Be Sure to visit the store to see whats new

Author Topic: .270/6.8 mold  (Read 32018 times)

dh2

  • Jr. Member
  • **
  • Posts: 54
  • Noe Guest
    • View Profile
.270/6.8 mold
« on: June 15, 2014, 07:24:48 AM »
I would like to get a mold for .270Win and or 6.8 SPC  I am thinking about 130Gr. with a point  and gas check , I don't see much out there in factory molds that would fit this bill for both rifles.
I like the lyman 280473 mold but it does not look to be available any more.
or is there some thing out there I have not looked at?
 
« Last Edit: June 15, 2014, 07:38:39 AM by dh2 »

Beagle333

  • 1000 Dollar Club
  • Sr. Member
  • *
  • Posts: 259
  • HP mold aficionado
    • View Profile
Re: .270/6.8 mold
« Reply #1 on: June 15, 2014, 12:43:17 PM »
There aren't very many out there. I'd love to see a Loverin style in something like the 130gr you mentioned.  8)

DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #2 on: June 16, 2014, 06:45:29 PM »
There isn't much available out there for 270s. What is available is designed for the 270 Winchester with its long case neck (case neck length .384"). Cartridges with short case necks like the 6.8 SPC (case neck length .272") and the 270 WSM (case neck length .277") usually won't work well with those type designs without having the bullet seated very deep in the case, with the gas check well below the bottom of the case neck, which is something I don't want to do. I have a Browning A-Bolt in 270 WSM. This is why I haven't really thought too much about using cast lead bullets in it so far.

The two mould designs I know of are the RCBS 270-150-SP which is spec'd at .278" using Linotype alloy (84/12/4). See: https://shop.rcbs.com/WebConnect/MainServlet?storeId=webconnect&catalogId=webconnect&langId=en_US&action=ProductDisplay&screenlabel=index&productId=3314 . The other mould I know of is the Redding-SAECO #270 140gr TCGC, which is spec'd using Taracorp's Lawrence Magnum bullet alloy (91.75/6/2/0.25). See: http://www.redding-reloading.com/online-catalog/88-bullet-moulds-charts . Sorry I couldn't come up with a better image of this one.

I haven't done a chamber cast of my rifle yet, so I don't know the specifics about it. From loading a lot of different jacketed loads, however, I know it has a fairly tight chamber and throat. From looking at the Lyman Cast Bullet Handbook, it appears that the RCBS 150 gr SP bullet would have to be seated very deep, with the gas check well below the case neck in my rifle. This, along with the fact the bullet is spec'd at .278" with Linotype alloy makes me think this design would not work for me.

The SAECO #270 140gr TCGC, on the other hand looks like it could work. From the Lyman Cast Bullet Handbook's OALs, it appears that this design might even be able to be seated with the gas check mostly within the case neck on my rifle. What I'm not sure of is the size these bullets would drop from the mould with my alloys. Because of this uncertainty, and the cost of the SAECO moulds, I haven't really thought much more about casting for this rifle.

If we could come up with a design in the 130 to 140 gr weight range with a profile like the SAECO and had the spacing of the grease groove and driving bands like that, and that would also drop bullets around .280" with WW alloy, I would be interested. That type design would also work well in the 270 Winchester and 6.8 SPC rifles. IMO.

If we could get some of the AR guys, like on the 6.8forums interested in something like this, I think we might generate a lot of interest.

Your thoughts?

Dave

Sorry. My link to SAECO doesn't go to the charts showing the moulds. You'll have to click on the image of Chart No. 2 to see a small image of the designs.
« Last Edit: June 17, 2014, 04:12:00 PM by DR Owl Creek »

SwedeNelson

  • Administrator
  • Hero Member
  • *****
  • Posts: 1768
  • Bullet maker, maker
    • View Profile
Re: .270/6.8 mold
« Reply #3 on: June 16, 2014, 09:57:24 PM »
Something to look at.
Can change as required - just something to start with!





