Author Topic: Rechamber a .308 to 7.5 Swiss?? (Read 1565 times)

rbergum95 · « **on:** September 22, 2007, 03:05:57 AM »

i have been thinking about a new project for my next handi. i was thinking of rechambering a .308 winchester barrel to 7.5x55 schmidt rubin. i love this cartridge and for a long time have wanted to build a mannlicher style firearm chambered for it. i was thinking of doing a complete custom bulid on a mauser action but i think i would rather have it on a handi instead. i have looded at the dimensions of both cartridges and it looks doable. anyone have any thoughts on wether or not i should give it a try?

trotterlg · « **Reply #1 on:** September 22, 2007, 04:31:54 AM »

I am thinking a 7.5 Swiss shoots .304 bullets and the .308 shoots .308 bullets. Larry

rbergum95 · « **Reply #2 on:** September 22, 2007, 05:21:20 AM »

i already handload for a k31 with .308 bullets 7.5 swiss is a .308 caliber round.

quickdtoo · « **Reply #3 on:** September 22, 2007, 05:24:54 AM »

It looks like a good rechamber to me, it uses .308" bullets!

Tim

http://ammoguide.com/?catid=6

rbergum95 · « **Reply #4 on:** September 22, 2007, 12:48:59 PM »

well the 7.5 swiss project is going to be a no-go as no one has a reamer available for it. i could have one made but i dont think i want to pay for the tooling to do just one rifle.

quickdtoo · « **Reply #5 on:** September 22, 2007, 01:12:52 PM »

That stinks, I wonder what's up with that? $:-\$

Tim

rbergum95 · « **Reply #6 on:** September 22, 2007, 02:49:14 PM »

wish i knew. every reamer place has them for over 500 calibers except that one. i dont know why. i have had a lot of experience with it and it is one of my favorite calibers of all time. i have used it for hunting and targets and it excells in both categories. only problem is the k31 is definately NOT a hunting gun. the safety is not quick to manipulate in the field and as far as scope mounts go you either have to go with a scout mount (which i have) or spend tons of money on an offset reciever mount. i just think a handi in that caliber would make a great sporting arm.

forestgrump · « **Reply #7 on:** September 22, 2007, 06:41:08 PM »

Ever think of buying a Schmidt Ruben rifle? There a great rifle and their still not too expensive. It's one of my favorites.

quickdtoo · « **Reply #8 on:** September 22, 2007, 07:01:22 PM »

Got one, but it's not handy and it's not a Handi!

Tim

BilAZ · « **Reply #9 on:** September 22, 2007, 07:15:55 PM »

might use a 284 reamer, then a .30 cal throat reamer.... just a thought

Bill

Busta · « **Reply #10 on:** September 23, 2007, 01:41:28 AM »

I am not a rifle reloader, nor pretend to be, but I see one problem with the rechamber. I don't know all the fancy terminology, so I will use my own language. I do read blueprints at work everyday, so this stuck out like a sore thumb to me.

If you look at the outer neck diameter at both the shoulder and the mouth of the case, you will notice that the .308 must use a thicker brass and therefore has a larger diameter than the 7.5x55 S-R. I understand the I.D. of the necks are the same at .308, and the 7.5x55 reamer would clean up the case, shoulder and only about half of the neck. IMO you would be blowing out the neck between the shoulder and the mouth of your cases if this was attempted. The 7.5x55 S-R's neck O.D. is slightly tapered, starting at .334" at the shoulder going down to .330" at the mouth. The .308 Win neck O.D. is .343", .010" to .013" larger than what you want for the 7.5x55 S-R. I understand the S-R case is longer, but IMO not long enough to clean up the difference in neck diameter, or isn't .010" to .013" enough to worry about?

Please straighten me out if I am wrong here. Take another look. Might be why there is no reamers available?

rbergum95 · « **Reply #11 on:** September 23, 2007, 03:29:53 AM »

im not sore on that one. ill let one of the other guys comment on that. but for now at least, its a moot point as there are no reamers available. i will just have to either stick with a standard caliber or figure out another one to rechamber to. biuggets problem is most of the other calibers i want will require a complete rebore as well.

