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Apr 29th, 2024
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Joined: Mar 2002
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Sidelock
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Sidelock
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I have read Sherman Bells articles on the 10 ga, but note that there are no Pb loads. I use Pb in my 12's for low pressure and think it would be perfect for the short 10's. I have used 7625 in my 10s ,but I have had some ignition problems.. I know 4756 and 7625 seem to be preferred, but I have a lot of Pb and think it would be a good choice between Clays and 7625 for 1 1/4 oz loads..
Has anyone had experience with Pb and worked up loads??
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Joined: Dec 2001
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Sidelock
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Sidelock
Joined: Dec 2001
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Leighton, I don't have any data either. However, PB and 7625 seems to have similar (though not idential) characteristics. I wonder about using 7625 data but substituting PB and then sending five rounds to Armbrust for testing. Then you could begin tweaking the load. Fairly inexpensive and there's time since big bird season is soon drawing to a close. I really like PB in my 12 gauge for vintage loads so just can't see any reason on earth why it wouldn't work on the big boy.
When an old man dies a library burns to the ground. (Old African proverb)
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Sidelock
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Sidelock
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Sidelock
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Sidelock
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Why Pb? Pb means plumbum (lead), but BP means Black Powder.
Thumb rule is very simple, use as many BP (2F) you can pour under the shot and wads and make good roll crimp.
Geno.
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Sidelock
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Sidelock
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Geno you are quite correct Pb is the scientific designation for lead, however, the original poster was referring to a DuPont IMR powder designated PB.
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Sidelock
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Sidelock
Joined: Dec 2001
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IMR stands for Improved Military Rifle powder. 4756 & 7625 were classified by Duont as Sporting Rifle powders, thus SR. I believe that PB was classified as a Shotgun Powder. In any case the PB designation related to its mode of manufacture & stood for Porous Base. It is still a hard gelatinized powder, not a fibrous powder as was the old bulk EC, but has itty-bitty holes in it.
It should give much cleaner & more efficient burning under low pressures & cool temps than either of those SR powders. PB is a faster powder than 7625, I would definitely cut the charge wt from a 7625 load.
The 10ga bore has 13% more capacity than the 12ga. Personally I would feel much safer to find a 12ga load using PB with 1 1/8oz in the desired pressure range & then loading 13% more powder with the 1žoz in the 10ga, than in trying to work with 7625 loads.
Green Dot is a very efficient powder in a similar burn range to PB. It normally uses a lighter charge wt & also usually can be found for lesser $ per lb.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Sidelock
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Sidelock
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My early 50's lyman Handbook recomends 27 grains of red dot for 3 3/4, 1 1/4 oz 10 bore loads. This was with card wads. They don't seem bothered by the lack of PSI or FPS data however they called for 70 psi wad pressure. I note that many people don't seem to realize that wad pressure was critical on paper hull, paper wad loads.
bill
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Sidelock
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Sidelock
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Bill;
An old Lyman Handbook of mine dated 1951 gives 24 grs Red Dot as 3 DE with from 1 to 1žoz shot & 26grs for a 3žDE load with 1 1/8oz shot, all in 12ga. 24grs & 1 1/8 plus 13% is extremely close to the 27gr- 1žoz load in the 10ga. A late 50's Lyman handbook had dropped the heaviest load of RD in the 12ga to 23grs-1 1/8oz for 3DE.
Not positive but I think they received a lot of their shotgun data at that point in time directly from the powder makers.
Miller/TN
I Didn't Say Everything I Said, Yogi Berra
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Sidelock
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Sidelock
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IMR stands for Improved Military Rifle powder. 4756 & 7625 were classified by Dupont as Sporting Rifle powders, thus SR. I believe that PB was classified as a Shotgun Powder. In any case the PB designation related to its mode of manufacture & stood for Porous Base. It is still a hard gelatinized powder, not a fibrous powder as was the old bulk EC, but has itty-bitty holes in it.
It should give much cleaner & more efficient burning under low pressures & cool temps than either of those SR powders. PB is a faster powder than 7625, I would definitely cut the charge wt from a 7625 load.
The 10ga bore has 13% more capacity than the 12ga. Personally I would feel much safer to find a 12ga load using PB with 1 1/8oz in the desired pressure range & then loading 13% more powder with the 1žoz in the 10ga, than in trying to work with 7625 loads.
Green Dot is a very efficient powder in a similar burn range to PB. It normally uses a lighter charge wt & also usually can be found for lesser $ per lb. I shot many rounds of trap last summer through a twist barrel Parker using Federal hull trimmed to 2 7/8", Win 209 primer, 22 grains of green dot, SP10 wad, enough 16ga filler wad to make a good crimp (about 1/2"), 1 1/8 ounce of lead shot, star crimp. This is a very comfortable and effective load but it is of my own design and has not been pressure tested by anyone I know. My logic is there are similiar 12ga loads of that amount of GD and shot and the 10 gauge is going to have less workign pressure due to bore size. Works great for me, use at your own risk.
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Joined: Mar 2005
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Sidelock
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Sidelock
Joined: Mar 2005
Posts: 680 |
IMR stands for Improved Military Rifle powder. 4756 & 7625 were classified by Duont as Sporting Rifle powders, thus SR. I believe that PB was classified as a Shotgun Powder. In any case the PB designation related to its mode of manufacture & stood for Porous Base. Miller I think you are correct on the origins of PB, however, today it is marketed as IMR PB.
Last edited by TwiceBarrel; 01/18/11 02:01 PM.
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