Jess rebore questions.
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  1. #1
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    Jess rebore questions.

    Thinking about a Jes rebore to his dual 38-55/375 chamber.

    I understand his suggestion is for .376 bullets. Availability seems limited in pre cast. Are gas checks acceptable for dingers? Hunting? I really do NOT want to cast my own. Not interested in upper reaches of velocity, but availability favors gas check.

    What barrel length is best?

    Starline brass, long or short?

    Dies, 38-55 or 375?

    Also, what do I not even know to ask?

    thanks,
    Jack.

    This I-pad knows what I want to say and how to spell better than I do. Sometimes I catch it's mistakes, sometimes I don't.

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    Jes rebores are hybrid rifles at best. Although he does fine work his attempt to make two cartridges in one fail to make a good cartridge of either. It something like making a rifle to shoot 270 Winchester and 280 Remington, both cartridges in the same rifle. If you handload, you can make the Jes shoot very well. He can't make a barrel with even number of grooves, either 3 of 5 grooves?

    I would go with Randy Redmond of Omak Washington or John Taylor or Dan Pederson of Prescott Az.
    ballistics04, edcknives and rclint like this.

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    Sidewinder
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    I just got my JES back and love it. You can use everything from a 376 to about a 379 (worst case you can allways resize down!). i wouldn't run smaller than a .377 cast due to leading. He tests his barrels with a 376 jacketed (which is what he reccomends). Mine is shooting really well with a 377 sns cast both with about 6g of trailboss as well as 24-25g 4198. I'm still doing load development so I haven't settled on a load of two yet. Nor have I tried other bullets. Gas checks are fine (hunting or target) but not needed below like 1500ish fps with a well fitted bullet. I would also consider some of the coated bullets. You can push them harder than a plain hardcast but still tend to be cheaper than a gc - and you don't have to worry if a gc is well seated.

    bullets that will work (some of these are the same bullet from different companies) :
    moyers cast - 265 gr .377
    kings shooters 245g .377
    montana bullet works -300gr GC .375, .376, .377
    -265gr gc .375, .376
    -264g gc .375, .376, .377, .378
    -250g gc .375, .376
    badmans bullets 230g .379 - comes coated as well
    cheycast 245g .378 - also comes coated
    Meister bullets 245g .377
    missouri bullet company 245g .379 - also comes coated
    grizzly cartridge 260g .378
    northern plains gun works - 275g gc .375, .377
    oregon trail laser cast - 240g .377 .379
    bear creek - 255g .379 moly coated only
    sns casting 255g .377 - also available coated

    Everyone I've talked to who has actually used one of his rifles love them and say they shoot amazing.

    I went with the three grove on mine. However he can do 3,4,5,or 6 grove if you prefer. I did mine on a ts with a 18" barrel.

    As stated above it's not a "true" 38-55 and that upsets some purists, but for me a couple of thou of grove diameter doesn't matter if the work is done well, and he does great work and turns out accurate barrels. I strongly disagree that he doesn't make a good cartridge of either.

    You can use commonly available bullet sizes instead of looking for the few companies that turn out .380+ bullets. Almost all of them make a .376-.378 bullet so it's easy to get you or hands in them. I think unless your a purist as above or you cast it's the smarter way to go. You also have a decent selection of jacketed bullets if you want to go that route. I'm using it primarily for boar and bear so a big 255 at 13-1500 at the target (figure about 15-16 at the muzzle - a little lower than I previously stated because I realize it's going to maintain its velocity a bit better than I originally thought, and i don't want to risk loosing too much penetration)

    As far as brass - Winchester brass is what JES recommends, however I'm using short starline and it's working well

    The smaller grove diameter also allows more selection of dies. Any 38-55 dies will work, unlike with the larger diameters which require the rcbs cowboy dies. Im using lee 38-55 dies, and my bullet seating did is actually stamped 375...but it has been working great so far.

