|
S |
M |
T |
W |
T |
F |
S |
|
|
|
|
1
|
2
|
3
|
4
|
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
|
26
|
27
|
28
|
29
|
30
|
31
|
|
|
|
3 members (WJW, mark, Argo44),
277
guests, and
5
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
Forums10
Topics38,563
Posts546,370
Members14,423
| |
Most Online1,344
Apr 29th, 2024
|
|
|
|
Joined: Dec 2001
Posts: 12,743
Sidelock
|
Sidelock
Joined: Dec 2001
Posts: 12,743 |
It is quite true that Black powder is quite capable of building excess pressure. However, the vast majority of cartridges designed for black were designed for all the powder the case would hold up to the bullets base, usually compressed somewhat. Normally there simply is no place to put an overload. In fact even with old style baloon head cases most find it difficult to get the amount the cartridge's nomenclature would indicate. Did you ever try to drop 70 grains of black into a .45-70 case & then try to seat a bullet for instance??
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
|
|
|
|
|
Joined: Jan 2006
Posts: 15,456 Likes: 86
Sidelock
|
|
Sidelock
Joined: Jan 2006
Posts: 15,456 Likes: 86 |
|
|
|
|
|
Joined: Dec 2001
Posts: 12,743
Sidelock
|
|
Sidelock
Joined: Dec 2001
Posts: 12,743 |
My 1889 Lefever Arms Co catalog recommends for a 12ga gun of 7-8lbs wt up to 3½ drams-1¼ oz. Then for 12ga 8-9lb guns up to 4½ drams-1¼ oz. You'll have a hard time getting any more than that 3½-¼ load into a 2 5/8" shell, with the heavier loads requiring long hulls. Other than muzzle loaders its generally hard to over load a black powder gun, because their shells were built around the correct charge & there's just no room left for extra.
I would not however recommend taking an old gun & loading these charges using 4FG priming powder, that might well lead to some fantastic pressures. In fact I would personally not recommend loading anything heavier than a 3-1 1/8 load in a 12ga with 3FG powder. Anything over this I would switch up to 2F or for the very heaviest ones in the long hulls even up to 1FG.
I do agree, Black Powder is capable of building considerable pressure.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
|
|
|
|
|
Joined: Jan 2006
Posts: 15,456 Likes: 86
Sidelock
|
|
Sidelock
Joined: Jan 2006
Posts: 15,456 Likes: 86 |
Before I knew better I wrecked a 12ga. Gibbs Jones under lever with 1 & 1/4oz of shot and 4 & 1/2 drams of FF Goex in just two shots....like some I was told too much black and it would just blow out the barrel.
|
|
|
|
|
Joined: Dec 2001
Posts: 12,743
Sidelock
|
|
Sidelock
Joined: Dec 2001
Posts: 12,743 |
Joe;
I don't buy that "Just Blowing out the Barrell" either. I am though somewhat surprised that load wrecked the Gibbs. In what way did it wreck it?
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
|
|
|
|
|
Joined: Jan 2006
Posts: 15,456 Likes: 86
Sidelock
|
|
Sidelock
Joined: Jan 2006
Posts: 15,456 Likes: 86 |
Bad off face in two shots.
|
|
|
|
|
Joined: Jan 2002
Posts: 5,954 Likes: 12
Sidelock
|
|
Sidelock
Joined: Jan 2002
Posts: 5,954 Likes: 12 |
Don,
do you mean to say that: if the pressure drops in the choke, there will be, effectively, no expansion (no change in strain value) of the barrel at the choke? Don, That is the reason Chuck and I need you to blow up a couple of guns for us!  Pete & Chuck. I don't envision blowing up any guns- yours, mine, ours, or theirs!! We need a very simple single barreled gun where we can have cyl and full choke. I'm imagining a a choke section like a very long extended choke tube. We need to provide a means to pressure calibrate strain gauges at all locations. Chuck, my chronois oldand hasn't seen the light of day in years (I've had easy access to betterinthe recent past, but not now), so, I'll check mine out and let you know if I need yours. I'm thinking a 10 shot series for each strain gauge with a common factory load. Six gauge locations on two chokes would be 120 shots. I'll provide ammo. Also, I'll capture patterns from each choke and we can see if Andrew Jones will run statistics on them. Chuck, what sort of computer will your pressure rig need? Pete, what do you have in mind for a gun?
|
|
|
|
|
Joined: Feb 2004
Posts: 13,880 Likes: 16
Sidelock
|
|
Sidelock
Joined: Feb 2004
Posts: 13,880 Likes: 16 |
Don, a simple laptop of windows OS, either XP, Vista, or Win 7 (32 bit only). The software can be downloaded here. http://www.shootingsoftware.com/ptsupport.htm
|
|
|
|
|
Joined: Nov 2005
Posts: 4,598
Sidelock
|
|
Sidelock
Joined: Nov 2005
Posts: 4,598 |
|
|
|
|
|
Joined: Apr 2005
Posts: 1,688 Likes: 31
Sidelock
|
|
Sidelock
Joined: Apr 2005
Posts: 1,688 Likes: 31 |
It has all gone quiet over here. Have people stopped sending guns to London for Proof?
Come on Diggory, what is the update?
|
|
|
|
|
