I have a new respect for the 6.5x55 mauser, I want to build one for out to 600 deer hunting. Here is what I want.
A Remington 700 la or a Tikka LA
A Hart or Shilen 25" barrel
lighter than a Rem 5R barrel but heavier than a Rem standard barrel
will be used in a box stand so no bench rest type barrel
what am I missing? Or should I just buy a Cooper in 260 Remington?
I have killed deer out to 560 yards with this round but my 20.5 inch barrel kills my velocity.
I know there are probably some folks who will disagree with me on this, but I believe the only way a .260 Remington makes sense over a 6.5x55 is if you are trying to get Swede level performance in a short action. Otherwise, the Swede is the better cartridge. So, if you just want to skip the trouble and waiting involved in a build, then go ahead and get the Cooper.
Otherwise, go with whatever action you prefer as the base for your build. Your desired barrel length is just fine. For what you want, I recommend the Shilen #4 profile barrel. I have 6.5's in a Shilen #4 and a Krieger #4 and am very happy with them. I feel they represent a very good compromise. They are just heavy enough to sit steady in the hand or on a rest and just light enough to balance and carry well, IMO. I would emphasize the correct twist, however. The standard twist in most 6.5 barrels is 9 twist, which may be a bit marginal with VLD type bullets. My Swede wears a 9 twist barrel and shoots VLD's very well. That is not always the case for everyone, though. An 8 twist is much closer to the original spec for the Swede and is a safer bet.
I also strongly recommend that you use Lapua brass for your Swede. It is much less expensive than the same for 6.5-284 or .260 Remington. It will also be in proper spec vs domestic brass. It is good stuff and worth every penny.
Here is what I used to build my Swede:
Zastava Commercial 98' Mauser action
Shilen #4 Contour, 9 twist, 26" chrome moly barrel
Bell & Carlson Medalist Varmint synthethic stock w/full length aluminum bedding block
EGW picatinny style rail
Nikon Buckmaster 6-18x40 Mil-Dot scope w/Leupold QRW rings
Metal finished with matte black Gunkote
My rifle's best load is 48.2 grains of H4831 with Lapua brass and Berger 140 grain VLD's. With this load, it shoots consistently in the .3's and .4's @ 100 yards. I have been able to shoot well enough with it @ 600 yards to be able to consistently pulverize clay targets, even in fairly strong winds.
About the only drawback to the 6.5x55 is the lack of modern load data for it. Do your homework when working up a load and work up carefully from book starting loads. In comparison to the .260 Remington, the Swede tends to like slightly slower powders and has slightly greater case capacity.