September 13th, 2015

IBS Gear Spotlight: Steve Jordan’s “Log-Splitter” Heavy Gun

Can you really make a silk purse from a sow’s ear? Would you believe a winning benchrest rifle could be constructed with a stock fashioned from a cast-off log-splitter? Well it can.

Anyone who has attended an IBS benchrest match knows that this brotherhood of shooters includes some “backyard engineers” who can build amazing things with low-cost components. Consider Steve Jordan. He has built a winning Heavy Gun with a gunstock made out of a wood splitter. Check out the photo. The butt section is in the shape of a “V” like an ax. The “V” sits on an adjustable, flat rear sandbag. The flat shaft of the wood-splitter, running horizontally, serves as the main chassis and fore-end. The barrel block sits on top (with the action floated), while the flat, forward section of the shaft rides the front bag. Not only does this “log-splitter” stock work, but Jordan has won IBS matches with it! Sometimes simple and cheap beats expensive and fancy.

Sam Hall Says the Log-Splitter Has Been “Kicking Our Tails”
Sam Hall (multi-time IBS 600-yard champion) reports: “I was not at the first match where Steve Jordan debuted his barrel-blocked, Heavy Gun stock made out of a wood splitter. From what I heard he cleaned house with it that day. When I first heard about this log-splitter rig, I thought guys were pulling my leg. But the log-splitter Heavy Gun really exists. In fact, over the past two years at Piedmont, Steve’s home-built log-splitter HG has won numerous Heavy Gun matches, out-performing nearly all the other Heavy Guns on the line, even those that cost thousands more to build.

Steve made the rifle as economical as possible. Steve’s entire stock is made from a metal wood splitter. From what I understand, Ray Lowman gave him the barrel block. This rides on the shaft of the wood splitter. With this inexpensive, simple rig Steve has been kicking our tails! By the way, Steve’s Heavy Gun is chambered as a 6mm Dasher.”

Accurateshooter.com International Benchrest Shooters

Permalink Competition, Gunsmithing 3 Comments »
September 13th, 2015

Alliant Reloder 15 Vs. Norma 203B — The Numbers Tell All

norma 203B Reloder 15 berger load manual

In response to our Bulletin story about the availability of Norma powders at Midsouth Shooters Supply, one of our Forum members asked: “I’m having trouble finding Reloder 15 for my 6.5×47 Lapua — should I consider running Norma 203B instead?” As we’ve explained before, these two powders, both made by Bofors in Europe, are very, very similar. Here are some hard numbers that should demonstrate how virtually identical these powders really are.

Target Shooter Magazine writer Laurie Holland compared Norma 203B and Reloder 15 using data from QuickLOAD. Laurie also checked load manuals to see how listed charge weights varied for the two propellants. Laurie concluded there was very little difference between Norma 203B and Reloder 15.

Laurie Holland RatonNorma 203B vs. Alliant Reloder 15
Commentary by Laurie Holland

Running [203B and RL15] through QuickLOAD doing a ‘charge table’ run for a 130gn Berger VLD at 2.700 COAL in 6.5X47 Lapua, gives very similar positions in the table [for both powders]. The charge required to achieve 62,000 psi estimated pressure varies by a mere 0.2 grains between the pair, Norma 203B being the heavier of the two. The estimated Muzzle Velocity (MV) also varies by a mere 2 fps, RL15 estimated to produce 2,946 fps MV compared to 2,944 fps for N203B at 62,000 psi (with the parameters I used).

If they aren’t the same thing, they’re so close as to make no difference and as Forum Boss points out, they’re made by the same people (Bofors) in the same plant.

[The Berger Reloading Manual includes data for both powders] for the .308 Winchester and heavier bullets (185 to 230 grains). Maximum charges and claimed MVs are not always identical, but are so close as to be marginally different production lots of the same thing, or maybe the result of minor testing variations.

.308 Win Max Charge Weights in Grains (RL15 / N203B) (Berger Manual)

norma 203B Reloder 15 berger load manual

MVs [for the four bullet types] are close but not identical, the largest difference being for the 210s which shows RL15 producing 2,428 fps MV v 2,383 for Norma 203B.

Norma 203B Chemistry
According to the Norma Reloading Handbook #1, Norma 203B has the following composition:

85% Nitrocellulose
7.5% Nitroglycerin
2.0% surface coating
4.6% Various chemicals
0.9% Water

3,957 J/g specific energy
890 g/l specific density

For comparison, the 7.5% NG component compares to 15% in Viht N500 series powders and 10% in Ramshot TAC / Big Game / Hunter.

Permalink Gear Review, Reloading 4 Comments »