I had one back in early-mid '80's, and shot and loaded alot for it.
Most of the caveats that apply to loading the .30wcf in the leveractions apply to it as well. Only difference is that you CAN safely use the Pointed Spitzer style bullets in it.
The 340 is not as strong as most bolt actions and is the reason that it was never loaded in any real high pressure cartridges. The exceptions were the .222 and .223, mainly because of the extra mass of the barrels with similar contour and low bolt thrust of the smaller case heads was "OK", but some I've seen would render the brass essentially unreloadable after the first firing. (.223's)
I got very acceptable accuracy from mine, but it never equaled a Rem. m788 that I had a decade earlier. Remmy' would shoot 3shot clover leafs with 130gr Speer HP's and Imr-4320.
I loaded a few pointed bullets in it (m340), but I found that most of the pointed bullets are intended for higher velocity cartridges such as '06, and 300magnums, such that performance is less than desireable at nominal .30wcf velocities. (read very poor expansion at ranges beyond what you would normally use RN's anyway).
An exception was/is the 125gr Nosler Balistic Tip. Other good bullets are the 125gr Sierra PtSP, and 125-130gr Speer PtSP and HP. The Remington 125gr PtSP deserves some serious attention too. (Note it is not a "Cor-lokt", and is considered a "varmint" bullet in .308 and .30/06).
I got fabulous accuracy from my m788 and m340 with the Speer 130gr HP and IMR-3031. Approx 33.0gr if my memory serves me correctly.
These days, I use RL-15 for equal accuracy and 150fps greater velocity with 150gr Rem Corlokt RN's This bullet has a good ballistic coefficient and is "engineered" for optimal performance. It is now my GO-TO bullet for all .30wcf usage.
My 340 had the side mount and scope that it came with as a "package" when originally sold by Western Auto in the late '60's. Prior to my acquisition, the stock had been abused. I refininshed to orignial appearance and was a good shooter.
I primarily got it to shoot cast bullets, because of it's 6-groove rifleing was much better with .308-.309" bullets. It shot VERY WELL with a Lee .309 150gr FNGC over 28.0gr of IMR-3031.
I now find that my micro-groove rifle (Marlin/Glenfield m30) shoots .310-.311" bullets just as well, so I "Parted" with the bolt-action for some other "gotta have" project many years ago.
Some of the earlier guns didn't have recievers drilled and tapped for scope mounts. Because of the open top reciever, this gun requires a "side mount", but it centers the scope over the bore.
There are also some variants with a 24"bbl, and they have a "butter knife" style bolt handle. These in my opinion are the more favorable. An aquaintance had one of these with a Weaver K-4 scope. He had been around the world with it both in US military, and later as a Missionary. He had a number of exotic game heads he had taken with it. Even had some South African mfg. ammo that he claimed was unbelievable on "wart hogs". He had "head" to show for it too!
You should be able to find one for a reasonable price.
A good shooter if the bore is in good shape!!!!
and I have fallen in some sort of infatuation with this gun. Those in the know and who were around when the earth was still flat, will recall that they were also sold as Stevens 325/Springfield 840.
lol 
