Enfield no.1 mk3 converted to 410

I bought a no.1 mk3* at a flea market yesterday, I tried a commercial 410 shell but it would not fit then I tried a fired .303 case and it fit. Does that mean it is still for the Britt. 410 round and if so would it be more of a collector piece than if it had been reamed to commercial 410 round? The gun still has cosmoline all over it. It is marked ENFIELD 1917, Sht LE III*, on the left side it is marked 410, RFI 1935. Could this gun have been in storage all this time? All the numbers match and the bore is in excellent condition. On the trigger guard there is an aluminum strip with number stamped on it. Is that an import number? There is no import stamp anywhere on the gun that I can find.
Can rounds still be found that will fit?
Any information or opinions are welcome.
Thanks in advance,
Howard

Liberty Tree Collectors has it. https://www.libertytreecollectors.co...&idcategory=12 & I have seen it somewhere else but cannot recall.

The aluminum strip is likely an old Springfield Sporters inventory tag. The imported quite a few of these guns.

What you have is an unmodified (therefore, in my opinion, more valuable as a collector item) Lee-Enfield Musket used by the Indian Government for policing type duties. If you search on .410 musket you will find plenty of reference on the www.

They are always conversions of regular SMLEs In your case you have a an SMLE Mk.III* made at the Royal Small Arms Factory, Enfield Lock, Middlesex, England in 1917. It was converted to a .410 musket at the Rifle Factory, Ishapore, India in 1935.

This is the best site regarding the ammunition they use. .410 inch Indian Musket Ball, Blank Buckshot - British Military Small Arms Ammo

Somebody cases of .410 and was offering it for sale as well. Cheaper than dirt or someplace like that, so you can shoot the thing with proper ammo.

have a few an they are fun to shoot lots of fun. ammo is avaible now cheaper than dirt an dan's sporting good's

I want to thank all of you for your replies and information that is very helpful.

Cheaper than Dirt thats it. Probably cheaper than Liberty Tree.