Bullet maker, maker
Al Nelson

DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #4 on: June 17, 2014, 04:15:26 PM »
Something to look at.
Can change as required - just something to start with!





Bullet maker, maker
Al Nelson


Al,

Thanks for doing the drawing. I really like it! I think that would work in my rifle. I would buy one just to try it.

Dave


DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #5 on: June 19, 2014, 06:49:57 PM »
I was trying to find some info on some of the Lyman 270 moulds that used to be made years ago. I didn't come up with much that helps to show what was available and how they were designed. The old Lyman #45 manual from the 1970's shows only the #280473 (128 gr GC) and the #280412 (139 gr GC). By around 2000, both of those were gone, and the only mould still shown then was #280642 (150 gr GC).

The Lyman #280642 looked like it wouldn't work in short-necked, one-caliber length case necks because of the spacing of the driving bands and grease groove from the base of the gas check. In addition, the front driving band extended well out toward the front of the bullet, which would require the bullet to be seated very deep in most short-necked cases.

I also found some references to a Lyman #280468 GC which may have been about 110 gr, and a RCBS #27-130-FN GC which I assume would be about 130 gr. I can't find any other description or info about any of these designs that were once made.

Does anyone have any info on these (pictures, drawings, prints, etc)?

I thought it might help to see the types of moulds used in the past to try to come up with a new mould design for today.

Thanks,

Dave

Beagle333

  • 1000 Dollar Club
  • Sr. Member
  • *
  • Posts: 259
  • HP mold aficionado
    • View Profile
Re: .270/6.8 mold
« Reply #6 on: June 21, 2014, 01:56:47 AM »
What about this one, stretched out to 130gr? It's a nice boolit and would be a much better one (imho) if it were a little heavier.


dh2

  • Jr. Member
  • **
  • Posts: 54
  • Noe Guest
    • View Profile
Re: .270/6.8 mold
« Reply #7 on: June 21, 2014, 06:59:06 AM »
I am coming out with some of the luck I was looking for !!!
1. I think it would need a good point on it like the pic from SwedeNelson to cycle in the AR-15 (I hope that one takes off in to            production.)
2. I have tried 110 Gr SP jacketed bullets in my 98 Mauser in .270 Win. they are all over the target.
    And the 6.8 SPC 130 gr is about as heavy as it can go I am thinking going heavier would make it a 6.8 SPC Blackout I don't see the   twist  rate being able to support it.
3. Another shot of good luck I came across a Lyman #280473 (128 gr GC) the thing I hate the most about it is that it is a single cavity mold , it could take some time feeding an AR-15 casting one bullet at a time (4 Cavity would be more like it.)but it will give me an idea how this idea is going,

timbuck

  • 1000 Dollar Club
  • New Member
  • *
  • Posts: 20
  • Noe Guest
    • View Profile
Re: .270/6.8 mold
« Reply #8 on: June 21, 2014, 02:18:13 PM »
I get 2.356 oal for this bullet. 
Spec. is 2.260 oal.  For a 6.8 SPC.
Won't fit in the magazine for a semi auto.
« Last Edit: June 21, 2014, 03:16:48 PM by timbuck »

DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #9 on: June 21, 2014, 04:58:54 PM »
... And the 6.8 SPC 130 gr is about as heavy as it can go I am thinking going heavier would make it a 6.8 SPC Blackout I don't see the twist  rate being able to support it. ...


dh2,

Keep in mind that the twist rate needed is determined by the bullet length, and not the bullet weight. In my 270 WSM (1:10 twist), I have worked up good hunting loads using bullets as light as the Banrnes 110 gr TTSX-BT, on up to the Hornady 150 gr SP. Both of these will shoot under MOA. My "practice" load is with the Sierra 135 gr HPBT MatchKing, which will shoot closer to .5 MOA.

