Hey Guys,

30-40 Krag necked up to 416 cal, COL to function through a 336????? Seems like it could be done (should have been done) ..... any info......... insights?

Lobo in West Virginia

Nearest I could come to it was the .40-.348 Ack Imp.

The .348 case is a lot larger than the 30-40, and it functions fine in the Win Mod 71. Just what would happen to a modified Marlin Mod 336 chambering this is a good question.

If i was building a .416 to function through a Model 336 Marlin ,Iwould use .303 British brass.

1. .303 Br. is cheaper than .30-40 Krag brass.

2. The rim on the.303 will fit through the ejection port on a Model 336 in 30-30 caliber,the 30-40 Krag will not.

3. There would be less trimming on the .303.

4. The future supply of .303 cases is more assured than the 30-40 as there are more manufacturers of the .303.

Unless you were planning to use cast bullets,finding bullets of the proper construction might be a problem.

I started work on a similiar project several years ago,Igot sidetracted and never finnished it though.

I have an old SMLE action that I was going to build it on for testing and evaluation..

I machined a chamber insert for a 12 ga. singleshot shotgun to fire form .303 British to a straight case.I then trimmed the cases to 2.1 if I remember correctly.The cases are still around somewhere though I haven't the foggiest idea where.

Probably the 16 inch twist that is used on the .416 JDJ would be about right.

The case would be very similiar to the .40/60 Maynard 1882.

WC

Hey Guys,

I've got a 336 chambered for the .35 Rem. Periodically, I play around with the idea of reboring to .375 or .416 on a case that would give similar balistics, just a bigger hole on impact. Paco Kelly did a 400/30-30 that's interesting, but the 30-30 case is just too small. I'd love to try the 416 Beartooth, but the bolt in the 336 is smaller than the rim on the parent case.

The .35 Rem case is already larger in diameter than the 303 Brit, while the 30-40 Krag case has the same body diameter as the Rem.

According to my reference, the Krag rim is .545" while the 303 is .540" a difference of five thousandths of an inch. I wouldn't have believed that would cause failure to eject. I guess it's back to the drawing board.

Lobo in West Virginia

Wouldn't think .005" would make that big a difference, especially since it's on the smaller side. Maybe a new extractor with a slightly longer hook would be the answer.

I like your concept of the .303 Brit necked up to .411, tho. That's a pretty strong case and should hold up. The recommended chamber pressures are very similar for the .303 and the Marlin 336 action. This almost sounds like a rimmed version of Alyeska's .4ll Hawk he has chambered in the Win '05 action.

COTW lists both the .303 BR.and the .35 REM. as measuring .458 at the base,while the 30/40 Krag measures .457.

I measured several samples of .35 Rem.(average .4538) and
both S&B and Winchester .303 BR.(average .4536) and 30/40 Krag (Frankfort Arsenal)(.4583}.

Average rim dia. .303 BR.-.5292,30/40 Krag-.5395.

Clymer Reamers prints list base diameters .303 Br.-.460,.35 REM.-.4589,and .30/40 Krag-.462.

WC

EL ! What you have invented is called a 40/60 or 40/70 Maynard which came out sometime around the civil war or there after ! Latter used in the 1895 win. by another name in Black Powder, and then turned into the 405 winchester round same rifle ! JAGG

Jagg,

I'd just as soon use an existing cartridge, given equal quality in the brass. I wonder if Starline makes brass??? Hmmm I wonder if the cartridge is equal or larger than the .35 Rem??

A few months ago, Ross Seyfried did an article about the .400 Frasier, chambered in a Frasier single shot rifle. It's about an 1885 vintage rifle and blackpowder cartridge. Ross did a little load development, and after finding a reasonable load, took the rifle out after elk. He took out both shoulders on a cow with a cast bullet. Nothing wrong with black...... :p

Lobo in West Virginia

EL ! The round is bigger then the 35rem and more power also ! You are with smokeless in the 405 win. class ! Can you kill an elk ? Yes with black or smokeless loads ! You can also use a SMLE 303 british action to make this rifle up ! JAGG

Jagg,

Do you know where I can get info on these cartridges??? Demensions? Loading data............ no I haven't looked yet.

Lobo in West Virginia

Lobo,
There's quite a few cartridges listed on Steve Ricardelli's site
http://stevespages.com/page8d.htm