Home Forums Hunting & Shooting AR and Tactical Rifles 556 + 62 grain M855

Thank you Swifty

and if thats quickload I'd far from trust any of it. Seems on blind stuff we have to back up to known and adjust stuff by percentages... FYI.

You would think you could equal it. You may or may not. And just variations of where MV is read, chrono variances etc... I used to run federal match 22lr over mine before I shot for record so to speak to verify it was still correctly calibrated...

The man asked a question, I gave an answer, nothing more nothing less. Didnt ask anyone to trust it.
Fact is I have shot that load in LC brass without the mag primer and it was shall we say on the warm side.

Dont know if this helps you or not, but Hornady lists H335 with their 62gr fmj under their 556 nato data. Max is 25.4gr with a winchester small rifle primer good for over 3000fps thru a 20" barrel.

Fellers, come on.

I'm not looking to run a load generated by quickload. I wanted to know what pressure I'd be at, at that velocity, with that powder, to have SOME sort of idea what territory I'm venturing into on a workup. Rost doesn't trust QL...well I don't exactly trust "pressure signs" either. Mostly if they show up late to the party.

I have trouble running Hornady's site on this device. Do they give a pressure on that?

Never thought you were. I dont trust predictive software 1 iota, its fun to play with. When your pressure limit is 62K and it predicts 59K well folks thats a damn fine line.
I wouldnt trust Hornady data on anything.

no pressure listed but its listed under their 556 nato data in the 11th handbook. Intro to the nato data says loaded to 60,000psi, specifically for nato chamber only

Here is what I did
I found H335 on Hogden's web site. For a 62 grain bullet they have one load under .223. Their top load is 21.4 grains for 53600 PSI. I divided 53600 by 21.4 and came up with 2504.672897196262.
https://hodgdonreloading.com/rldc/


I multiplied the 2504.672897196262 times 24.5. The 24.5 is the load my friend uses. The end result is 61364.48598130841. In other words, just under 61370 PSI.

This is just one way I figure pressure. Other places may have it listed but this is the only one I can find and I did my own fuzzy math to determine pressure

Check Ramshot Xterminator and AA2230. Both are in the same burn rate and both are owned by Hogdens and are listed with Hogden's load data.

My friend claims he has seen no pressure signs so proceed with caution.

kwg

In case you didn't realize, I was simply adding to. Not at all doing whatever you think I was.

We have used it a lot. I don't have it but a friend does. Its pressures and speeds have been not even what I would call ballpark on non normal stuff.

I agree pressure signs can be tough sometimes. But you play with both and you get an idea. I suppose I was not clear on that. You can start with QL. We did with subsonic stuff. First round was 400 fps and stuck in the bore on a 300/221. It was calculated at 950 fps. But once you use both and trust neither totally you kinda get the idea.

Work it up. See what it says. I've shot 60,000 psi loads and burned out more than a few tubes doing it and never had a single issue.

ANd thankfully this conversation drug out the fact you shot it and verified it as WARM. Thats good info to go along with what QL predicted. I have seen QL pretty much spot on too. But like Sierra game kings its performance can be all over the place.

Well, with a side eye given to the QL stuff I started sneaking up on my target velocity of 2940 or so. 24.5 gr of H335 in my barrel gives 2910 fps, and 25.0 gr gives 2975 in this LC brass. So somewhere in the middle of that is my dupe load for NATO green tip and I'll be happily well under the NATO charge of 26.1 gr of wc844 . Primers are fine, and no signs of pressure. We'll get er dialed in shortly.

Oh, and absolutely LOVE that new Garmin chrono......