6.5x55mm

mysticplayer said:
The Det mag will hold a cartridge with an OAL just under 3" which is more then long enough for any Swede to fit.
Click to expand...

Well, according to my Hornady manual, the 6.5x55 has a max OAL of 3.150" and I have a batch of 140gr. SST's loaded at 3.100" for a ladder test. At that length, the boat tail starts almost exactly at the end of the neck and ends about even with the bottom of the shoulder. My BSA CF-2 feeds these just fine and easily has room to go to 3.150" if I need to.

Jerry, do your pre-chambered barrels have a shorter throat to work properly with the 140gr. spire point bullets, or are they cut for the 160gr. RN bullets?

Mark
 
Mark, I would have to confirm but Shilen and McGowen are using SAAMI spec chambers which typically have shorter throats vs the old specs for the WWI/II Mausers.

Shilen uses PT&G reamers and McGowen would likely source from PT&G, Clymer and Manson. All good stuff.

Interesting, as my Hornady Manual lists the OAL of the Swede at 3.0". Seating a bullet a 1/16 to 1/8" below ideal is not that big a deal and certainly would not consume enough case capacity to matter.

But when a bullet is seated so that alot of it is below the neck/shoulder level, it impedes on case capacity reducing performance. This would occur in ALL 308 family chamberings using the heavier bullet for that cal to fit in a 2.8" mag.

In case there is concern, seating a bullet BELOW the neck shoulder does not make it any less accurate. At least at the 1/4 min level. The only thing it does is reduce effective case capacity.

Jerry
 
mysticplayer said:
Mark, I would have to confirm but Shilen and McGowen are using SAAMI spec chambers which typically have shorter throats vs the old specs for the WWI/II Mausers.

Shilen uses PT&G reamers and McGowen would likely source from PT&G, Clymer and Manson. All good stuff.

Interesting, as my Hornady Manual lists the OAL of the Swede at 3.0". Seating a bullet a 1/16 to 1/8" below ideal is not that big a deal and certainly would not consume enough case capacity to matter.

But when a bullet is seated so that alot of it is below the neck/shoulder level, it impedes on case capacity reducing performance. This would occur in ALL 308 family chamberings using the heavier bullet for that cal to fit in a 2.8" mag.

In case there is concern, seating a bullet BELOW the neck shoulder does not make it any less accurate. At least at the 1/4 min level. The only thing it does is reduce effective case capacity.

Jerry
Click to expand...

my manual lists at maximum 3.096 i believe
 
Odds are that is with the really long 160's to fit in the Mausers.

You will have no issue fitting any match VLD at the 2.95 to 3.0" length to fit in the Savage mag and still have excellent case volume.

Blygy, now have 2 Shilen 260AI's and think the throat is indeed ideal for the 120/130gr class of VLD/match bullets. The 139/140's will fit but will be seated a bit deep. I have pushed the throat out to get the OAL just under 3". Lots of case capacity now for the heavies.

Both are shooting in the 1/2" group at 200yds. Not bad for a rebarrel :)

Now to work on a couple of McGowens.

Jerry
 
How does a Stevens action, with SSS trigger, SSS or Shilen Barrel, Bell and Carlson vert. grip tactical stock and an elite 3200 sound for a start? Also looking at loads with high velocity powders, ie Hybrid 100v, to accomodate for the slightly smaller case cap., although I dont know what bullets would work well with that powder but that is why I have my trusty ol' Reloading Handbook!
 
That'll shoot just great. Also consider the McGowen barrels, I am having some very nice results with my new barrel.

PM me and we can discuss your build.

H4831SC is the standby for this cal and case capacity.

Let me know...

Jerry
 
I know Jerry likes the 4831sc for the 260 AI.. but depending on barrel length IMR7828SSC can be a stellar choice.. I have a 30" Shilen and I get 3200fps with the 123 Scenars.
 
mysticplayer said:
Interesting, as my Hornady Manual lists the OAL of the Swede at 3.0". Seating a bullet a 1/16 to 1/8" below ideal is not that big a deal and certainly would not consume enough case capacity to matter.
Click to expand...

Now you made me check, just to be sure. My Hornady manual is the 7th Edition, copyright 2007. Sure enough, maximum COL is listed as 3.150", but the load data all are loaded to shorter lengths. Their load with the 140gr. SST (as I have loaded) is shown at 2.905" COL. Go figure.

I also went and looked at the Hodgdon site to see what they show and they have the 142.gr. Sierra HPBT loaded at 3.050" and the 160gr. RN at 3.300". Lots of variation it seems.

Mark
 
Blygy, that is great to know about another powder option. More the merrier...

Mark, Bullets vary so much in shape and length that there is no magic number.

My 139gr Lapua loads are quite a bit shorter then my 140gr Berger loads - same seating die setting and same relation to the lands. However, the shape of the ogive of each bullet and their actual size means that you end up with substantially different OAL.

If you flip through a variety of manual, you will see huge variations in OAL's. They list whatever they tested at not necessarily what is ideal or necessary.

Now the kicker is there is never any notes about reamer specs and proximity to the lands. We even dont' know how much tighter their pressure barrels are - if they are different at all.

Big reason they always suggest you start low and work up. There are so many variables in the chamber, bore, bullet, brass, powder and primer that can affect what is ok.

Just set up the OAL to suit the rifle you have.

Jerry
 
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