No the Molly has nothing to do with pressure because you would add more powder to get to the same velocity which equals the same pressure of a lesser load with more friction From my take on the earlier post it was due mostly to a short throat
“Stop the Hammering!”
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Yes, but, I don't use book data, for this cartridge. I did that once, from Hornady with RL26, with a starting charge and a 140 ELDM and could've blew my face off! New extractor, plunger & spring and all is better.
Yeah but that only works to a point right? Because if the round can't clear the force out of the barrel in the time-frame, the cartridge will expand to expend that energy. I mean theoretically what could be happening here is the round speed coupled with the overload is hampering the ability to expend all of the energy out of the barrel so in the interim the cartridge expands.
Possible? I'm a newbie to reloading just trying to walk the physics.
The Molly has very little to do with anything I believe it is more the speed or volume of powder plus the short throat just like when you jam a bullet it will raise pressures compared to jumping a bullet
Right. I think what I'm saying is the same thing, but that the Molly is acting like a bullet "Jam" (slower velocity as compared to what it should be) so that it's not exiting the barrel quickly enough, which in concert with the overload, raises he pressure.
But I 100% yield to your experience here.
If you have a shave load and Molly coat your bullets you can add a touch more powder and it will still be safe if you were
Just my opinion take it for what you paid for it but the way I am trying to understand what you were saying yes the Bullet is traveling slower but the reason it is doing that is because of less pressure due to less friction
Savage 12BVSS
Well-Known Member
For me it was an ejector spring and an extractor spring. Took the temper out in an instant, glad it was a strong action. I changed brass brand with same powder charge and pressure went high.
Just to explain what I'm talking about -- three cases:
1. There's nothing in the barrel at all and there's a slight overload. At this point, assuming it's slight, the energy can probably exit the barrel without case expansion. Clear channel to exit.
2. There's a bullet in the barrel that responds to increase in load (slight overload) at a non-impeded ratio/speed (non-Molly). At this point, with a slight overload, the bullet would move out of the barrel fast enough to let the energy escape without case expansion.
3. There's a bullet in the barrel that responds to increase in load (slight overload) at an impeded ratio/speed (Molly). At this point, which a slight overload, the bullet can't move fast enough out of the barrel to let the energy escape without case expansion.
I was saying, "Maybe it's #3".
Let me try to say it this way the bullet travels out the barrel before pressure can build because of less friction The Molly does not impede the bullet it actually lubricates between the bullet and barrel
AHA! Makes sense. Thank you.
whirlwindjml
Well-Known Member
Those would leave a welt huh.....i put one in a 4ft blow nozzle attached to a big industrial air compressor and shot my friend in the but crack once. We wernt freinds for an hour....
ronstone09
Well-Known Member
There are definite ejector Mark's on some of the cases indicating pressure ! You're probably experiencing hard bolt lift too ! If it were me I would back off my powder charge 1 grain of powder and recheck for pressure and chronograph to check fps
dennisinaz
Well-Known Member
I didn't read through this whole thread but I have built quite a few 6.5-284s. I have used (in recent years) 130, 140, 142 and 143 grain bullets. I have tried many powders. It has been my experience that getting 3000 fps with a a 26" or shorter barrel is not easy to do. Some barrels will do it. I can do it with R17 and MagPro.; neither of which are particularly temperature stable compared to really good powders. Right now I am using R26 and I am right around 2950. When I was shooting 1000 BR there were quite a few of us shooting 6.5s. NOBODY was much over 2900 even with 29-30 inch barrels. Best ES and accuracy nodes seemed to be in the 2900s. I ran VV N160 myself. Don't get hunt up on 3000 fps.
One of the best investments that I made, you can pull in about 5 seconds with very little effort. Down side is you have to buy collets for each caliber.
