Home Forums Hunting & Shooting AR and Tactical Rifles My PSA build

Have shot lots of both propellants and I like my lips more than that.

No thanks.

Hint.................

For perspective,on a burn rate chart(ascending fastest to slowest burning rates)...2460 falls at #86,Tac at #88 and Lever at #107.

Hint.

Just sayin'.

Thank me later...................

Hint - that's why being overgassed is a problem with Lever. If you care about having a rifle that's tuned right.

Those were max loads from Ramshot's 5.56 data. Smokin, but not over max, LC brass still lasted a bunch of firings. Too bad the accuracy wasn't there at those speeds in my rifle with those loads.

That does seem on the warm side of warm.

QL puts pressure in the 75K psi ballpark, for those speeds with those powders, from a 16" bbl.

Although I"m about at the point to doubt just about anything QL comes up with for their SWAGs.

I look at it, but I don't take it for hard truth either. It's just a prediction. Lot's of uncontrollable variables.

I'll go by published load data (like the Ramshot / Western Powders data I used) over QL any day. Don't really care what QL estimates to be honest, it's a pretty meaningless estimate unless correlated to other established loads for my particular barrel.

Note that most published data for these is for 223 Rem, while Ramshot has a separate section for hotter 5.56 loads.

I like published data too, and reference it when it's available.

But published data doesn't exist for a lot of combinations of case/bullet/powder, especially when you venture into the heavier bullets that are seated long.

True, but the Ramshot data does list that specific bullet and powder combo, and I worked up loads using both the Win cases and WSR primers they list, as well as my preferred LC cases and other primers. Other than chamber variations, that data was as specific for my load as you'll ever find. I'm not new to this; you can argue all you want about that load being too hot, but you're doing a lot more guessing than I did.

If you haven't used the Western Powders guide for their powders, I recommend it. It's more comprehensive data for a wide variety of bullets than most manuals, and is a better reference for their powders than any other data source I know of. It's a free download anyway.

I know Ramshot data lists that powder/bullet. But with a 24" barrel.

I use Ramshot data also, downloaded from the Western Powder data online. That's where I got my data for XTerminator.

So what is your point then?

Obviously I wasn't working up to 24" barrel velocity (they list 2,994 fps for TAC at max). My loads were also about 0.5gr less than their listed max, because that's where my rifle and components were telling me to stop.

My only point is that getting a 75gr to 2850 fps in a 16" 5.56/223, is going to require some pressure.

Warm side of warm.

From what I understand, velocity is a good proxy for pressure.
If a manual shows X grains give N velocity and you get the same thing, your pressure is the same too. But if you get N+ something velocity, your pressure is greater than they got in the test barrel. There is no free lunch.

Of course, you have to adjust velocities for barrel lengths and in the end brass condition rules. I'd run brass at 75K psi if I could still get 6 loads out of it.

I already said those are max loads for my rifle but with good brass life. At best maybe you're restating the same thing I said, but it sounds more like you're doing the armchair quarterback thing and pretending you know better without actually being there and seeing the results. What makes you think you know better than both me and the published Ramshot data? Do you have some special 16" barrel 5.56 pressure data for this bullet and powder combo that says otherwise? Post it here please, let's see it.

I care most,about my lips staying hooked to my face.

Hint..................

You seem upset.

I'm not bothered by your claims. If they are true, you are working with some high pressures.

It's just an observation, not a critique.

It's a Time Bomb.

Hint................

If one looks at some of the warmer 75/77gr loads from IMI, Hornady Superformance, Black Hills, none of them are even close to 2850 from a 16" barrel. More in the 2630-2730 fps range.

I'm familiar with the chambering,the platform and propellants cited...which is why I simply cited burn rates as THE reddest of flags.

It ain't my lips and I'll happily watch the fhuqking show!...................(grin)