BilAZ · « **Reply #12 on:** September 23, 2007, 05:39:27 PM »

Quote from: rbergum95 on September 23, 2007, 03:29:53 AM

im not sore on that one. ill let one of the other guys comment on that. but for now at least, its a moot point as there are no reamers available. i will just have to either stick with a standard caliber or figure out another one to rechamber to. biuggets problem is most of the other calibers i want will require a complete rebore as well.

don't know if you reload, but a 30x284 has almost the same dimensions as the 7.5 Swiss... same rim as the 308.. reamer rental is $28.. midway has 30x284 Lee pacesetter dies for $27.49.. the ream will clean up the 308 Win hole..
Good Luck!!
Bill

Fred M · « **Reply #13 on:** September 23, 2007, 06:39:22 PM »

Why not simply 30-06, nothing wrong with that caliber. For a custom bore take
a 25-06 and rechamber and rebore for a 30-06 with a fine cut rifled bore.

saltydog · « **Reply #14 on:** September 24, 2007, 02:19:36 AM »

Quote from: Fred M on September 23, 2007, 06:39:22 PM

Why not simply 30-06, nothing wrong with that caliber. For a custom bore take
a 25-06 and rechamber and rebore for a 30-06 with a fine cut rifled bore.

Why not a 243 WIn, 7 mm REM Mag or a 22 Hornet - because he wants a 7.5 Swiss - it is not about the practicality or else we would all own one 22 LR rifle, one centerfire rifle and one shotgun. The 284 reamer to get the 7.5 is about the only way to go on a budget. Remember one of the things that makes that cartridge perform so well is that the K31 rifles are outstanding in quality.

Fred M · « **Reply #15 on:** September 24, 2007, 06:15:46 AM »

For one thing if you want a 7.5 Swiss, a Handi is a poor place to look, unless
you want to spend some real money and start with a 223 bull barrel and
have a reamer made and go to it. In the end what you are getting for $750.00
is a 7.5 Swiss?

The 284 case is a very poor choice for a Handi because of the rebated rim, I
think the ejector or extractor would be riding along the case and scratch it badly. or maby it wont work at all?

If you want more power than a 308 in a Handi a 30-06 is a good place to start.

Talk is cheap but it takes money to buy whiskey.

quickdtoo · « **Reply #16 on:** September 24, 2007, 06:30:18 AM »

The rebated rim works fine on an ejector barrel, dunno about an extractor tho, my 300WSM ejector worked great, never even had any stuck brass using your BB trick, Fred!!

Tim

Casull · « **Reply #17 on:** September 24, 2007, 03:33:51 PM »

Since the two cartridges are almost ballistically identical, I just don't see the point in it.

rbergum95 · « **Reply #18 on:** September 24, 2007, 04:02:36 PM »

the only point i have in wanting one is because i want one. i love the cartridge, i love the gun. if we all need to have a point for wanting something we would have nothing. i could get by for every hunting and shooting need with what i already have, but where would be the fun in that? as it looks now i wont be getting one anyway, i dont want to pay for the tooling to get the reamer. if for some reason a reamer becomes available i will make a run at it.

zasxcd · « **Reply #19 on:** September 27, 2007, 04:39:03 AM »

Many years ago... I wish that I could quote the source, but I can't. Anyway, someone had the same problem - wanted a wildcat chamber cut but couldn't get a reamer cheaply. The article I read showed how to take a bar of tool steel, turn it to the outside dimensions of the chamber that you want, and then mill half of the diameter of the bar off, finally heat-treating the bar. This was supposed to be able to hold up to several chamber jobs before dulling. Do some research (if you want this bad enough) and find someone with a lathe and a mill to help you out.

Ruskin · « **Reply #20 on:** September 27, 2007, 08:21:34 AM »

I understand that reamers can be rented.

quickdtoo · « **Reply #21 on:** September 27, 2007, 09:05:49 AM »

No one has the 7.5x55 available for rent, that's the problem.

Tim

handi243 · « **Reply #22 on:** September 27, 2007, 09:26:28 AM »

Hey Tim were are you at on the stub project from the 300wsm?

quickdtoo · « **Reply #23 on:** September 27, 2007, 09:37:14 AM »

No stub project, the 300WSM barrel, or about 12" of the breech end

went to my gunsmith for him to cut the underlug off and weld to a 6.5mm shilen blank for chambering to 6.5x55, is that what you're referring to?

Tim

handi243 · « **Reply #24 on:** September 27, 2007, 11:19:05 AM »

Yep thats it any news?

quickdtoo · « **Reply #25 on:** September 27, 2007, 11:22:44 AM »

It's a back burner project for Wayne, so it'll get done when he has time, I expect it sometime next year....maybe, if he can work it in between his stock makin!!!

Tim