Post by: yorketransport on January 26, 2019, 09:14:13 PM
Today I got an even better idea! Now I think I'm going to push a 27 Nosler reamer in .167" deep and use a 338 RUM headspace gauge. This would give a full 10gr case capacity increase over the 27/28 Nosler and a nearly 17gr increase over a factory 27 Nosler. The only change is that I would use 338 RUM brass instead of Nosler brass. That opens the door for a couple other brass options since I can form 338 RUM brass from any of the RUM cases and I happen to have almost 200 pieces of 7mm RUM brass sitting around.
This is a 27/338 RUM case loaded with a 168gr Hammer Hunter at 3.680" next to a 27/28 Nosler case (formed from a 7mm RUM case). The shoulders are a little "soft" because of the case forming.
(https://i.imgur.com/aF44KRD.jpg?2)
Post by: NWShooter on January 26, 2019, 09:41:41 PM
Post by: BULLBLASTER on January 26, 2019, 09:45:52 PM
Post by: NWShooter on January 26, 2019, 10:00:12 PM
Post by: yorketransport on January 26, 2019, 10:03:48 PM
Why not a 270-7mm rum?
Because I already had one. :chuckle:
Post by: Jolten on January 26, 2019, 10:11:24 PM
Post by: NWShooter on January 26, 2019, 10:16:58 PM
Badger 2.0???
Possibly...... Bunch of sicko's😷 But then again a guy only needs a .270 Win or a 06. Uuuuuuh OK. :chuckle: :chuckle: :chuckle:
:chuckle:
Post by: Reidus on January 27, 2019, 12:54:52 AM
Post by: Dan-o on January 27, 2019, 01:25:09 AM
I'm almost surprised you're not building it in a revolver.
Expected velocity with that Hammerhunter?
Post by: bearpaw on January 27, 2019, 06:27:42 AM
Good grief man......
I'm almost surprised you're not building it in a revolver.
:yeah: looks pretty interesting though
Post by: BULLBLASTER on January 27, 2019, 06:37:41 AM
Makes perfect sense.Why not a 270-7mm rum?
Because I already had one. :chuckle:
I can also see the mag box reasoning
Post by: jasnt on January 27, 2019, 08:07:12 AM
Post by: yorketransport on January 27, 2019, 09:09:34 AM
How does that affect the base diameter in the chamber when you run it in 0.167" deeper? Couple thou bigger at the base?
Yes, the chamber ends up slightly "fat" at the base. It's not an issue and can actually help prevent the "click" at the top of the stroke when opening the bolt. I use 404 Jeffery brass in my RUM based 375 BME and 8x68s brass in the 338/375 Ruger and essentially end up with the same condition only I'm using slightly undersized brass instead of a slightly over sized chamber.
Badger 2.0???
I thought about just using a 6.5 Badger reamer with a 270 pilot bushing and then cutting the neck/throat with a 270 reamer. After playing with the Badger a bit, Biggerhammer (LLBH :salute:) and I both think that making the shoulder angle a bit shallower would help allow more powder options. The sharp shoulder and small bore diameter on the Badger makes US869 the most usable powder to prevent powder bridging, the problem is that US869 has pretty dramatic temp swings.
Good grief man......
I'm almost surprised you're not building it in a revolver.
Expected velocity with that Hammerhunter?
I have 2 barrels getting chambered, a 25" and a 28". The goal is to hit 3300 fps with the 168gr Hammer Hunter from the 25" barrel and get closer to 3400 fps in the 28" barrel.
If it all works out this would be a pretty neat "entry level" high performance wildcat for guys who don't want to do a lot of fireforming or buy custom dies. Cases can be formed by necking down 338 RUM brass in either a 300 SAUM or 30 Nosler die, then running them into a 27 Nosler die held off the shell holder enough to just bump the shoulder on the case. The shoulder angle and diameter will change slightly after the first firing so they match the Nosler case but not enough to make a significant difference in case capacity. ADG makes 338 RUM brass or its very easy to form 338 RUM brass by running any of the other RUM cases into a 338 RUM full length sizing die with the decapping assembly removed. If you do that you just have to trim the cases back a little bit more.
Now I just need to convince the smith doing the work that this is a good idea. I've encountered a lot of folks who don't like my approach of mixing different reamers and headspace gauges. What's the worst that could happen when you intentionally cut a chamber with .167" excessive headspace? :chuckle:
Post by: NWShooter on January 27, 2019, 09:32:20 AM
Post by: Jolten on January 27, 2019, 10:26:43 AM
Post by: Jolten on January 27, 2019, 10:31:59 AM
Post by: b23 on January 27, 2019, 11:59:29 AM
Would retumbo work in the badger 1.0?
You can make about any powder "work" it just may not work well and won't give you the velocity something like this is capable of. The more overbore something is, the slower the powder needs to be. US869 not only burns like wet coal, but it's a ball powder so there is generally no issue with getting enough of it in the case like there is with stick powders. RL33 is fairly slow and could maybe be a suitable choice, but I'd bet US869 will out do it with regard to velocity, and lets face it, that's the whole reason we build these fire breathing dragons, so we can push bullets faster or push a heavier bullet as fast or faster than a lighter one.
Post by: yorketransport on January 27, 2019, 01:15:28 PM
#LLBH!! Btw I'm still waiting for you to redo that HPBT gameking bullet trap that you blew up :tung:
Would retumbo work in the badger 1.0?
I will, I just need to build a 30 caliber to shoot it out of! I seem to have sold all of my 30's so I'm working on one now, just need to get my action back so I can send it off again. :chuckle:
Retumbo would work with the lighter bullets in the Badger but it's too fast to work well with the 160s that I shoot in there. I'm tempted to try out Ramshot's LRT powder but I still have half a keg of US869 that I really need to use up.
Post by: NWShooter on January 27, 2019, 02:30:12 PM
Post by: yorketransport on January 27, 2019, 02:54:15 PM
30 Nosler? :chuckle:?
Pretty much, it's a 300 PRC Sherman Improved. It's like a 30 Nosler/300 PRC but with more expensive dies. :chuckle:
Post by: Jolten on January 27, 2019, 05:33:39 PM
#LLBH!! Btw I'm still waiting for you to redo that HPBT gameking bullet trap that you blew up :tung:
Would retumbo work in the badger 1.0?
I will, I just need to build a 30 caliber to shoot it out of! I seem to have sold all of my 30's so I'm working on one now, just need to get my action back so I can send it off again. :chuckle:
Retumbo would work with the lighter bullets in the Badger but it's too fast to work well with the 160s that I shoot in there. I'm tempted to try out Ramshot's LRT powder but I still have half a keg of US869 that I really need to use up.
Hmm well might I suggest building a fancy .308 win? ;)