    Incidentally my gun has also shot ALL the commercially available 38-55 ammo spectacularly well. Most if not all the commercial ammo is loaded with a .377 bullet. Which makes it worthless in a "true" 38-55 with a .380 grove. But in the .376 jes it shoots great. Below is a 3 shot group and a 2 shot group I shot with my rifle using Jamison 38-55 (255g at 1450 per the specs, prob a bit slower due to my short barrel) it was a cold clean barrel while sighting in (hence the two groupss) - rest was my hand on top of my rifle case so not very secure but still pretty pleased for factory loads out of the rebore.

    last comment. The difference between his 38-55 and 38-55/375 chamber is the chamber diameter is slightly larger on the combo chamber. Since true 375 pressures are higher than I was willing to go, and I wasn't planning on hotrodding I decided on the slightly tighter 38-55 chamber and call it a day. If you haven't already I would call Jesse. He is really easy to talk to and will answer all your questions and help guide you. He prob won't pick up but leave a message and he usually calls back within and hour or two
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    Last edited by lukianoj; 04-21-2017 at 08:47 AM.
    Jeremy - .375 club member 111
    marlin 336ts (1984) - 38-55 rebore by JES
    Winchester 1894 (1904) 38-55
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    Tinhorn
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    I have had really good luck with Hunters Supply bullets, although I mostly add a gas check and run them through a .377 sizer die to seat them. They seem to group better with a gas check and can certainly be run faster with them. Both of the Marlins Jesse has rebored for me have been top notch!

    Hunters Supply Hard Cast Bullets 375 H&H Mag (376 Diameter) 260 Grain
    Last edited by Hook; 04-21-2017 at 07:53 PM.
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    I got the standard 375 chamber, 3 groove, from JES. I use Lee 38-55 dies to load Starline short brass with Sierra jacketed 200gr FN. I also use Lee 375 Win dies to load JBA 375 brass with the same Sierra bullets. I use H4198 for my 375 loads, and I'll try some Trail Boss this summer in my 38-55 loads.

    I don't shoot cast bullets in any of my guns, and I have no plans to shoot cast, so my JES re-bored Glenfield meets all of my needs and then some. It has become my favorite rifle for hunting. The 20" barrel makes it a great woods gun.
    Todd

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    Jes rebores with .376 groove will shoot .375 dia bullets meant for the .375 Win

    His rebores have a slower twist like the 38-55 making it possible to exceed .375 in performance load for load
    Do some reading in our reference library.

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    Quote Originally Posted by papabear View Post
    Thinking about a Jes rebore to his dual 38-55/375 chamber.

    I understand his suggestion is for .376 bullets. Availability seems limited in pre cast. Are gas checks acceptable for dingers? Hunting? I really do NOT want to cast my own. Not interested in upper reaches of velocity, but availability favors gas check.

    What barrel length is best?

    Starline brass, long or short?

    Dies, 38-55 or 375?

    Also, what do I not even know to ask?

    thanks,
    Jessie has done two in 356 winchester and one in 38-55. All fabulous shooters. I left the 336 octagon at 22 inches and will,be dialing it in soon. The other I cut to 19" and it was an extremely accurate rifle for me using my handloads. For my 38-55 the barrel is 16.25. I am in Arkansas so the bullets are not accessible but I bought gas checked cast bullets from Moyers Bullets. No wait and EXCELLENT customer service. All my JES conversions are 5 groove rifling. I bought all the 38-55 brass I will need the rest of my life from Starline. It is excellent as well.

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    Thanks folks. The twist is one of those questions that I forgot to ask. I am reluctant to visit with Jes. No slam on him or his work, but in my experience, craftsmen usually try to sell you that their product is the way to go. That may or may not be the best way. We already have a no vote and swany has reservations about the twist. Got to think on this.

    thanks,
    Jack.

    This I-pad knows what I want to say and how to spell better than I do. Sometimes I catch it's mistakes, sometimes I don't.

  10. #9
    Sidewinder
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    I think swany was saying the twist is better but I may be miss-reading him...
    Jeremy - .375 club member 111
    marlin 336ts (1984) - 38-55 rebore by JES
    Winchester 1894 (1904) 38-55
    Winchester 53 25-20 takedown

  11. #10
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    I also have a Marlin 30 AS rebored to 356W and shortened to 16.5" by JES. Papabear call and talk to him. He is not a high pressure salesman and will not try to sell you anything. He told me that the extra $25 for 5 groove was unnecessary, but said it's up to me what I want. He also is very fast on turn around time, especially considering how busy he is. I highly recommend him.
    Last edited by shawlerbrook; 04-21-2017 at 03:24 PM.
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