280412 question

[oneokie]

If anyone has this mould, what is the diameter of the nose?

[Tom Myers]

If anyone has this mould, what is the diameter of the nose?

This is the dimension sketch of the Lyman Ideal Mold #280412 that I have on hand. When I had a 270 it shot quite well when cast from wheelweights.

Hope this helps.

Tom Myers,
Precision Ballistics and Records (http://www.tmtpages.com)


http://i164.photobucket.com/albums/u35/dutchtom/280412_sketch.jpg

[fatnhappy]

I just saw one on ebay and damn near bought even though I don't have a .270 (go figure)


I'd love to see this one scaled up .007" It'd be slightly lighter than the 287308, which seats deeply in my 7-08. Knocking 10 grains off it would help.

[ktw]

I have an old single cavity copy (HP). I don't currently have any cast up to measure.

I seem to recall the nose had a slight taper to it, not as straight sided as the one in Tom's drawing. Mine did not "bore-ride" for anything more than a very short distance above the scraper band.

I would be interested in something closer to a 311291 design scaled to fit a 270 cartridge (true bore-rider with appropriate nose dimension).

I'll cast up a few to measure sometime in the next few days. Now you have me curious, too.

-ktw

[HORNET]

Got a single and a double cavity, both rather aged (early 70's). They originally cast close enough to identical that a boolit would fit any of the 3 cavities. They checked .282 over the driving bands but only .266 on the nose. Results were NOT good. Ended up lapping a wide band (the compound spread out on me) on the nose of the single cav. and got it up to .270. It now shoots as well as the RCBS 27-150-SP. Mine likes about 17 gr of SR 4759 with a Rem 9-1/2 and seated firmly into the rifling.
fatnhappy, you could get it and paper-patch to get the size up to fit a 7mm.

[oneokie]

Thanks for the responses.
Now for the kicker. [smilie=1:
Have a Carcano carbine, 17" barrel. Groove is 0.272" and bore is 0.258". Being the tinkerer that I am, it occurred to me that a boolit for the 270 would maybe be easier to make work.

Hornet, you posted while I was typing. Hummmmm. Your experience sounds very promising.

[ktw]

I cast and measured a few from my old single cavity Ideal Hollow Point mold.

.2825"-.2830" on the drive bands.
.2660'" on the nose for a little less than half the nose length.

-ktw

[Nelsdou44]

Oneokie,

FWIW, I'm gonna try this in my Carcano. Got a box (100) lapping boolits from Beartooth Bullets in .277 (270), approximately 140 grains. Since they come "soft" I heat-treated and water dropped, waited a week, then lubed 'em up, slapped CGs on and ran them through a Lee sizer at .269.

The reason for heat-treating is that trying to push 'em through the sizer "as-is" causes them to rivet-up in the die mouth; just too soft to push for that amount of sizing. You may have better luck trying something like this if you only need to get down to .273.

Nels