Sherman MEGA data
- Thread starter Sleepertruckguy
- Start date
7mm MEGA
initial Fire Forming load: 26in 1:7 twist barrel
Berger 190g
62g RL19 = 2,767 FPS
Spitzer 154g
67g RL19 = 3,122 FPS
Spitzer 154g
68g RL19 = 3,177 FPS
After resizing I'll be loading some berger 190 LRHT with N570 and will report back.
initial Fire Forming load: 26in 1:7 twist barrel
Berger 190g
62g RL19 = 2,767 FPS
Spitzer 154g
67g RL19 = 3,122 FPS
Spitzer 154g
68g RL19 = 3,177 FPS
After resizing I'll be loading some berger 190 LRHT with N570 and will report back.
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I don't even know what these cartridges are. Seems like the parent case is about 300WM sized, no?
No parent case. Rich from Sherman Wildcats had ADG make brass for him. Its more like a 7prc improved. I couldn't find any brass or ammo for 7PRC so I went with this. On paper it outperforms 7prc with heavier bullets and more speed. I'll post real world results next week as I'm starting load development Sunday. My goal is to push a Berger 190LRHT at 3100fps while holding peak accuracy. From left to right - SST (sherman short tactical), SS (sherman short), Max, MEGA, SM (sheman magnum, which is a 300prc improved case).
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Also known as Over Pressure Central with those Sherman boys…..
Have fun!!!
Have fun!!!
Berger 190 LRHT
Chamber cut with long action reamer (extended free bore)
N570 powder
70g - 3,030 fps
70.50g - 3,049 fps
71g- 3,074 fps
71.50g - 3,093 fps
72g - 3,119 fps (starting to see obvious signs of pressure)
73g- 3,135 fps over pressure
74g - 3,170 fps over pressure
75g - 3,215 fps extreme over pressure do not attempt this charge.
76g - did not attempt, most likely would blow primer.
Chamber cut with long action reamer (extended free bore)
N570 powder
70g - 3,030 fps
70.50g - 3,049 fps
71g- 3,074 fps
71.50g - 3,093 fps
72g - 3,119 fps (starting to see obvious signs of pressure)
73g- 3,135 fps over pressure
74g - 3,170 fps over pressure
75g - 3,215 fps extreme over pressure do not attempt this charge.
76g - did not attempt, most likely would blow primer.
So, all of this new-fangled stuff and the 40yr old 7 STW (with the correct twist and a little longer throat) can whip its ass with a full charge of US-869.
BTW, US-869 data looks like the old H-870 in a new package. 870 worked like a champ in that long case.
BTW, US-869 data looks like the old H-870 in a new package. 870 worked like a champ in that long case.
Ha! Come on buddy no one has pressure testing equipment on these threads. What’s your last name SAAMI?
You saw signs @72gr. But yet you fired all the way to 75gr.
Yer not gonna find much help here.
.02
Guys, this thread is quickly changing into something stupid. As stated in the tittle “load data for MEGA cartridges.”
Not…..”shit on wild cat cartridges.” If your a reloader, you’ve run into “pressure” during testing. This is nothing new.
Not…..”shit on wild cat cartridges.” If your a reloader, you’ve run into “pressure” during testing. This is nothing new.
Guys, this thread is quickly changing into something stupid. As stated in the tittle “load data for MEGA cartridges.”
Not…..”shit on wild cat cartridges.” I
Not…..”shit on wild cat cartridges.” I
Getting a bit redundant as well.
Myself and many others here have worked with wildcats for many years. Myself for 50 or so. I built 7mm’s on tne 8 Rem mag case as soon as it was landed.
You have a cavalier attitude towards excess pressure. Heed the warnings or pay the price.
I personally don’t give a fuck which route you choose. Drive on.
Myself and many others here have worked with wildcats for many years. Myself for 50 or so. I built 7mm’s on tne 8 Rem mag case as soon as it was landed.
You have a cavalier attitude towards excess pressure. Heed the warnings or pay the price.
I personally don’t give a fuck which route you choose. Drive on.
It was stupid when Sherman made its way into the title.
This thread is reloader depot, All reloading data gets listed here. If you’ve never run into pressure, then stick to factory ammo. I’m not some 13 year old kid playing with pistol powder. I’ve loaded everything from 223 Remington to 375 cheytac, and everything in between. We don’t need spell checkers mr casselton, and we don’t need people’s opinions mr tokay444.
again, if you’ve ever worked up a load, you’ve hit pressure.
again, if you’ve ever worked up a load, you’ve hit pressure.
New name should be “Half A Face”…….
Or “Kids, this guy died ‘chasin speed….’”
Booger Eater
Tip, that the rest of us know.
If/When you see pressure, you stop.
You dont go 3 MORE FULL GRAINS.
Tell us more about what a reloading genius you are.
Good thing Abn31c copied yer post 13 in post 18….
Or “Kids, this guy died ‘chasin speed….’”
Booger Eater
Tip, that the rest of us know.
If/When you see pressure, you stop.
You dont go 3 MORE FULL GRAINS.
Tell us more about what a reloading genius you are.
Good thing Abn31c copied yer post 13 in post 18….
Post 13 was a duplicate, it was meant to be a reply to tokay444. I don’t even know what you are referring to on this.
So let me ask you guys a question. When I see a light ejector mark (over pressure) should I not report it? When I see primers start to flatten out (over pressure) should I not report it? When I get a sticky bolt lift (over pressure) should I not report it? You guys are relentless.
So let me ask you guys a question. When I see a light ejector mark (over pressure) should I not report it? When I see primers start to flatten out (over pressure) should I not report it? When I get a sticky bolt lift (over pressure) should I not report it? You guys are relentless.
No. We aint.
Yer dumb. And then doublin down on it
My mistake on post 13.
Post 7 is where you show yer wizardry with the reloadin science.
This one.
Yer dumb. And then doublin down on it
My mistake on post 13.
Post 7 is where you show yer wizardry with the reloadin science.
This one.
To be fair to the OP, Sherman has duped alot of guys into buying his shit.
Here's a guy that's getting real pressure signs and notice the brain surgeon response..
Nuff said?
Here's a guy that's getting real pressure signs and notice the brain surgeon response..
Nuff said?
Maybe Max means rifle primer blows by Stubby Dick Sherman way of thinking?
Of course I only shoot a Red Ryder and an inaccurate .22, both poorly, so what do I know?
Of course I only shoot a Red Ryder and an inaccurate .22, both poorly, so what do I know?
It's Mr. Casselton, thank you very much.
And yeah, we do run into pressure signs, wildcat or not.
What most of us are smart enough to realize, is that once the pressure signs appear, you stop and reassess what's going on. You don't continue dumping in more powder.
What you're doing is unsafe and irresponsible.
If you had any idea of the pressure you're dealing with, you'd stop with this nonsense.
If you feel like this is my opinion, you're dead wrong. What I wrote is based on having manufactured ammunition for a living.
powdahound, cassleton, tokay, I’ve thought long and hard about what you’ve said, and from now on, I’m only posting crap data. I’ll no longer be letting people know the limits of wildcat cartridges I shoot. From now on, I’ll just be posting velocity and powder charge. If someone gets hurt in the process, so be it. I know the risks. Others don’t. So reloader’s on the hide beware. You can post your data, just don’t let anyone know you ran into pressure or you’ll be cancelled by Whoopi Goldberg (Mike cassleton), Joy Behar (Tokay444), and Sunny Hostin (Powdahound76).
Do us an actual favour, and don’t post at all.
Dude, guys have been pretty kind to you. I feel you just can't help yerseff.....
I think this lot lizard sleepertruckguy may actually be Fetterman trying to load and shoot the Sherman cartridges….
We arent cancelling you.
We are letting you and others know that what you are doing is dangerous and foolish.
Yes, we all know pressure and have seen it.
Yer just being an absolute moron about it and then double down and exponentially increase your cranial rectal inversion.
Have fun dying or losing an eye.
If you want a mod here to scold us, lemme tag one in for ya @MarinePMI
We arent cancelling you.
We are letting you and others know that what you are doing is dangerous and foolish.
Yes, we all know pressure and have seen it.
Yer just being an absolute moron about it and then double down and exponentially increase your cranial rectal inversion.
Have fun dying or losing an eye.
If you want a mod here to scold us, lemme tag one in for ya @MarinePMI
But wait, he's gonna post some crap data.....
And he did mention Mike...aka whoopie....
And he did mention Mike...aka whoopie....
Any Hider’s dump after hitting taco bell and drinking too many beers.
Thanks for making this about poop. Really makes my day
And then keep going, the Sherman way. But don’t do any actual pressure analysis. And if you do, keep it a secret.
- Nov 3, 2010
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The first rule of Sherman Club is, you do not talk about pressure.
The second rule of Sherman Club is, YOU DO NOT TALK ABOUT PRESSURE.
The second rule of Sherman Club is, YOU DO NOT TALK ABOUT PRESSURE.
No scolding from me. I think the posts made by members have illustrated the danger in using the OP's load data and methods.
I do think the missing info to his "load data" is how much free bore he actually had cut into the throat. Just like Weatherby cartridges, excessive freebore can gain you a fair amount of velocity by trying to flatten the pressure spike, but this is physics. There is no free lunch. Excessive freebore buys one extra velocity, until it doesn't...often times, catastrophically.
I'm embarrased to admit this, but I dabbled with these wildcats. If you don't meet or exceed "advertised" velocities and inquire as to "why", one or more of the following generally happens:
- "Add more powder ya pussy!" - as seen above
- BANNED from the FB page
- Barrel manufacturer is blamed - i.e. Proof Barrels
- Reamer is faulty
- Sizing die is faulty
- Your brass is crap
- Powder lot is suspect
Fortunately, this BS is really only allowed to propagate on Long Range Fudding and FB. Regarding physics, they don't apply to these wildcats, apparently.
- "Add more powder ya pussy!" - as seen above
- BANNED from the FB page
- Barrel manufacturer is blamed - i.e. Proof Barrels
- Reamer is faulty
- Sizing die is faulty
- Your brass is crap
- Powder lot is suspect
Fortunately, this BS is really only allowed to propagate on Long Range Fudding and FB. Regarding physics, they don't apply to these wildcats, apparently.
I'm running a 30 SM. I did a ladder test up to what Sherman says the max was and I was getting much better velocity than I expected but no pressure signs, that being said the case was full, I decided on a velocity I was happy with which is 4 full grains down from his max.
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