Found this article in an old guns&ammo the other day - 1993 November Volume 37, No. 11

Anybody whos got it should take a look - man would it be fun for Chucks.

heres a bit of data

Bullet Powder Grns. FPS. BL.
70 Nosler IMR 7828 74 4205 25"
75 Barnes X " " 73 3995 25"
WW 860 87 4150 28"
90 Barnes X " " 81 3850 28"
WW 872 86 3759 25"
AA 8700 78 3546 25"
95 Nosler WW 872 86 3643 25"
" " 86 3817 28"
WW 860 82 3680 25"
AA 8700 81 3640 25"
100 Nosler WW 872 85 3780 28"
100 Barnes X WW 860 82 3634 25"
105 Berger WW 872 85 3572 25"

This is based on a necked down 7mm Rem Mag Case

This is in 1993 and the author of the article says that people tell him that in all likelyhood the barrel will probably die around 100rounds but with moly and stuff now adays you could probably get more

looks like with a good load you could get under .5 inch groups with a clean barrel.

supposedly a very flat shot out to 400 yds.

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A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed !!

I built one of these about a year and a half ago for a friend. After doing some experimental work, he has gone on to shoot it for fun and some long distance work on game. Thus far the rifle has seen in excess of 1500 rounds, all above 3600 fps and some at 4350 fps and it still shoots under half inch without much sweat. We zeroed the rifle at 300 and it goes 7.3" low at 400 with a 65 grain monometal bullet at 4350 fps.

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Gerard Schultz
GS Custom Bullets

I wonder how it'd do in an XP-100...

I well remember that article. I was 18, a freshman in college, and excited about any hyper-velocity cartridge in circulation. Ross Seyfried was the author/creator of this intriguing toy. He reported that unless a rigorous barrel cleaning routine was adhered to, performance was less than satisfactory. He specifically recommended using J-B bore cleaner and or similar abrasive bore cleaners every 5-10 shots. Sounds like a lot of trouble, but immense fun factor! Also be mindful of the fact that ww 860 and ww 872 are not canister grade powders, but
military suplus powders that can and do vary quite a bit from lot to lot
.

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