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Dear Friend...The normal groove for the .303 British is .312", but there was a lot of variation. Best slug the bore and order a bullet a thosandth or two larger. These rifles have a long throat and work best with the heavier weight bullets. The long neck and somewhat thin brass works great for cast since the lube grooves are covered. Many of the various "Marks" have oversize rear chambers. The best thing to do is to let the bullet push into the grooves slightly on the first loads. this will align the hull and it will expand evenly on all sides. After that neck size. Any cast loads for the .30-40 Krag works good in these rifles. The best of all for cast was the Lee Metford with the metford type lands and grooves, but to find one with a nice barrel is next to impossible. The early cordite loads were a horror on barrels. It seems like the slower powders work best and the thin brass on the necks expand well to seal with lower pressure loads. If I rember correctly the military load was a 215 gr spitzer @ 2010 '/" and can be duplicated. The sights were battle sights and will need a new blade filed to zero at 100 yards. After that the marks on the sight work fairly well.
Best Regards, James
Check that rifle to see if it was drilled and tapped for a side mount. The sniper rifles ahd an added cheek rest!!! jcg

(Edited by James Gates at 6:23 pm on Mar. 10, 2001)
 

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Jack...His rifle sounds like a "Rifle No. 4 Mark 1 (T)" with that added cheekpiece and the two scope mount holes? What do you think? Did those have select barrels, etc? Regards, James
 
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