The Barnes 110 gr TTSX is 1.168" long. The Sierra 135 gr MatchKing is 1.281" long. The Hornady 150 gr SP is 1.248" long. Some other bullets in that weight range available are the Nosler 130 gr Partition Spitzer which is 1.135" long, the Berger 130 gr VLD which is 1.181" long, and the Berger 140 gr VLD which is 1.245" long.

The Berger VLDs have long boattails and long secant ogive noses. Berger recommends a twist rate of 1:11" or faster for both of the above listed VLDs. The proposed NOE 130 gr cast bullet shown above has a total length of .950". The usual 1:11" or 1:12" twist of most 6.8 SPC rifles should easily stabilize a bullet of the length. I haven't run the numbers yet, but I believe the Greenhill Formula would show that even a slower twist rate would work well for those too.

As far as velocity, the Hornady 9th Edition loading manual shows load data for the 6.8 SPC with bullets as heavy as 130 gr (with GMX, SST, InterBond, and InterLock SP bullets) with 7 different powders, and Maximum loads between 2200 fps to 2300 fps. The Speer Reloading Manual #14 shows load data with bullets as heavy as 130 gr (Spitzer BTSP and Spitzer SP bullets) with 12 different powders, and Maximum loads between 2262 fps to 2547 fps. The Western Powders Data guide 5.0 (for Accurate and RamShot powders) has data for bullets as heavy as 140 gr (Nosler 140 gr Ballistic Tips and Sierra 140 gr HPBT GameKing bullets) with 6 different powders, and Maximum loads running between 2016 fps to 2342 fps. The 6.8 SPC catridge should have enough case capacity to easily push a 130 gr cast lead bullet well up there too.

Dave   
« Last Edit: June 21, 2014, 05:10:48 PM by DR Owl Creek »

DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #10 on: June 21, 2014, 05:06:39 PM »
What about this one, stretched out to 130gr? It's a nice boolit and would be a much better one (imho) if it were a little heavier.



Beagle,

I think a Loverin style bullet in the 130 gr weight range would be an excellent choice for all of cartridges like the 6.8 SPC, 270 Winchester, 270 WSM, and the 270 Weatherby Magnums. The Loverin design with its long bearing surface has a great reputation for accuracy, particularly at higher velocities. With its nose profile, it should also feed reliably in any type rifle, including ARs.

Something else that hit me was that the Loverin design would work great for someone who wanted to paper patch it, and try for accuracy a very high velocities.

I would certainly buy one of those to try if it was available.

Dave

dromia

  • Administrator
  • Hero Member
  • *****
  • Posts: 3331
  • Sans Peur
    • View Profile
Re: .270/6.8 mold
« Reply #11 on: June 21, 2014, 05:10:08 PM »
I like the look of the Loverin and would be tempted by one of them, you've got to love a Loverin.

DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #12 on: June 21, 2014, 05:12:44 PM »
I like the look of the Loverin and would be tempted by one of them, you've got to love a Loverin.

Dromia,

You are right again, Sir!

Dave

dromia

  • Administrator
  • Hero Member
  • *****
  • Posts: 3331
  • Sans Peur
    • View Profile
Re: .270/6.8 mold
« Reply #13 on: June 21, 2014, 05:24:51 PM »
I've got a BSA CF2 Stutzen in 270 that deserves that bullet.

DR Owl Creek

  • 1000 Dollar Club
  • Full Member
  • *
  • Posts: 205
    • View Profile
Re: .270/6.8 mold
« Reply #14 on: June 21, 2014, 05:25:53 PM »
I get 2.356 oal for this bullet. 
Spec. is 2.260 oal.  For a 6.8 SPC.
Won't fit in the magazine for a semi auto.

Timbuck,

Thank you. You raised a point I had not thought of. That design would be .125" too long to fit in an AR magazine. The nose would have to be shortened accordingly to make it work.

Dave 

 



Castpics and Reloader's Reference