Great response .35remington said:I read the article listed and I have a few questions and a few comments based on the fact that the author of the article left out some very essential information that might make the conversion quite a bit less than he said it was. If anyone can throw some light on this, please jump in.
First, the longer case means many .35 bullets will not work as long as they are crimped in the crimping groove, in 200 grain weights and above. Unless the ejection port was modified (didn't see it) and maybe the feeding mechanism as well, the .358 loaded to standard length won't work. In the 336 action around 2.55-2.57" is maximum. The .358 conversion exceeds this with almost anything but the 220 and 180 Speer bullets. These have the shortest nose length above the cannelure of the .35 bullets I have on hand, measuring .525." Add this to the 2.005" to .2015" .308 case and it works, but just barely. On 200 grain bullets, it really isn't possible to make another cannelure ahead of the existing one, because the curve of the ogive has already commenced. The Hornady 200 RN measures .645" ahead of the cannelure, the Remington 200 RN .595" Both will not work, as total length exceeds 2.6."
I think the 250's have no chance, because there is even more bullet ahead of the cannelure with those than the 200's. Being limited to the 180 and 220 Speer bullets for big game is not so bad, because they would be fine in the .358, but it's something you might need to know.
See the bullet loaded in the .358, pictured next to the .35 Remington cartridge for comparison? That looks very, very much like the 147 grain 9mm bullet he mentions in the text that he got to fly at 2900 fps. Notice it has no cannelure visible, or if there is one, he didn't use it. This bullet is intended for around 1100 fps velocities. It is not a big game bullet, and unless it hit anything but ribs on a full broadside shot I would be willing to bet it's not much of a deer bullet either. That thing would blow up like a plastic tipped .22 varmint bullet, and very likely would be even more fragile than that. Even the .22 plastic tips don't expand at 1100 fps, and that 9mm hollowpoint will. I'd use it for varmints only, or nothing bigger than about 80 lbs, no matter what kind of critter.
Microgroove rifling hates undersized bullets, either cast or jacketed, usually because rifled diameter of the barrel runs .358" plus in many rifles in .35 Remington. It will shoot .357" pistol bullets pretty well if they have a long bearing surface. 9mm bullets go .355." That's almost a rattle fit in some guns. Stick with pistol bullets of .357" for varmints. They also have a cannelure to crimp in. Most 9mm bullets don't.
Pressures also have my attention. The .358 pressures may run higher than the .356 was loaded to. Yes, I know, both say 52,000 CUP, but CUP is arbitrary and varies by cartridge. I suspect 52,000 CUP means 60-62,000 psi for the .358 and about 46-50,000 psi for the .356. Ever see transducer figures in psi for the .375, .307 and .356? I haven't. I suspect we never will. I don't think anyone wants you to know just what the pressures in cartridges like the .375, .307 and .356 were, either in factory loads or handloads. We're dealing with a lawsuit happy society, and I believe factories and handloading manuals limit pressures in traditional lever actions to more modest levels than in bolt actions. No safety margin exists due to very poor gas venting from any type of primer leak or case failure. Not good. The lower pressures are there for a good reason, in my opinion. High pressures also cause extraction issues, poor case life and early casehead separations in lever guns of this type.
Reader's Digest version? Due to necessary shorter overall length, deeper bullet seating, springy rear lockup, poor gas handling and poor extraction characteristics, a lot of loads listed for the .358 may NOT be safe in the conversion. My opinion.
But it's a free country, and your eyeballs are your own to destroy.
I learned, from another forum, that Marlin made less than 1000 .35 Remington 336's last year. I am afraid they will drop it, and no matter what you think about it as a cartridge, it is certainly at least the equal of the .30-30 and a very viable alternative for those of you that just want to be different. It deserves to stick around. If the factory ballistics sound unimpressive, shoot the 200's at 2200, the 180's at 2400 and the 220 Speer at 2120 or so. You will still be fine, pressures will still be low, and you will have around 2200-2300 ft/lbs. That's plenty for most hunting you will do.
Loaded safely and to pressures I would be comfortable with, the .358 conversion would offer some performance gain over the regular .35 Remington, but if you are getting more than .356 ballistics I would suggest you are pushing the limits of safety too far. For myself, if I needed more punch than the .35 Remington, I would drag out the .45-70 and know for a fact that I had a noticeable increase in power.