Thread: 303/8*57

Strange as it may seem I have a 303 that shot a 4" group at 25 yards, as my son was keen to see what would happen if we cut the barrel a bit shorter we did so, over a year or so, it is now about 12".
With Hyland 150 grain factory 2040 average.
With 213 grain gas check 1028 average
Seeing as how it was a nice rifle to carry and worth a bit of effort I basically rebuilt it as a fully wooded carbine, sweated on scope mounts, bedded and so on and so forth.
Then I slugged the bore, this meant upsetting soft lead projectiles to a larger diameter, which required an upsetting die, a different size for each stage, about 10 different stages.
Finally I found contact with the grove, that is the cut grove in the barrel, the big diameter on the exiting projectile, at 0.323, one of the 8mm sizes, in fact 8*57. The bore diameter is a tight fit, on a standard 303 bullet, hard hammer, be very careful as it might stick type of fit
The fired case from this rifle is quite different from the standard 303, one of which I have and it will shoot a factory spec group at 100 yds, a very good rifle.
What I would like is a few 8*57 American standard loaded cartridges to try, or some 0.323" projectiles.
Can anyone help.