Unfortunately, there's no such animal as a "factory sporter." In the early 60s, one of the importers cut down a few thousand long rifles into a "handier" arm, but it was slap-dash work. Yours might be a home project - hard to say for certain.
"Sideways bullets" sounds very much like a bore diameter issue. The majority of the Carcanos have a .2675" or close bore. Which means a .264" bullet won't do very well accuracy wise.
I'd say if you wish to continue shooting it, 1st order of biz is to slug the bore. If it's noticably over .264" then you might wish to consider using the 160 grain, .268 bullet by Hornady.
Proceed with caution here. Use only W760 or H414 in conjunction with magnum primers. Any other combination of powders and primers is unsafe due to pressure spikes.
I have 1st hand experience with this and it's to be avoided at all cost. Before the safe data became widely available, I was experimenting with a moderate load of IMR 3031 and had a pressure spike. The primer disappeared, and the pressure was so great, the case head markings were completely obliterated. I had to pound the bolt open.
I doubt I can adequately explain what causes the pressure spikes with other gunpowders and non-magnum primers... the matter is explained in the latest Hornady reloading manual or you can call their toll-free # and they will e-mail you same.
The crossed rifle mark basically means the rifle has the potential for accuracy. In full military configuration and with mil-spec ammo. You throw in variables like altered rifling and handloads, you can pretty much forget that.
At one point, I experimented with sizing down 130 and 150 grain 270 bullets to .268", and that was going pretty well. I had some decent groups and thought I had hit the big time with a new idea.
Not to be. The ballistics techs at Hornady told me that's a very bad idea that could wind up wrecking the rifle and possibly me. Well, I figure they do that for a living, and I'm not much of a daredevil, so I abandoned that.
Now I just shoot the .268 160 grainer with a load of H414 right from the manual that approximates the original military velocity. With magnum primers, of course. My mug isn't much to behold, but I don't care to have it too close to a wreck.
Given your account of poor accuracy... if the rifle was mine... I believe I'd retire it in favor of something in full military dress. Or you could experiment with cast bullet loads - those are pretty safe. Generally speaking. I ain't signing anything that way. SW
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I can not find any thing on the internet that looks like it in other imformative websites. ,, I also see there is another one like it for sale to.. is this going to be a good shooter,, I hope so...