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Image of 3 shot group

I paid $125 for a sporterized 1941 Kokura Arsenal Arisaka in 7.7 Jap at a pawn shop..... with "no functional guarantee"

I cut the breech off a new unused Winchester 25-06 take off barrel and cut metric threads for the Arisaka.

I chambered it in 257 Roberts.

I steel block bedded it. I put a Timney trigger in it.

On sighting in in 2017 it shot a 1" (3) shot group at 200 yards with 100 gr Nos Bal tips

1" 3 shot group at 200 yards
100 gr nosler ballistic tip 46 gr IMR-4451 2.963" OAL jammed into the lands
63.4 kpsi 3231 fps Quickload
2926 fps chrono
2936
2911
Pressure on primers looks high

I hunted with a different rifle in 2017, a 6.5-06.
Still, the 257 Roberts was a success at making a lightweight and accurate hunting rifle.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps