Green Dot Pressures

[Southern Shooter]

Can anyone give an estimation of what pressure is being generated with 7.5 grains of Green Dot behind a .45 caliber 255 grain boolit?

Thanks

[GhostHawk]

Just as soon as you tell me what manual you got that load out of.

[Southern Shooter]

Well, it is not in any reading material that I possess. Hence, my asking if someone here might have an idea based on their more advance knowledge and experience.

[Screwbolts]

Can anyone give an estimation of what pressure is being generated with 7.5 grains of Green Dot behind a .45 caliber 255 grain boolit?

Thanks

IMHO, no one can because you are simply asking a way to open question.

Please take a moment and ponder this, the available space in a given cartridge for a said powder charge will greatly influence its burn rate characteristics.

Could be enough to make pieces out of the barrel, or might be a squib in another larger capacity case.

Ken

[Southern Shooter]

Ok. Thanks.

I guess my main concern is if this charge would be at or below 14,000 psi.

[Screwbolts]

And so you still you leave out the application cartridge you were asking about. Laughing out Load!!!! As I see it it could be a Webly, Gap or a 45-120 or any other 45 cal. in between, or maybe a new wildcat short thingy. WOW

[Southern Shooter]

Perhaps, Screwbolts, stating directly the information you need would be helpful. I am not a mind reader. Nor, do I appreciate petty sarcasm or jeering.

I did not grasp that you were asking for the specific caliber. My apologies. It is a .45 Colt using the Lee 452-255-RF.

[RobS]

I have shot 6.5 grains of Promo under a 260 grainer with with no problems in a Ruger FlatTop small frame. My reloading manual as 7.0 grains with 250 grain RF. I would look toward 830 fps or so and you'll be in standard 45 Colt pressures (14K or under). Don't know what revolver you are working with but 7.0 grains of GD should work.

[Southern Shooter]

Thank you, RobS.

I am using several Uberti revolvers and a S&W 625.

[Screwbolts]

Sorry I wasn't more clear. the cartridge makes a big difference.

In my oldest Lyman CB manual there list a lot of pistol loads for GD, page 170 is the 45 colt Data. Lyman 454424 boolit #2alloy. They start at 4.5 gr and publish a max load of 6.5. They listed, test firearm as: Ruger Black Hawk. I always felt this the origonal CB handbook was very generous.

Written when men were men and corporate lawyer was not thought of.

No pressure data in this caliber.

Your milage may very.

[Southern Shooter]

Thank you, Ken. That is helpful information to ponder. It is sad how the corporate lawyer issue has so muddied the waters.
--Brad

[bgmkithaca]

Quickload shows 22,000 psi plus for a cast bullet and near 29,000 psi with a jacketed bullet-way to hot for me.

[RobS]

I found more data and it shows 7 grains of GD for standard loads again with a 250 grain RF. For reference, the current online data base from Alliant for standard 45 Colt loads has a 250 grain SWC with 7.0 grains of Bullseye.

[Southern Shooter]

RobS, thanks for pointing out that data. I have overlooked it. Actually, I never thought of using Bullseye in .45 Colt. Is not Bullseye considered a bit hotter than Green Dot?

[RobS]

Bullseye does have more energy to it; it is a quicker powder.

[Screwbolts]

the original post states 255 gr. Quicker/hotter, all depends on the application, they, BE,RD and GD are all very close in some pistol applications.

Does it really have more energy or does it exert it at a different rate?

[Southern Shooter]

Hmmmmmmmmmmmm......good question, Screwbolts.
Could having more energy AND a faster rate of energy exertion be one in the same?

45 Colt 250 gr Speer LSWC Winchester CCI 300 Bullseye 7 gr 879 fps

45 Colt 260 gr Speer JHP Winchester CCI 300 Bullseye 7.1 gr 841 fps


Lyman CB manual there list a lot of pistol loads for GD, page 170 is the 45 colt Data. Lyman 454424 boolit #2alloy. They start at 4.5 gr and publish a max load of 6.5.

When looking at Bullseye and these loads, it seems that Green Dot could be slowly increased a half grain or so without any real concerns.

[runfiverun]

consider green-dot a slow lot of red-dot...

[Screwbolts]

I agree with RFR.

[tazman]

I have an Alliant manual from 2001 that lists Green Dot for 45colt.
6.8 grains as max with velocity of 855fps and a pressure of 12,300psi when used with a 250 grain lead boolit.

[bhn22]

Try Castpics for the information you need. You load would be considerably higher that 14,000 psi
http://castpics.net/dpl/index.php/reloaders-reference/powder-company-manuals/17-alliant-reloading-manuals

[JohnH]

My question is why 7.5 grains? Are you using the Lee dippers and don't want to have to weigh everything? (I understand that...) Are you using the RCBS Lil Dandy fixed rotor system? (I like that one too) Just curious, kinda strange to ask about a specific charge like that, especially knowing about where those two systems throw charges. Also keep in mind that the Lee 255 will seat deeper than a Keith style 250 SWC which will affect pressures. Fourth Edition Lyman Cast Bullet Handbook shows a max charge of 6.0 grains of Red Dot under the Lyman 452424 (Keith 255 SWC) Velocity of 780, no pressure data given, OAL of 1.575. The Lyman 452664 is a design similar to the Lee 255 with an OAL of 1.570 and shows a max load of Red Dot at 6.5 grains velocity of 836, no pressure shown. Yet the RCBS 452-270-SAA shows 5.5 Grains of Red Dot as maximum with a velocity of 780 and a pressure of 13,600. I'd shoot your load in a Blackhawk but not a Smith or a Uberti. I doubt it'd burst the Smith but why beat the horse unnecessarily. Just my take. This is one of the things I don't like about Lee boolits, not much data for them.