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Slug, Measure, & Match: Using the Right Bullet for the Right Barrel Diameter
By Mark Trope & R. Ted Jeo

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6mm USN

Author	Comment
Colin	6mm USN	Lead	[-]
Posts: 2002 (06/12/09 11:54 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Tags : None At the last Houston show I picked up a 6mm USN rifle to go along with my ommercial Winchester 6mm sporter. I have some brass from Buffalo Arms, made from 25-06 (?!). Does anyone have any good loads for the 6mm, preferably with a rather slow powder like 4064 or 4350, and with a rather heavy bullet, like the 105 gr Speer? Also does anyone know of a source for 6mm bullets heavier than the 105 gr Speer?
Parashooter		#1	[-]
Posts: 1669 (06/13/09 12:34 AM) Veteran member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	It would be a lot of work making 6mm USN brass from .25/06, since the '06 case is significantly fatter. 6mm Navy is basically a .30 Army necked down and made rimless. Quickload predicts about 2600 fps and 37,000 psi with 36 grains of IMR4350 and the Speer 105 RN, based on a case capacity of 51 grains H2O. Wouldn't want to go there without working up very carefully. Last Edited By: Parashooter 06/13/09 12:47 AM. Edited 1 times.
beanstrung		#2	[-]
Posts: 5256 (06/15/09 09:39 PM) Forum Site Moderator Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Is the 6mm Lee-Navy truly "rimless"? I know that the .220-Swift, which was supposedly based on the 6mm Lee-Navy, is "semi-rimmed". --------------------------------------------------------------------------- What part of "shall not be infringed" don't you understand? Joel 3:9-10
akitaholic		#3	[-]
Posts: 721 (06/15/09 10:15 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	I believe the semi-rim was put on the Swift to fit an '06-sized bolt face. 'holic
Parashooter		#4	[-]
Posts: 1670 (06/15/09 10:40 PM) Veteran member Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Not sure, since I've never seen one in person, but that's supposed to be 6mm USN on the bottom of the picture and it sure looks like a true rimless to me. FWIW, .220 Swift probably had its rim made larger than the base so Winchester wouldn't need to add another bolt-face size to their rifle production. Swifts normally headspace on the shoulder, not on the rim as a "real" semi does. Drawing from QuickLOAD says rim is .448", base .443" - probably not difference enough to call it a semi and nowhere near the Swift's .473"x.448".
Colin		#5	[-]
Posts: 2003 (06/16/09 05:35 PM) Reply Quote More My Recent Posts Message Me Connection Blocking Invite Ignore User's Posts Report Post	Thanks for the load info, Parashooter. I've been using 31 grs of IMR 4064, and have had no trouble. But I think that considering the bore diameter/barrel length ratio, particularly with the 28" barrel of the military rifle, IMR 4350 would be a better choice. I'll probably drop the load about 10%; 32 grs, and work up a little. I won't work up much as there's no sense stretching the old girl. Incidentally, my Speer 105 gr bullets are spitzers; I didn't know they made an RN, and El Paso Gun Exchange (where they exchange guns for money) doesn't carry a 105 gr RN. I don't know why Buffalo Arms had their 6 mm USN cases made from 25-06 (they had plenty of 25-06 cases on hand they didn't know what to do with? The standing-up-in-a-canoe theory of case formation?)but that's what they're headstamped. They show no signs of being turned down at the rear, so they were probably swaged down. Don't know if that much of a reduction in base diameter would have reduced the primer pocket diameter, but if so they must have reamed out the pockets, as large rifle primers fit OK. The cases work fine in both an M1895 military rifle and a Winchester-Lee sporter. They left the case necks VERY hard, and after the first firing I annealed them. I got a box of 6mm rounds with the sporter: the box is Winchester but most of the rounds are Remington-UMC. All are soft nosed sporters. Winchester cases measure .444" at the rim and .442" at the base of the case just ahead of the extraction groove. Remington cases measure .442"/.440". It's a rimless case. Last Edited By: Colin 06/17/09 12:13 AM. Edited 2 times.

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