.270 Winchester & cast bullet loads.

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  • Last Post 31 March 2019
Pigslayer posted this 29 March 2019

Has anyone cast for the .270 Winchester? If so . . . what bullet?

If someone else had of done to me what I did to myself . . . I'd have killed him. Humility is an asset. Heh - heh.

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frnkeore posted this 29 March 2019

At the request of people on the NOE forum, I design this Loverin style bullet for NOE and it's in stock, in both PB & GC:

http://noebulletmolds.com/NV/index.php?cPath=28_188&osCsid=noaa5f03dabf870fug880mpur6

I'm not a bolt action guy so, I only shot it once, when it first arrived. My data won't be of value, because I shot it from a machined case, with a bore size hole back to the primer.

Lyman has data and there should be people here that can help.

Frank

 

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M3 Mitch posted this 29 March 2019

I don't shoot any .270s, but, as a first guess, it looks a lot like a 30/06, so a relatively heavy bullet say 150 grains, would probably shoot best.  Lighter bullets should be OK for plinking.  At least this is my experience with the '06.

I have always been a bit reluctant to add a .270 to my collection, because while a .310 H&I die can service a lot of different rifles and pistols, a .277 or .278 would be just for the .270.  That and I have several 06 rifles that I think can do whatever a .270 can do.  Of course that last is not literally true, but it's close. 

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BigMan54 posted this 30 March 2019

I don't have my .270 cast bullet stuff anymore.

But my notes give me 4 loads with 2 bullets, both Lyman, both sized .278 and cast of Pure Linotype. 3 shot groups. Tamarack 50/50 lube. Neck-sized, used Lyman M- die. 

#280473, 122grs - average weight. Crimped in the top groove, no lube in that groove.                                                                                                                          IMR4759 - 22.5 grs gives groups of  2.2" - 3.0" at 100yds, 50yd groups of 1.8" - 2.5".  Doesn't help much since that GREAT Powder is discontinued.   

H4895 - 28.0grs - 30grs, just a bit better in accuracy at 100yrds, about 2.5" at 100yrds, but nothing on 50yrds ???? No notes on why. But a Hot load, just a bit of Leading after 35+rds.

#2400 - 12.0 - 14.5grs. 3"- 4" at 50yrds. No 100yrd groups. Guess after the 50yrd groups I didn't bother to try.    

#Unique - same as 2400 but 12.0grs gave groups a bit under 2.0 inches. Sorta like 1.85" - 1.95".

The #280468, a Loverin semi-spitzer. Weighed in at 120grs. Same as #280473, no lube in the top groove, used it as a crimp groove. A light crimp, and I filled the grooves up to the crimp.   

Unique - 14.5grs gave great accuracy at 50yrds, no leading at 40rds. 1.5" - 2.0" groups. But went to heck at 14.0grs or 15.0 grs.  No recoil, a real pleasure to shoot.

But those light cast loads all needed a different aiming point. Thank the GOOD LORD for targ-dots.

I'm glad I kept the index cards with the load info in my LYMAN #3 Cast Bullet Handbook. 

But with all the new molds available, I won't get started again. To many guns, not enough range time.   

Do seem to remember that last mold gave Really Excellent Accuracy in My DAD'S    .270Win too.                                                                                                                  

 

Blasted auto-correct & weird entry. Can't fix that sentence position problem.

Long time Caster/Reloader, Getting back into it after almost 10yrs. Life Member NRA 40+yrs, Life S.A.S.S. #375. Does this mean a description of me as a fumble-fingered knuckle-draggin' baboon. I also drool in my sleep. I firmly believe that true happiness is a warm gun. Did I mention how much I HATE auto-correct on this blasted tablet.

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Hornet posted this 31 March 2019

   One of the amusing things about the .270 data in the old Lyman manuals was that they had a recommended load for all their .270 bullets of 16.0 Grains of SR-4759. This generally provided a REAL GOOD starting point. Other powders will work as well if you adjust the charge a little. I had a BUNCH of SR-4759 and used it a lot.

   My old #1 Ruger kinda likes the 280473 with about 15.8 of 4759, but it does fairly good with 16.5 of IMR-4227. It's not too unhappy with 12.1 of Green Dot either.

   The Lyman 280412 worked fairly well at Lyman's 16.0 of SR-4759 after I lapped the nose from .265 to .269. It also seemed to like about 11.0 grains of Green Dot or PB. The Lee C-277-135-RF is VERY similar and seems to like loads in this range although mine could use the nose lapped a tad bigger than the .268/.269 that I'm getting.

   The load I really like is the RBCS .27-150-SP  ahead of 17.0 Grains of SR-4759 with 18.2 of H-4198 running close. Either do very well indeed out to 250 yards or so. 

   All these loads do group well below the normal point of aim. I did notice that the point of impact tended to make a substantial jump upward when I boosted the H-4198 charge up into the 20 grain realm. I'm not sure why but for the paper punching that I was doing, I stuck with the lighter charges for a little bit tighter groups.

    Please note that older Ideal/Lyman molds tend to cast with much larger body diameters than I prefer. A couple of mine cast at .282 from wheelweights. I've been tempted to lap one out for the 7mm but have resisted. I do seat the gas check and lube in a .280 die and then size down to the diameter I need. This is not needed on the Lee or RCBS. I did not use any Dacron filler on these.

   Have fun with it.

 

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