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M852 308W chamber reamer
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Hi, which is the difference between a M852 .308W chamber reamer and an "ordinary" .308 reamer?
 
Posts: 1459 | Location: north-west Italy | Registered: 16 April 2002Reply With Quote
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Picture of Mike_Dettorre
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I believe the M852 is designed to cut a precise match chamber for the 168 grain Sierra MK bullet loaded to the overall length that is specified for the US military M14.


Mike

Legistine actu quod scripsi?

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.




What I have learned on AR, since 2001:
1. The proper answer to: Where is the best place in town to get a steak dinner? is…You should go to Mel's Diner and get the fried chicken.
2. Big game animals can tell the difference between .015 of an inch in diameter, 15 grains of bullet weight, and 150 fps.
3. There is a difference in the performance of two identical projectiles launched at the same velocity if they came from different cartridges.
4. While a double rifle is the perfect DGR, every 375HH bolt gun needs to be modified to carry at least 5 down.
5. While a floor plate and detachable box magazine both use a mechanical latch, only the floor plate latch is reliable. Disregard the fact that every modern military rifle uses a detachable box magazine.
6. The Remington 700 is unreliable regardless of the fact it is the basis of the USMC M40 sniper rifle for 40+ years with no changes to the receiver or extractor and is the choice of more military and law enforcement sniper units than any other rifle.
7. PF actions are not suitable for a DGR and it is irrelevant that the M1, M14, M16, & AK47 which were designed for hunting men that can shoot back are all PF actions.
8. 95 deg F in Africa is different than 95 deg F in TX or CA and that is why you must worry about ammunition temperature in Africa (even though most safaris take place in winter) but not in TX or in CA.
9. The size of a ding in a gun's finish doesn't matter, what matters is whether it’s a safe ding or not.
10. 1 in a row is a trend, 2 in a row is statistically significant, and 3 in a row is an irrefutable fact.
11. Never buy a WSM or RCM cartridge for a safari rifle or your go to rifle in the USA because if they lose your ammo you can't find replacement ammo but don't worry 280 Rem, 338-06, 35 Whelen, and all Weatherby cartridges abound in Africa and back country stores.
12. A well hit animal can run 75 yds. in the open and suddenly drop with no initial blood trail, but the one I shot from 200 yds. away that ran 10 yds. and disappeared into a thicket and was not found was lost because the bullet penciled thru. I am 100% certain of this even though I have no physical evidence.
13. A 300 Win Mag is a 500 yard elk cartridge but a 308 Win is not a 300 yard elk cartridge even though the same bullet is travelling at the same velocity at those respective distances.
 
Posts: 10169 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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The M852 and the M118 is the designation of the Lake City Match (LCM) 7.62x51 round commonly used in Match Grade M14's.

The primary difference between the M852 and the M118 is the bullet. The M852 uses a commercially produced 168gr hollowpoint boat tail bullet and the M118 uses the 173gr full metal jacket boat tail produced by Lake City.

There IS a dimensional difference between the 7.62x51 chamber and the .308 Winchester chamber.

What did you have in mind?


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This is my rifle, there are many like it but this one is mine. My rifle is my best friend, it is my life.
 
Posts: 3171 | Location: SLC, Utah | Registered: 23 February 2007Reply With Quote
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On Manson's catalog I've seen a M852 match 308W reamer and a friend of mine is about to rebarrel an old Remington 700; he wants to turn it into an informal target rifle.
 
Posts: 1459 | Location: north-west Italy | Registered: 16 April 2002Reply With Quote
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I've used the 7.62/308 Match reamer from Brownell's and got, literally, one-hole groups with miltary M852 ammo. Your friend won't be sorry.
Regards, Joe


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Posts: 2756 | Location: deep South | Registered: 09 December 2008Reply With Quote
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By way of ancient history....Gene Barnett and I designed a 308 "Match" chamber back in the late '80s, early '90s based on the M852 round. Our goal was to achieve better accuracy with a tighter chamber that would still accept any round which met SAAMI specs. It needed to work in gas guns AND bolt guns. By happy chance, the dimensions we arrived at work extremely well with 168 and 175 Federal match, as well as Black Hills match 175.

The body of the M852 is the same as our std 308 Win. The neck, rather than tapering from .346" at the N/S junction to .344" at the case mouth, is a straight .343" diameter. Throat spec is
.309" x .075" x 1 1/2-degrees vs .310" x .090" x 1 3/4-degrees for SAAMI. Essentially, a slightly smaller neck combined with a smaller and shorter throat. The three rifles I have chambered in M 852 will hold 1/2 MOA out to 600 yds if I do my part.

Anyone wishing a copy of the reamer specs can e-mail me: david@mansonreamers.com.

Dave Manson
 
Posts: 699 | Location: Michigan | Registered: 04 November 2007Reply With Quote
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Hi Dave,

I use a Palma reamer which tends to work really well. How does your Palma reamer compare to the M852 Match?


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This is my rifle, there are many like it but this one is mine. My rifle is my best friend, it is my life.
 
Posts: 3171 | Location: SLC, Utah | Registered: 23 February 2007Reply With Quote
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Hello Westpac;

Palma chamber specs vary with the year of competition and the ammunition issued to competitors, so a specific Palma year would have to be specified--we don't have all of them by any means.

In general, the ones we've made have been slightly smaller in the neck and shorter/ tighter in the throat, depending on the wishes of the shooter/competitor. The M 852--as we've made it--has stayed the same since its inception. Hope this helps.

Dave Manson
 
Posts: 699 | Location: Michigan | Registered: 04 November 2007Reply With Quote
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Well, I certainly got an authoritative answer to my question Smiler . Thanks!
 
Posts: 1459 | Location: north-west Italy | Registered: 16 April 2002Reply With Quote
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