+1 for 30-40.
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+1 for 30-40.
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I believe the GP was chambered in 12G 2 3/4" (70mm) so in theory anything with an COL of 2.75" should fit!
a 375x444 should check all the boxes.. Ken waters wrote it up in handloader as the "375 express". brass is easy, redding has dies. I have one in a 24" TC contender and its awesome.
Gee if a 577 2 1/2 works why wouldn't a 40-82 basically a 408 2 1/2"
Did the block need any altering?
Last edited by andym79; 03-03-2019 at 08:12 PM.
Well got in on this kinda late but here goes. Way back in '69 I acquired a Martini, originally .303 and sleeved to .22RF by W.W. Greener. Got a 26" .30 cal. tube from Mr. Ackley and chambered it to 30/40AI, then stocked it with crotch cut walnut from Missouri. Wish I knew how to post a pic. Made a custom scope mount over the chamber area. I shoot 180gr Hornady RN pushed by 49gr of H4831, gives me a screaming 2200fps always 3 inside 3/4" at 100yds. One shot one kill. Only thing bugs me is that my son has no interest in handloading, wants to know if he can shoot factory garbage in it. Guess when I'm gone it won't matter much. GW
"If you can walk with crowds and keep your virtue,
Or walk with Kings, nor lose the common touch,
Yours is the earth and everything that's in it,
And, which is more, you'll be a man my son!" R. Kipling
"Brother to a Prince, and fellow to a pauper, if found worthy." Kipling
Boy, I hope after 10 years Wayne wasn't still waiting for more replies before he picked a caliber!!!
Actually it's worse than that - my gunsmith retired, took everything home to make the gun, didn't, and died. I lost it all. Took the money I had saved to pay him and bought the 40 caliber flintlock and now have an Encore barrel in 25 Krag AI. God is good.
Wayne the Shrink
There is no 'right' that requires me to work for you or you to work for me!
If an older iron action, and if a longer case is not going to clear the locking block and eject, consider the 10x25mm Rimmed, which resembles a grown up .297 Morris Tube in .40 cal. With Trail Boss or black powder this is a subsonic, big-bore rook rifle.
With smokeless it aproximates the .38-40 Winchester or .40-50 Sharps, depending upon loading.
The case is simple to make by necking down Starline .44 Russian brass. No trimming or reaming of brass is needed. The case capacity is 4.5 grains of Trail Boss, 16 grains of IMR4227 or 21 grains of FFg Black. Use a Green Mountain 10mm / .38-40 barrel with 1:16" twist.
Accurate cuts the molds in 220-grain, 252-grain or 260-grain.
Attachment 237485Attachment 237486Attachment 237487
John Taylor has the Manson chambering and die reamers I had made, and can use them to do your rifle and loading dies. The long round with 260-grain bullet fits the New Model Ruger Vaquero cylinder and approximates .45 Colt energy with 16 grs. of IMR4227 from a 5-inch barrel.
Attachment 237484
Last edited by Outpost75; 03-06-2019 at 03:43 PM.
The ENEMY is listening.
HE wants to know what YOU know.
Keep it to yourself.
+1 on the .38-55 Winchester ... it's a perfect fit in a large action Martini. Mine is a ton of fun to shoot.
I may have passed my "Best Before" date, but I haven't reached my "Expiry" date!
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 |