Ar15 primers 556/223

[mike a]

Sorry guys, ar dummy here. Going to use h4895 and 55grainers. What primers? I have s--t load of BR4s. Mike

 

[Rsadams]

I use normal CCI small rifle primers and haven't had a problem exept they are soft and can show flat primers at even medium charges... The br-4 has a harder cup so it will help with this and can even help prevent slam fires in the AR platform although I have never had that problem with the softer standered primers... So , pretty much whatever you have will work.... Some people use a magnum primer with ball powders and there are loads listed for these primers available but I don't use them and I use ball powders... Your br-4 will work fine... Just FYI , I do use a light crimp on my AR rounds to make sure the bullet doesn't move during function...

I use this as my basic AR round with no problems...
LC brass worked over well and shoulder bumped .003 with small base dies...
CCI S/R primers
TAC powder
Hornady 55gr fmj with the crimp ring...

You might want to look up what the pressure signs of an AR look like because they are a little different than a bolt gun...

 

[distinguished]

BR-4's will work just fine, though they are a bit on the expensive side for plinking ammo. I would avoid Winchester primers. I have had issues with them in the past.
I do not crimp my ammo and never had any issues.

 

[ToddKS]

If you are going to be dealing with brass that was formerly crimped I recommend Remington 7 1/2. They are harder than the CCI and won't smear if the crimp is not all the way out.

 

[theallcineyes]

all reliable reloading manuals list the components used to generate the data.
Gun vs universal receiver. BBL length.

Most primers are good to go
Rem 7.5 not the 6.5
CCI 400/450/41/BR-4
WSR
FED 205/ 205AR, 205M

Unless you are courting 5.56 velocities go with what you buy and work a load up with.

 

[mike a]

Thanx all, I'll just use some of my br4s. "Light crimp" got it. Zombies beware!

 

[Bc'z]

CCI 400, 450
Fed 205 ar match.
As per call to federal 205 ar match and 205 are identical save for ar match has a heavier cup.

 

[natdscott]

Remington 7.5 and CCI BR4 are the only ones I bother with for anything approaching accuracy in an AR15.

But it IS totally worthwhile to test between them.

 

[Rustytigwire]

F205 has worked fine (survived) all my couple thou newby loads. New, Used and pick up brass, some shoulda tossed out, several different powders. No piercing or severe material flow. Couple loose pockets were my fault.
No accuracy info to show or claim.
Strictly mechanical / reliability speaking they have been good.

 

[mac86951]

Sorry guys, ar dummy here. Going to use h4895 and 55grainers. What primers? I have s--t load of BR4s. Mike

BR4s are good; I've also had good luck with R7-1/2 and 450s. I've found they each have a different load, so I'd highly recommend different workups for each primer. Haven't noticed too much lot to lot variation on any of these.

I haven't tried Federals with h4895; I'll add that my current lot of 205Ms are reserved for my v-n140 loads, so Federal primers 205M and 205-AR may be good choices too


-Mac

 

[TheOtherZilla]

I use cci #41.

 

[Uncle Ed]

Read the link below, I had a SKS go full auto once and found the link below.

It is advised to use primers with a cup thickness of .025 in thickness to help prevent slam fires in semi-autos. The greatest chance of a slam fire in a AR15 is when cambering a single round in the chamber without the magazine in place to slow down bolt velocity.

NOTE, Remington ran Lake City Army Ammunition Plant from 1941 until 1984 and used the 7 1/2 primers in their 5.56 ammunition to light off Winchester ball powders. (subliminal suggestion)

Primer Info & Chart + Milspec Primers for Semi-Autos & Other Primer Applications
CHOOSING THE RIGHT PRIMER - A PRIMER ON PRIMERS
http://www.sksboards.com/smf/index.php?topic=56422.0

Below a CCI 400 with a cup thickness of .020 fired in a AR15, caused by excessive shoulder bump and head clearance.

 

[Rustytigwire]

Uncle Ed.
Boy howdy i have been schooled!
Excellent article, thank you for sharing.
Tom

 

[sdbob]

Pierced primers are no fun, been there. I run Rem 7 1/2 and not a problem since.

 

[flyingbrass]

CCI 450 and Remington 7 1/2 both have the same cup thickness. I don't know if I've had a couple bad lots of 7 1/2 primers, but with several different loads using different bullets and powders, velocity spreads have been much more consistent with the 450's. The 7 1/2's often have some really high and low outliers. This was using a Labradar chronograph.

I've also found that the 450s are slightly larger in diameter. Not by much, but when hand priming I feel that they are slightly more snug than the 7 1/2 primers in the same batch of brass.

 

[Pawnee Bill]

Switched from CCI BR to Fed 205 AR Match. Much better.

 

[243winxb]

Load an AR15 , eject the shell. Is there a firing pin dimple showing on the primer? This is the reason for the #41 primer.

There are so many brands and home built rifles with different parts, that it may be possible to have a round fire on chambering.


Edit/added- Always load rounds from the magazine. Never place a round in the chamber and allow the bolt to slam closed, is a general rule.

An AR Sled is used by many to load single rounds. http://www.originalbobsled.com/ARSleds.aspx

 

[mousegunner]

Tulas are good for me, thought about BR primers but I got the Tulas when they were plentyfull and cheap. Wish I had more but I'll probably get me a bunch of Rem 7 1/2 before 2020 just in case.

 

[AJC]

There are two episodes. I would be using the CCI 41 as i like CCi and they are made for using in the AR platform. I like videos because you get to see testing and watch the results on target

 

[243winxb]

I did a search at https://discover.dtic.mil to see how common a slam fire is in AR 15/M16 Types. 1968 data.

Slam fires can happen, but not common .