win 94in 30-30

Rifle version. It's unfired, but I bought it with the intention of shooting it. Every time I take it out and sight it, I think this would be nice with a Lyman Tang sight. I also have a 94 that Gary refinished and made into a 30 GNR. Every time I shoot it I think, this would be nice with a Burris fastfire. Probably should get the fastfire mount as it's only a couple of miles away from me...
https://www.turnbullrestoration.com/gun/fastfire-barrel-mount-model-1892-1894/

Minor variations in thickness are probable but diameter should match up. It is an unusual problem. I've had early 94s where the carrier supports get loose and you have to fanagle tiny screwdrivers on the inside to tighten the screws. Yours is modern era gun without that problem. Your gun should be tapped for Williams peep sight. But I might be wrong.

see if there really is a difference. If there isn't, then you will know to look for some other issue.

Remove the tube and check where it goes into the receiver. There may be a dimple or a burr. That’s my best guess, and i don’t know why some ammo would feed, but other ammo wont.

seen numerous small problems like that with them. I heard many years ago from the Winchester factory rep that in a good economical move Winchester got rid of their less than perfect parts on commemoratives as 99% of them were never fired as that ruined the collector value completely. In fact on two of the guns named after an Indian chief (Sitting Bull, Geronimo, Two Dogs Humping, one of those, the guns with the tacks in the stock) I have seen 2 of them that had no rifling in the barrel. But take my comments on less than perfect parts as second hand or even third hand info.

If you have a good gunsmith in your area take it in there to them to check out. It could just be something small that can be taken care of on one visit.

There are a couple of side mount aperture sights that attach to the 2 small holes on the left side of the action. Also you can have a scope mount in a side mount added to the left side of the frame too although this required a couple of holes to be drilled.

If you like a red dot sight we have our all steel mount for whichever red dot sight you choose. This also requires a couple of holes to be drilled in the front of the action or on the barrel. So your problems are probably not anything that can't be fixed with a liberal application of $20 bills.

The rear buckhorn sight blade for one with a round hole to act as an aperature sight.
https://www.gunpartscorp.com/products/880560

that the screws are tight especially the loading gate. It may be slightly bent.