Evolution of standard 5.56 loadings, tracers excluded, including some of the lesser known experimental types.
-M193 55gr, 9/63
-M202 58gr Penetrator, steel tip made by FN, precursor to the SS109,
-XM287 68gr Ball, copper jacket/lead core, used by SEALS & Marines in Vietnam with the Stoner 63 LMG variants, produced by Canadian IVI, a 77gr version made by Netherlands/NWK (Mauser) was tested but not widely used. 1/69
-XM777 55gr, shorter version of SS109 bullet, 1/76
-M855 62gr, Steel Tip, US version of FN SS109, 10/80
-Mk.262 77gr open tip match/Sierra match king, used in the Mk.12 SPR, 5/02
-Mk.318 62gr, copper jacket/forward lead core/copper rear penetrator core, adopted by the Marines temporarily until the new M855A1 was ready, 2/10
-M855A1 62gr lead free, reverse drawn copper jacket over copper core, exposed steel tip, 6/10
I don't know what the powder charges are, but I believe I have modeled each bullet's structure accurately, so the case capacities should also be accurate.
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