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Old 10-27-2017, 08:25 PM
clawman clawman is offline
Join Date: Jan 2014
Location: Spokane WA
Posts: 1,935

Originally Posted by YATYAS View Post
Good questiom. Marine Corps M40 rifles are modified by Marine armorers. From my understanding, head space is a main factor in accuracy. I wonder if they mod the head space of each rifle to ensure the ammunition and chamber are a perfect fit.
I'm sure they have specs they machine to. The point is, they have a recipe for all rifles of the same caliber and it works. OMG they are accurate to well over a mile!
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Old 10-30-2017, 05:24 PM
Uncle Paul Uncle Paul is offline
Join Date: Oct 2008
Posts: 292

Clawman saw a show once where the armorers were building bolt guns from parts they started with the Remington receivers and machined almost every part of the gun to their specs and after it was done they developed a load that was for that specific gun only, I remember them showing the loaded boxes of ammo that had the guns serial # on it.With the newer guns and the semi autos Iím sure it just a ammo loaded just for the military to meet there specs.YATYAS I Googled your Question and lots of info on what youíre looking for but look up a formula developed by W.W.Greener it will get you in the ballpark I think
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Old 02-02-2021, 09:52 AM
AlanParker1989 AlanParker1989 is offline
Join Date: Feb 2021
Location: Atlanta, GA, USA
Posts: 3

With the two 6.5 creedmoors I've had with h4350 had there nodes at 42.4 and 42.5. I've pushed out to 43.5 before with no signs. They both loved the 143 eld-x and they perform great on deer.
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Old 02-03-2021, 07:21 PM
dvl2700 dvl2700 is offline
Join Date: Oct 2016
Location: Kalamazoo Michigan
Posts: 328

Our pistol team (MSP) trained with the Army Marksmanship Unit (pistol, Fort Benning) for a week back in 1998. We took a tour of the armour's unit. We discussed the competition rifles and sniper rifles that were built. We were advised if the rifle didn't accurately shoot the loads the loading unit were making, it went back to the builder for a new barrel and rework. We then went to the testing and reloading unit that reloaded all the competition ammo for the AMU Rifle shooters.
Very interesting that they used all new brass, sized the brass, trimmed to length, deburred, primer pocket uniformed, flash hole deburred/uniformed and then weighed the brass for uniformity. They then primed on one press, dropped powder on one measure (they were using RL-22 but would not tell us the amount), seated the bullet on another press, then crimped on another separate press. The technician that loaded would put their name and the information on a slip in with the ammo they loaded. The technician could do about 600 rounds per day.
They were also testing a 6.5mm round that I think was the precursor to the 6.5 Creedmore, but again were very tight lipped about the testing, firearm and use.
The pistol unit of the AMU tests different lots of match factory ammunition from their guns. When they find the best lot of factory, they order the whole **** lot from Federal, ie semi truck loads. Again if a pistol does not perform, it went back to the armourer. Guessing the same type of situation with sniper loads. Pick the best lot and tune the rifle and barrel to the ammunition.
BTW, a armourer who retired built all of my handguns for competition, and a couple of competition AR rifles for other teammates after he retired about a year later. Sam's Custom Gunworks.

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Old 02-04-2021, 06:55 AM
grizzley grizzley is offline
Join Date: Mar 2012
Location: NE pa.
Posts: 2,386

Originally Posted by dvl2700 View Post
The pistol unit of the AMU tests different lots of match factory ammunition from their guns. When they find the best lot of factory, they order the whole **** lot from Federal, ie semi truck loads.
I know a few benchrest shooters, when they find a certain lot # of powder that seems to shoot better in their guns, they will buy as much of that specific lot # as they can find.
As stated above, there are a lot of variables involved when it comes to making a weapon super accurate.
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