quote:

Originally posted by starmetal:
I'm just saying I bet you and Pat don't know what K he set for it.

quote:

Originally posted by Pat I.:
Larry, I don't really want to drag Bill Alexander into this because he seems like a pretty smart guy and doesn't list what I would consider to be hot loads on his website, plus he never came right out and told me I didn't know shit.

quote:

Originally posted by Pat I.:
I don't really care about the history of the 6.5 Grendel but thanks anyway. I don't think a cartridge designer sets the pressure. I'm sure it's decided by the strength and design of the rifle and one makes the cartridge and load work within those parameters.

Once again wasted sarcasm. Do you ever just answer a question or could it be you don't have a clue. How bout just a straight answer for a change: What's the max pressure in the Grendel?

You don't have to be a 6.5 Grendel guru to know that 25 grs of 4198 in a case that probably has about 35 gr water capacity is a little on the warm side. If someone told me they were going to load 60 grs of 4198 in an 06 with a 200 gr bullet I think it'd be safe to say that was a little warm too without being an 06 expert.

quote:

Originally posted by Larry Gibson:
Starmetal

Well, knowing you post as "old Joe" over on the Grendel forum it wasn't all that difficult to research. I really don't know why you have to be such a "drama queen" and just didn't tell us. What's the big deal anyways? You have to string everything out by counter questioning a simple question instead of answering it. I read numerous of your posts/threads over there including the one on your "dream of 2500 fps" with that Saeco cast bullet. You didn't quite make it there and several challenged you there as we are here. You backed out of that thread also. I did really like your last post on that thread;

"The hard part of 3000 fps in the .264 with cast is the darn fast rifling twist. Take the Swede for example with a twist of about 7.5 or little more. That's a lot of twist. Take a 30-06 with a 10 twist shooting a 150 gr bullet at 2700 fps. The spin on that bullet is 194400 rpm. Now change that to a Swede with the 7.5 twist and same velocity you get 259200 rpm. That's a lot of stress on a jacketed bullet alone a cast one.....You are correct about the tensile strength of cast bullets....Joe"

Damn Joe, that sounds an aweful lot like an "RPM threshold" excuse

However, while that is the point of this thread it is not the point of this post. Here's what you Bill Alexander had to say;

"As for loads that are too hot, I always get quite amused at this subject. I read all sorts of stuff about looking at primers, ejector marks and case head expansion and still see this in gun magazines. The basic rule of thumb is that visible signs start at 58,000 on most average cartridge cases, but it is entirely dependent upon the load. The Grendel runs MAP of 50,000 so should never show any visible signs of pressure, but I have seen verified loads from the pressure breach leave extractor marks from the accuracy test gun. Best rule, extrapolate a little from the load data but not a lot.

Bill Alexander""

The "50,000 psi MAP" is further backed up by this post;

"The 6.5 Grendel is derrived from the 7.62x39 Russian cartridge (as is the 6mmPPC) and uses that bolt face. Do a search on this site and you'll find that Bill Alexander has stated 50,000 psI as a maximum pressure for the 6.5 Grendel. The CIP max pressure for the 7.62x39 is 3550 BAR or 51488 PSI. For the 5.56x45 NATO it's 4050 BAR or 58740 psi"

But again all this thread isn't about "pressure" and that's not Pat's real question or mine. This is all a "red herring" you keep throwing out knowing we are interested in your accuracy claim. I also noted on your thread on the Grendel Forum that you claimed a 1 1/2" group at 300 yards with that Saeco cast bullet. That's the real point here; accuracy

I, like Pat, am just not believing that level of accuracy with your cast bullet at 2380 fps give or take. So why don't you make a date to shoot with Pat. Hell, if it works out I might just take a vacation and drive back there and shoot with you guys. We can slap a strain gauge on your Grendel AR, hook it up to the Oehler M43 and then really see what pressures you run at. How about that?

Larry Gibson

quote:

Originally posted by Pat I.:
"Oh and Patty I'm not banned on the 6.5 forum"

You crack me up. A simple check shows they just let you back on probably because you went crying to the bosses, sorry, I mean because they missed your insights so much they called and begged you to come back. I do see you have a couple of guys hoodwinked over there but mark my words it won't be long before you're off again. There's an old saying that was invented just for people like you "You can fool some of the people some of the time but you can't fool all of the people all of the time"

quote:

Originally posted by 303Guy:
Time to have a ....