5 Groove barrel?

[JasonA]

Real quick question. Shot my Eddystone last weekend. I only shoot mild reloads of 2400 behind cast bullets, so I was running a cleaning patch down the bore to get the unburned powder residue out and I noticed that it was a 5 groove bore. The rifle is a WWII rebuild with a barrel marked H. S., which I assume was a high standard replacement. I was under the impression that all replacements were not 5 groove. Anybody got an idea????

Information

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[Calif-Steve]

A H.S. made barrel is a High Standard barrel, it is a 4 groove barrel. Are you certain it is a HS barrel?

[JasonA]

A H.S. made barrel is a High Standard barrel, it is a 4 groove barrel. Are you certain it is a HS barrel?

I'll recheck, but the barrel is stamped H. S. with no date of manufacture. It has the usual flaming bomb ordinance stamp and the patch had carbon fouling in a 5 pointed, equidistant star pattern. My '03 barrel patches don't look like that. I was confused. Could it be an original barrel from 1918 or 19 that was incompleted and high standard installed it and stamped it??? Just a thought. I will photograph the barrel and patch later this week. I teach and coach football and it is a little busy right now.

[Chuckindenver]

HS barrels for 1917,s are 5 groove right hand twist.

[JasonA]

Thanks Chuck. Hope your year is going well...
Jason

[Chuckindenver]

thanks...life is good. busy...but good. wearing out a great motorycle for sure.

[Cdn303]

Why look at the dirty patch to count the rifling. Just look down the bore and count the lands and grooves.

[RC20]

One, two, three uh, ok, one two, uh ok, one, two, three uh.

Easier to get a dental pick and index it and count but the patch works just fine.

[Jerome Cooper]

I have 3 1917's and shoot cast in all of them. I found that bore-rider design of the bullet does better than any of the other types of cal. 30"s that I have. Specifically Lyman #311334 which is an older and out of production mold...that I have always used with a 2 groove O3-A3 gives me the best grouping/accuracy. I believe that the 5 groove rifling where the lands occupy a larger part of the bore circumference, similar to the two groove configuration of the O3-A3, needs a bullet that has a shorter bullet body and a long nose that is positively guided by the increased land surface in both rifles. J. Cooper

[JasonA]

Totally agree. Long nose "bore riders" give me the best accuracy. I like a 311290 also. Another bullet I like is a 311413. It isn't as much a bore rider, but it delivers great accuracy with low velocity. You can't speed it up. 11 grains of unique, no recoil and a happy day!!!