TERMS AND PHRASES EXPLAINED

[ron169]

glad to see my thread has survived even with my absence

[68WJ]

glad to see my thread has survived even with my absence

Maybe you should hang around more, but at least it is stickied in lieu of your presence.

[harris hawker]

i have a few questions about abreviations.
MOA= minute of angle.
Can someone PLEASE explaine what this means to me?!
it sounds like grouping to me, but MOA seems to be used in scope reference as well as grouping.
how is it calculated?
or is it just a new more fancy way of grouping?
thanx a ton.
very good thread!

[Livnoutdoors68]

MOA is commonly measured at 1" at 100y-* actual number is 1.047" @ 100y* A circle is broken up into 360 degrees, a "minute" is one 60th of one of the 360 degrees. If you started that angle at the muzzle and extended it out to 100 yards, the measurement would be just about 1" @100, 2" @ 200, 3" @ 300, and so on. It's technically not a size at a certain distance, its an angle that translates into a size at a certain distance.

[harris hawker]

MOA is commonly measured at 1" at 100y-* actual number is 1.047" @ 100y* A circle is broken up into 360 degrees, a "minute" is one 60th of one of the 360 degrees. If you started that angle at the muzzle and extended it out to 100 yards, the measurement would be just about 1" @100, 2" @ 200, 3" @ 300, and so on. It's technically not a size at a certain distance, its an angle that translates into a size at a certain distance.

i work in an engineering department, so i have a solid understanding of deg, min and seconds.
but the 1.047 over 100 yards, 3600 inches(36 inch in a yard x 100 yards), is .016 degrees. cause 1 deg over 100 yards is actually 62.83 inches.
now that i just did the math, i am truly impressed with a bullet and its trajectory.


so is the 1" over 100yards a standard that bullets shoulld/could hold?
i understand when sighting in a scope 1 click = X amount over X many yards depends on gearing or what ever they use to move the crosshair.

appreciate the response.
i guess let me ask this.
will a solid understanding of MOA improve any of my accuracy?
is there something on the Ammo box that will tell me to adjust my scope any number of clicks to shoot better?
or are trips to the range always the best way?

[angsniper]

An understanding of MOA can help you improve your accuracy in terms of bullet drop and wind drift.
There won't be anything on the box but you can multiply the distance by the click value. ie: 1/4 x 300yds means your click value is now 3/4 moa per click.

[snyderiii]

Spending deployed time learning and then buying, so i can pull up to my driveway with a couple boxes of parts waiting on me (and not miss a day of hunting season)...
6.8 ARP-16" Scout profile 1lb 12oz, 5R rifling, Melonite, mid gas
6.8 ARP-18" SPR profile, 5R rifling 4150 CMV Melonite, mid gas
My question pertains to barrels:
Granted, one of these are 16 and one of these are 18, but how or why do i care about a barrel being an SPR (I read about it, but don't know that I understand the impact to my build). I see the designation and read about what it means but it appears this is more about the manufacturers process. If its a midlength with an 0.750 diameter, that's all that seems to matter to the guy building (i.e. me). But then again, I could be missing something here.
Also, what do they mean when they say "scout" profile. In the 5.56 world (at least mine), I've built (and adore) a few guns with what I commonly call (cuz someone else told me to call them) "pencil" barrels. These have a much lower profile are therefore lighter and unfortunately become more difficult to find the right size gas block for.
Thanks again.

[WVHunter1s1k]

HH - MOA = http://www.youtube.com/watch?v=VA2PZBD5Tjg
Many scopes will say 1/4 or 1/2 MOA/ click adj. It may help you with scope adj. at distances beyond 100 yards at the range & relate it to the field?


Snyderii = .750 is needed to know when buying the gas block. It is the diameter at that part of the barrel. The 18" SPR has a .750 dia. at the gas port. The 16" does too?
Here are BHW's barrel profiles http://blackholeweaponry.com/Profiles.html
The SPR is similar to the Standard. I could not find barrel profiles on the ARP website. He used to have them on there. You might want to PM or email H & ask what the 2 barrel profiles are.
Neither profile will effect a FF Rail. It just the larger the dia. the more weight on the barrel.

[dark1]

If you go up BBL is explained. It is barrel. And on clip I hope you are referring to the box that feeds ammunition in to the riffle as a clip because it is a Magazine not a clip

[68WJ]

If you go up BBL is explained. It is barrel. And on clip I hope you are referring to the box that feeds ammunition in to the riffle as a clip because it is a Magazine not a clip

That was a spammer. He is...no more.