TK going to JES
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  1. #1
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    TK going to JES

    Just digested some of the posts on converting Texans and TK's - thanks guys, for doing it "your way"...I started to hijack gunsrewguy's thread and figured I'd better start a new one...

    My TK just came off the rack! Thanks for the encouragement to "have at it"! I'm thinking a 400 Winchester, but haven't decided on which brass to use. The original drawings (also called 408 Winchester) show brass similar to 303 Savage, which I have on hand, however it was never put into production and the 307 and 356 that were put into production used that same brass in original notes, but opted for 444 type brass with a 30-30 type rim. So, I am vacillating between the 307 brass, that I also have, and the 303 Brass. Either way, it would be a 40 caliber wildcat. I toyed with using 30-30 brass, but it is marginal for .400 bullets and too small for .410 bullets. I could do the 405 Jess and keep the 30-30 bolt unaltered and use the 307 brass. It would be a cast bullet shooter so no lack of bullet availability. Ballistics of a "modern" 40-82 Winchester Express round - 260gr @ 1800fps or a touch more. Staying just short of the "ouch" limits...LOL


    Any thoughts? Comments?
    Sweetwater
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    Deadeye
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    I like the idea of a good 40 cal round moving a 250 - 290 grain round at 1800 fps, should be able to hunt anything in the CONUS with confidence.
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    I may have a dummy round that I made a few years back, on a 30-30 case, a .400 bullet..the cartridge on the right. Looks almost wasp-waisted, but hasn't been fire-formed. Left is a 32Spl, middle is my 35-30 with a 290gr cast bullet dummy loaded.
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    Wrangler
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    If you dig around on the 336 forums I had a thread a year or two ago about a 40 in the 336 action. One of the other members had already been down this road and gave a lot of very useful information. Do a search and take a look. I was going to do something like a .40-70 Maynard style round, probably based on the Krag, IIRC. Things have sidetracked me from, mostly single shots, '86's, and revolvers, but it's still a great idea. A wide nosed cast slug of .40 caliber, of medium weight, say 275 to 300 gr. at anything over 1600 fps should do for anything in the lower 48. The only reason for more speed would be flatter trajectory, and the forty should have superior BC at 300 gr. weight to a 45 cal. 350 gr. and the SD will be much better for penetration.
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    Unless you have two or three hundred pieces of new brass on hand, I'd go with something based on brass in current production, like the 405 Jess.
    ..
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    Gun Wizard
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    Would go the 307 route, no need to change the bolt face, 307 and 356 brass is around as we know. Saw where a fellow worked up 308MX brass to function in a 307, believe the neck ended up a bit shorter.
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    Quote Originally Posted by twodot View Post
    Unless you have two or three hundred pieces of new brass on hand, I'd go with something based on brass in current production, like the 405 Jess.
    ..
    the 405 Jes is a shortened 444 case. I sold my 444 and all its components, so no brass. The 307 (I have 150 pieces) is the same case with a different rim and when blown out is 1.96" long so no trimming there and no bolt face alterations. The 303 Savage (I have 300 pieces) would have the same length as the 307 as just a tad less taper. Think "improved" LOL.

    307 on the left 303 on the right, cast 270gr from CitySlicker
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    Sweetwater
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    Esteemed Sharpshooter
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    I have done both the 307 and 356. Love them both and really couldn’t choose between them. I like the 307 for longer range and my 356 shorty for still hunting, stalking and brushy areas. As far as brass goes 307 is much easier to find and with the Marlin you can use 308 brass. It sounds like you were leaning toward a 40 cal and the 405 JES sounds really cool.
    pacificpt likes this.
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    Gunfighter
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    Good evening
    We have a 405JES and it will do all what the 444 can. Those short Hornady brass no one wants make real good 405 JES brass. Plus Starline makes 444 Marlin brass so it is real easy to get.
    We shoot ours with 265 cast up to 340 grain cast. Lighter bullets you might as well just use a 44 Mag.
    Mike in Peru God Bless you.

  11. #10
    Gun Wizard
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    The 30-40 Krag and the 303 Brit have been made into black powder 40-60 single shot rifles. Basically the very powerful 405 Winchester was a lengthened 30-40 case and plinker loads for one have been made from these cases for the 405. While I think you might need bolt face alterations for a Marlin the cartridges themselves loaded with smokeless at smokeless pressures would have a certain appeal. I have always felt the 444 was a joke and never bought one as it cannot do what a handloaded 45-70 can manage. About the heaviest bullet they used in it was 300 grains and some down to 265. (I have heard that they have now made some I a 1-22" twist instead of the old 1-38" which is a big improvement). However, if one necked it down to a 40 you would have the equivalent of a 405 Winchester which would give a bit more range and was a proven big game rifle.

    I have a 38-55 Marlin Cowboy and with handloads I can get performance beyond what is needed for hunting deer and as none of these pumpkin slingers are particularly longer range. Jes can re-barrel to the 35-30 which many find rewarding as they feel that it can handle the heavier cast bullets at 250 grain better than the 35 Remington. They do have a little better down range velocity retention than a 38 cal. Mostly what one does is based on what the bolt face permits.

    DEP
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