Author Topic: 454 and heavy bullet (Read 658 times)

sideironjohn · « **on:** February 29, 2004, 10:48:34 PM »

Tried to post this a couple times now; maybe this will go thru.
My father has a 518g LRNGC he uses in his 45/70.
I'm trying to find some starting loads for him to use in his RB.
Any ideas/experience would be appreciated.
I'm hoping he can get 900 fps from his 8" bbl. :shock:

Graybeard · « **Reply #1 on:** March 01, 2004, 01:16:59 AM »

It posted yesterday or the day before but on the old server after we had moved to the new one. All such posts are now floating in cyberspace. I responded then but will again here.

WARNING: I URGE YOU IN THE STRONGEST TERMS TO FORGET THIS IDEA!!

You are courting disaster. A bullet of that weight is going to be extremely long and depending on the nose contour will leave extremely little case capacity to work with. You'll find no tested load data for such a heavy bullet and even if you did unless it was using the EXACT same bullet as you use it wouldn't be valid. You are planning something that is likely to blow up the gun. Don't do it

GB

sideironjohn · « **Reply #2 on:** March 01, 2004, 08:44:26 PM »

Wow. Pretty strong advice there. Not sure why this would be any more dangerous than working up any other load for which there is no data. Simply find the estimated safe zone, start low and work up.
Someone on another forum ran a quickload evaluation, and came up with something like 20g of H100 running something like 40k psi (don't quote me on that.)
Powley gave me an estimate of 1320 fps (!) w/36g of 4198, running about 48k, so it seems that somewhere in here is a workable load range.
Let me ask you this, since if I recall you have a 454 yourself.
*IF* there was a safe load of 518g RN going 900-1200 fps, would you be interested?

Graybeard · « **Reply #3 on:** March 03, 2004, 05:34:18 PM »

Nope. I can see absolutely no use I'd have for such a load.

I still say all that is giving you false information. Are you taking into consideration the reduced case capacity to seat such a long bullet and keep it in the cylinder? I think you'll find it physically impossible to fit the amounts of powder you have mentioned into the case and then to seat the bullet.

Again I say I have no clue what in the world you are wanting to do this for but I think you are going to blow up the gun. I sure hope when you do you have the courtesy to not sue the gun manufacturer for your own deeds.

GB

sideironjohn · « **Reply #4 on:** March 03, 2004, 08:59:36 PM »

I appreciate your concern for my safety as well as the financial security of Taurus. :wink:
Quickload is no end-all-be-all of load development, but it has made startlingly accurate predictions many times in the past. If you're not familiar with it, it's basically Powley's calculations, but with most modern powders added to the data pool. You give a case capacity, COL, bullet weight/design, pressure limit, caliber and bullet weight. It puts it all together and comes up with an estimate of how much of which powder you can burn behind the bullet for X psi, and what speed you can expect from your length of barrel.
I realize that a 1.24" bullet in a 1.77" cartridge doesn't leave much room for powder, about 12g in fact. And to squeeze 20g into that tight a space would be pretty much impossible. And right dangerous if you did manage to. I'll have to look again at the response.
But as a for instance, I've seen loads for the 480 Ruger using 7-8g of Unique with a 405g. So this isn't completely absurd. Just a bit odd.
But I'm all about odd.
If I can find a safe load of 518g/900 fps I'll definitely go shoot something with it.
:lol: