40 2-5/8"

Discussions of powders, bullets and loading information.

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50gunner
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40 2-5/8"

Post by 50gunner »

Standard Shiloh chamber, 45 degree, 30 inch, half round 16 twist barrel.

Any secrets on managing fouling, velocity spikes, first shot from a clean cold barrel [without 5/7 degree leade] going into the rest of the group?

Brass, BACO formed from 348 Winchester
Bullet patches up to .400, weighs 396gr with 16 to 1 alloy, base pour, parallel sided, 0.250 meplat.
Goex and Swiss FG
CCI-BR2
Little to no compression with 90 grains, card wad, 0.200 grease cookie, card wad, bullet in case 0.190.

Have had several 12 to 22 fps extreme spreads, then boom, 130 fps spread, even hunting with barrel sights verticals would be a nightmare, not acceptable.

Have also read about what the ODG's did with 330 and 370gr bullets in their 40 caliber Sharps rifles, i like heavy for caliber bullets, the twist is there, so i want to use it, no interest in duplexing any black powder cartridge i shoot, or shooting stubby grease groove bullets, M&M's are for snacking and buttons are for keeping your shirt closed, not shooting at big game animals ; ]

Dont know where to lay my hands on a reamer to cut a leade in the chamber, that may help with the first shot from a clean cold bore issue, but, if fouling cant be managed, and extreme spreads kept in check i'll send her off to return as my 3rd 50 2.5"

Certainly willing to give it another shot if anyone has any tips on managing this problem child.

Thanks,
50gunner
Kirk
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Re: 40 2-5/8"

Post by Kirk »

You should call me...

Kirk
50gunner
Posts: 35
Joined: Tue May 01, 2012 12:49 pm
Location: Oklahoma

Re: 40 2-5/8"

Post by 50gunner »

10-4, will do, Thanks Kirk.
50gunner
Posts: 35
Joined: Tue May 01, 2012 12:49 pm
Location: Oklahoma

Re: 40 2-5/8"

Post by 50gunner »

Alright, Kirk's pointed out the proper brass to order for my chamber, lube and alloy, will give this a try when it all gets here.

Thanks Kirk,
50gunner
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Don McDowell
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Re: 40 2-5/8"

Post by Don McDowell »

Baco''s reformed 45-100 starline brass, Olde Eynsford 1f works great in my Shiloh 40-90 bn.
AKA Donny Ray Rockslinger :?
50gunner
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Joined: Tue May 01, 2012 12:49 pm
Location: Oklahoma

Re: 40 2-5/8"

Post by 50gunner »

Thanks Don, i may get around to trying some OE FG, bought a rifle that came with a case and a half of old Goex FG, need to try to burn it up first.
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Don McDowell
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Re: 40 2-5/8"

Post by Don McDowell »

92 grains is probably where you need to be with that.
The important thing to remember, is after the initial fire form you'll need to add more powder to keep the fowling down and get the accuracy.
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Don McDowell
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Re: 40 2-5/8"

Post by Don McDowell »

The Baco 400360 bullet cast 20-1 and wrapped in sc 55 shoots well in my rifle.
Grease groove their 408396 creedmoor bullet lubed with Bullshop Nasa is a good combo if one is interested in shooting the grooved bullets.
AKA Donny Ray Rockslinger :?
50gunner
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Location: Oklahoma

Re: 40 2-5/8"

Post by 50gunner »

92gr as in a bit more powder to pressure up and burn cleaner than less powder?

Thanks for the grooved bullet info, i have a copy of the 415gr Lyman from a Brooks mold, just had him give it a .396 nose to help with shooting dirty for hunting, it's a great bullet.
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Don McDowell
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Re: 40 2-5/8"

Post by Don McDowell »

More powder to keep the fouling down
Bottlenecks tend to foul pretty heavy if you do t run enough powder
AKA Donny Ray Rockslinger :?
50gunner
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Location: Oklahoma

Re: 40 2-5/8"

Post by 50gunner »

Great, good info, Thanks Don, speaking of bottlenecks, my 44 2-1/4" SBN is the cleanest burning rifle i have, unbelievable.

Only had 33 cases of the brass i've been fooling with left that hasn't been fired, fired up the pot with 40 to 1 alloy, noticed the softer alloy likes a bit more heat, had a great short session, cast 35 bullets, according to the dancing needle on the RCBS 10-10 scale, they all fell within a half to three quarters of a grain, i'll keep the heavies from a casting session and chunk the light ones, didn't loose a single bullet on visual inspection either, have them patched up and ready.

My brass is trimmed 2.615 inch, 0.010 short of chamber length, i'll see how it goes till the new brass gets here.
Michael Johnson

Re: 40 2-5/8"

Post by Michael Johnson »

I have a 40-90BN recently delivered in May with a 1/13 twist barrel. I have been fire forming brass with paper patch 370 grain .402 diameter slugs from Montana Precision swaging. I am using 100 grain loads of Swiss 1fg with a 0.060 veggie wad. Bullets are 0.125 inch into the case.The next step is loading DDbullets. I have a couple of selections from Buffalo Arms that I am casting into 16/1 for Paper patch loading. My brass consists of 200 Starline 45. 2.6 annealed and formed into 40-90BN as well as 100 cases of Rocky Mountain Cartridge lathe turned 40-90-BN cases. The rifle has the MVA XLR soule sight as well as Distant Thunder's canted long range muzzle sight. It also has been drilled and tapped for three scope bases out to 17 inches. I retire in four months and fully intend to wring out this rifle for mid and long range.
50gunner
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Joined: Tue May 01, 2012 12:49 pm
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Re: 40 2-5/8"

Post by 50gunner »

Micheal, dang, what a deal, Thanks for the write up on rifle and components, sounds like a really nice set up, luck smiled on me a little yesterday evening, was going through more stuff i got from Sharpsman Mulhern, found 14 RMC 45 2-7/8" PP cases, ran them full length through the 40 2-5/8" size die, trimmed them to 2.630, they chamber just fine, necks a bit thick, have them loaded with compressed powder and wad only.

I'll fire them at daybreak, maybe they'll take the chamber neck dia and allow a .400" paper patch bullet to be seated by hand, fire forming should also bring the overall length in the 2.625"

I have to ask, what are DD bullets? and also, Congrats! on retirement, things are about to get really busy for you ; ]
Michael Johnson

Re: 40 2-5/8"

Post by Michael Johnson »

DD stands for dual diameter. I am casting the Buffalo Arms JIM403415E bullet for paper patch. Go to their website and check out the diagram for that bullet. The base is a 403 diameter so that when it is patched it will be a good fit in a fired case. The shank of the bullet will still fit in the 400 bore. The diagram of the bullet will explain it better. The goal is to not have to neck size the case at all. It will also fit the standard chamber better than the tapered swaged slugs I am using for fire-forming.
I also have a 45-2.6 LRE so I have no shortage of brass for reforming into 40-90BN.
- Mike
Michael Johnson

Re: 40 2-5/8"

Post by Michael Johnson »

I am guessing your rifle has a 1/16 twist, so I would be looking at the JIM403380E bullet for your application. This would give you good stability all the way to 1000 yards plus. Arnie Seitz (Beltfed) on this website is the bullet designer expert on dual diameter bullets.
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