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View Full Version : .277 / 6.8mm (280) mold descriptions for Lyman / Ideal molds



ohland
11-16-2013, 12:25 PM
Scrounged up some descriptions for .277 diameter molds from a variety of sources. If some of you-all have better descriptions from Ideal or Lyman catalogs, please post to this thread with the correction or description of the boolit.

Disclaimer: It is well known that (at times) cherries have been used too long, with undersized cavities resulting. Some throats are too big compared to the groove diameter. Over time, manufacturers held different tolerances and dimensions for the chamber and bore. Different alloys will turn out different diameters. What follows below is simply a collection of the various Ideal and Lyman mold descriptions, which does NOT mean that any particular mold will cast a boolit like you expect. What does this mean? Slug your bore if you don't know the bore/groove dimensions for your gun. If the mold is undersize, you may have to beagle / lap it out some. [ed]

NOTE: Any loads mentioned are taken from period documents, and are not in any way tested. Please refer to modern loading manuals for safe loads. [ed]

v/r,
A fellow servant to the heavy metal :coffeecom

.277 is the proper diameter of bullets for the 270 and 6.8mm SPC.

280411 Fine sharp pointed bullet for .270 Winchester for small game such as grouse and squirrel. (PB, SP, 138 – TP is 411)

280412 A fine bullet for target shooting up to 200 yards and for larger game. (GC, RN, 136 – TP is 468)

280468 Designed by H. Guy Loverin. Excellent results with target work up to 600 yards and fine on larger game. Furnished in 115 gr. ("L" 6 bands) or 105 gr. wt. ("S" 5 bands). NOTE: 105 gr. 5 bands, and the gas check will fit inside the 6.8mm neck [ed.] (GC, RN, 105, 115 – TP is 468)

280473 Spitzer gas-check bullet, designed after the 311413 bullet. (GC, SP, 125 – TP is 473)

280642 150 gr. FN GC [6xx series, must be newer. ed.]

Moonie
11-25-2013, 11:14 AM
I have a dual cavity Ideal 280412, shoots well in my 6.8 SPCII AR.

ohland
11-25-2013, 09:53 PM
Where is the gas check, below the neck? The 412 is spitzer, right? The long spitzer nose might fit the throat better than the Louverin style bullets. I wonder if my T/C is SPC or SPC II...

Moonie
12-02-2013, 01:05 PM
The 412 is a round nose, gas check is at the bottom of the neck.