I think you found out what the old timers knew and is why they clung to thier 32/40s and 32 specials with 16" and 18" twists barrels when the 30/30 with 10" twist was new.
The BP fouling had greater effect on the steeper twist.
I think you found out what the old timers knew and is why they clung to thier 32/40s and 32 specials with 16" and 18" twists barrels when the 30/30 with 10" twist was new.
The BP fouling had greater effect on the steeper twist.
I thought that when using a duplex load that the smokeless is supposed to be fairly slow burning, and that most pistol powders were too fast. With that logic, wouldn't Trail Boss also be too fast a powder to use in a duplex load? I also understand that SR4759 is a good powder to use in a duplex load due to it's low pressure. Is that correct? Will duplex loads really cut down on fouling that much? And the most important question, would any of these duplex loads be safe to use in an 1887 vintage Remington rolling block?
- MikeS
Want to checkout my feedback? It's here:
http://www.castboolits.gunloads.com/...d.php?t=136410
From what I have read and observed, a grain of smokeless (I like 4227) is worth three of black. I never go above 10% of the charge being smokeless, and reduce the amount of black when duplexing. So a 70gr. charge of black becomes a 5gr. 4227 + 55gr. black charge to generate the same performance. This also reduces the need for compression of the black.
I shoot duplex loads in my Argentine roller and '73 trapdoor with no problem, but do not try to get more power than a standard load of black generates.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |