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Rechamber a 25 RM to 25-20 SS? (Read 9965 times)

S99VG Oldtimer Offline Posts: 514 Location: CA Joined: Feb 1^st, 2020	Rechamber a 25 RM to 25-20 SS? Apr 4^th, 2021 at 9:52pm	Print Post
	Could you rechamber a 25 Stevens Rim Fire barrel to 25-20 Stevens Single Shot with any degree of success or are there incompatibility issues with bore diameter and twist rate? Thanks much!


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Cbashooter Frequent Elocutionist Offline Posts: 1631 Location: Eastern Wa. Joined: Mar 31^st, 2018	Re: Rechamber a 25 RM to 25-20 SS? Reply #1 - Apr 4^th, 2021 at 9:59pm	Print Post
	John Taylor did a 25 RF 44 to 25-20 Repeater for a member here.it worked very well and shot better tham you'd think.i shot it once at 50 yards and with a 6x scope it was nickel sized groups mostly


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Sure shot Frequent Elocutionist Offline Posts: 1169 Location: East central Iowa Joined: Jun 22^nd, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #2 - Apr 4^th, 2021 at 10:36pm	Print Post
	Typically a 1 in 17 twist and .251 groove. Have you slugged your bore? It might be a little larger. Might work okay with lighter weight bullets and the correct diameter bullet for your bore. You might have an issue with a chambering reamer fitting a smaller bore?


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Cbashooter Frequent Elocutionist Offline Posts: 1631 Location: Eastern Wa. Joined: Mar 31^st, 2018	Re: Rechamber a 25 RM to 25-20 SS? Reply #3 - Apr 4^th, 2021 at 10:39pm	Print Post
	Ya my take in it was it wouldn't work for those reasons.hopefully the owner or John Taylor will chime in.


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S99VG Oldtimer Offline Posts: 514 Location: CA Joined: Feb 1^st, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #4 - Apr 5^th, 2021 at 12:03am	Print Post
	What I have is a 044 1/2 that will be going to CPA soon for some work that came with a 25 rim fire barrel. I will be converting the breech block to centerfire for re-barreling this action to 30-20. I had originally thought about just setting the barrel aside and forgetting about it but the other day I got wondering if it could be salvaged by rechambering to 25-20 SS. I've been down the road of making up 25 RF ammo on this forum and I don't think I want to do that. Of course another option might be to have it bored out to something a bit larger and go from there. At some point I would like to acquire a barrel in 28 30 Stevens, but this is a really light contour barrel and I would prefer something heavier for that.


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Dellet Frequent Elocutionist Offline Posts: 1306 Joined: May 19^th, 2017	Re: Rechamber a 25 RM to 25-20 SS? Reply #5 - Apr 5^th, 2021 at 1:16am	Print Post
	ssdave wrote on Apr 5^th, 2021 at 12:50am: I just went down to the shop and verified something I've believed for a long time. .25 stevens centerfire can be made out of .22 hornet by simply running them into a .25 acp sizing die, necking up, and trimming to length. I used a carbide sizer, ran the case in as far as I could with a shellholder, backed it out, set a nickel on the shellholder, reinserted the case into the die and pushed it in up to the rim. Then, used a rod to tap it out of the die. Chambered perfectly in my .25 stevens RB, but the rim is a bit too thick. I could either turn the rim slightly thinner on the case, or turn the rim recess on the rifle just slightly deeper and then just trim, neck up and use the .22 hornet brass. I then ran it into a 25-20 die to expand the neck from .22 to .25, and then back into the .25 acp sizer to iron it all back out straight at .25 rf dimensions. The neck came out just about perfect diameter. The case is now too long to chamber, but would trim to length. My bore isn't quite good enough to make it worth bothering with, but I know I could make it a shooter out of it if I wished to, by just getting an appropriately sized mold and making the brass. The brass is quite easy to make. A person could also run a .25 hornet reamer into the barrel, but the .251 vs .257 bullet size would make for a lot of neck slop. You might want to check the primer pocket, often swaging down the base can collapse the pocket enough that it will need to be re-formed or cut. If you cut a relief just above the rim before swaging down the base it can help/prevent that. Then on the neck end, the top half of the neck can be very thin and create a donut or almost a shelf. Depending on how you size the neck and seat the bullet, based on diameter, you may need to turn the necks. PPU has worked better than Winchester or Hornady for me. Rim thickness and diameter will need to be changed as well, depending on the chamber. I have 3 25 rf and all three have a 257 bore. For what it’s worth I believe JGS lists a 25-10 or 25 Stevens centerfire. Also a 25 Halsted.


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Sure shot Frequent Elocutionist Offline Posts: 1169 Location: East central Iowa Joined: Jun 22^nd, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #6 - Apr 5^th, 2021 at 8:50am	Print Post
	I have some .25-10 brass that Rocky Mountain Cartridge made for me, works fine in my Stevens 44 1/2 .25 rf with a centerfire breech block. I also have a Stevens 44 that I set the 25 rf barrel back a little, and it is now in .25 acp, fun little shooter.


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S99VG Oldtimer Offline Posts: 514 Location: CA Joined: Feb 1^st, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #7 - Apr 5^th, 2021 at 10:52am	Print Post
	I'm a little confused as these cartridges seem to go by different names. Am I correct in hearing that a 25 rimfire barrel could be rechambered to 25-20 Single Shot?


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Dellet Frequent Elocutionist Offline Posts: 1306 Joined: May 19^th, 2017	Re: Rechamber a 25 RM to 25-20 SS? Reply #8 - Apr 5^th, 2021 at 11:14am	Print Post
	S99VG wrote on Apr 5^th, 2021 at 10:52am: I'm a little confused as these cartridges seem to go by different names. Am I correct in hearing that a 25 rimfire barrel could be rechambered to 25-20 Single Shot? Yes, but you will be extremely limited in bullet choice because of the slow twist rate of the barrel. If it is a .257 bore about 70 grains will be max. If it's a .251 it will be less. Basically a 100 yard plinker. In theory you could chamber it in 25-357 Max. as long as the action could support it, and you might be able to get an 80 grain jacketed to stabilize around 2500 fps. The barrel was designed for a 65 grain bullet about 1200 fps. The twist rate determines the bullet length for the most part, and how much powder you put behind it does not have much effect. Depending on bore size, it takes about 1000 fps of bullet speed to increase the bullet spin rate as much as a 1/12 faster twist.


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Dellet Frequent Elocutionist Offline Posts: 1306 Joined: May 19^th, 2017	Re: Rechamber a 25 RM to 25-20 SS? Reply #9 - Apr 5^th, 2021 at 11:29am	Print Post
	Left to right top row 25 long RF or 25-10, 25-25-86, 25-21-86, 25-20 SS. Bottom row 22 Hornet converted to 25-10 center fire, 204 Ruger to 25-21


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S99VG Oldtimer Offline Posts: 514 Location: CA Joined: Feb 1^st, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #10 - Apr 5^th, 2021 at 11:40am	Print Post
	Dellet wrote on Apr 5^th, 2021 at 11:14am: S99VG wrote on Apr 5^th, 2021 at 10:52am: I'm a little confused as these cartridges seem to go by different names. Am I correct in hearing that a 25 rimfire barrel could be rechambered to 25-20 Single Shot? Yes, but you will be extremely limited in bullet choice because of the slow twist rate of the barrel. If it is a .257 bore about 70 grains will be max. If it's a .251 it will be less. Basically a 100 yard plinker. In theory you could chamber it in 25-357 Max. as long as the action could support it, and you might be able to get an 80 grain jacketed to stabilize around 2500 fps. The barrel was designed for a 65 grain bullet about 1200 fps. The twist rate determines the bullet length for the most part, and how much powder you put behind it does not have much effect. Depending on bore size, it takes about 1000 fps of bullet speed to increase the bullet spin rate as much as a 1/12 faster twist. Thanks, that's exactly what I was looking for. And a 100-yard plinker would be okay. I'm just looking for something to put my barrel back into service. It will be attached to a 044 1/2 so your other suggestion might work well too. Given the rim diameter isn't too large.


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Sure shot Frequent Elocutionist Offline Posts: 1169 Location: East central Iowa Joined: Jun 22^nd, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #11 - Apr 5^th, 2021 at 12:03pm	Print Post
	Sorry to confuse you, the .25-10 cartridge cases that Rocky Mountain Cartridge made for me are the centerfire version of .25 Stevens RF. They work fine in the original chamber of my 44 1/2 .25 RF without modifying, along with a centerfire breech block.


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S99VG Oldtimer Offline Posts: 514 Location: CA Joined: Feb 1^st, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #12 - Apr 5^th, 2021 at 12:41pm	Print Post
	I seem to be getting two interpretations of the 25-10, which is a new one to me. Is it the same thing as the 25 Stevens rimfire or the 25-20 Stevens Single Shot. If not, then what is it and would it work for rechambering my 25 rimfire barrel. Again, I'm just looking for a centerfire cartridge to get the 25 rimfire barrel back into service and I figure most everything would be a compromise to one extent or another. Man, this stuff takes a guy all over the place.


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Dellet Frequent Elocutionist Offline Posts: 1306 Joined: May 19^th, 2017	Re: Rechamber a 25 RM to 25-20 SS? Reply #13 - Apr 5^th, 2021 at 1:00pm	Print Post
	S99VG wrote on Apr 5^th, 2021 at 12:41pm: I seem to be getting two interpretations of the 25-10, which is a new one to me. Is it the same thing as the 25 Stevens rimfire or the 25-20 Stevens Single Shot. If not, then what is it and would it work for rechambering my 25 rimfire barrel. Again, I'm just looking for a centerfire cartridge to get the 25 rimfire barrel back into service and I figure most everything would be a compromise to one extent or another. Man, this stuff takes a guy all over the place. My fault on that maybe. First blackpowder cartridges 25 caliber-10 grains powder-65 grain bullet 25-21-86 25-20-86 25-25-86 All in the photo posted. It was common in the day for a manufacturer to introduce a cartridge, or lay claim to that. So the 25 rimfire, was a Stevens cartridge, their barrel generally labeled 25 Stevens. If Winchester chambered a rifle in that cartridge they would stamp the barrel 25-10. Not wanting to promote Stevens in any way. The 25-10 Center fire is a work around. In my case sizing a 22 Hornet case to fit a 25 Rimfire chamber, Sure Shot bought premade cases. This allows you to convert or replace the breech block to centerfire and no other modifications are needed to shoot. It uses the existing chamber. The 25-20 is further confusing because technically the two cartridges are 25-20 Single Shot and 25-20 Repeater. The original 25-20 SS was too long for the Winchester 92 action to cycle. So they made the case shorter and fatter with the same capacity. That is the surviving cartridge 25-20 WCF (repeater) I have done both conversions. 25 rimfire to center fire or 17 WSM to 25 rimfire. depends on the rifle and how bad I want to shoot it


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S99VG Oldtimer Offline Posts: 514 Location: CA Joined: Feb 1^st, 2020	Re: Rechamber a 25 RM to 25-20 SS? Reply #14 - Apr 5^th, 2021 at 2:13pm	Print Post
	Thanks!


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