5.56 Load to Hot?

[Forewarned]

Has anybody loaded a 5.56 round with 26gr of Tac and a 62gr bullet? If you did was everything OK? When I did the brass and primer looked OK but I broke the ejector in my AR. I'm not sure why it broke but maybe the load was too hot? Looking at the load data I thought it would have been OK. My standard load is 25gr of Tac, I was just working up a max load. If it matters the rifle is a piston LMT MRP.

[sk8804]

how many rounds are through the gun. I am just thinkin it was mechanical failure not ammo loaded hot. What does the primer look like?

[nmerced]

You're over the max load. According to the Ramshot TAC manual, max load for a M855 62 gr bullet is 25 gr.

[smalltime]

Loads sound hot, data from Ramshot:

223 Pressure:

TAC 62 MIL M855 22.5 2,800 25.0 3,078 54,947 2.260
TAC 62 MIL FMJ 22.3 2,825 24.8 3,084 54,787 2.223

NATO/5.56 Pressure:

TAC 62 MIL M855 23.6 2,940 26.2 3,219 62,350 2.260
TAC 62 MIL FMJ 23.3 2,935 25.9 3,217 61,977 2.223


Taken from http://www.ramshot.com/wp-content/up...dgun_rifle.pdf

[Forewarned]

Probably around a thousand to fifteen hundred rounds though the gun. Nato max load shows to be 26.2 gr.

[popeye4]

Probably around a thousand to fifteen hundred rounds though the gun. Nato max load shows to be 26.2 gr.

Yes, but every gun is different (including the ones they use to develop load manual data) and you need to watch for pressure signs as you approach the upper limit. There are several indicators of high pressure, any one of which should set off alarm bells.

That being said, I've never heard of an ejector being broken by a hot load (but I have not heard of everything in the world!). The AR ejector is a plunger type, I'm not sure high pressure would affect it before other components.