds.

 

[Test_User]

Sorry I got to this late. Welcome aboard. lad you found us and I see you have already got a sample of the good help and info there is here for all to benefit from. Paulo is our resident Optics expert although I think he is to modesty to admit it. The man knows his aiming devices. For night optics HTR is the man. Feel free to jump right into the the discussions all are welcome.