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September 1st, 2020

Can’t Find Varget for Sale? Then Try IMR 4166 Powder…

IMR 4166 Enduron Varget powder Hodgdon

Can’t find Hodgdon Varget on dealer’s shelves? then consider IMR 4166. This Enduron series powder is temp-stable and accurate. It also offers good load density and meters reasonably well. Importantly, it seems to be a good substitute for “unobtanium” Varget powder. On the official Hodgdon/IMR burn rate chart, IMR 4166 is between H4895 and Varget. Some of our Forum members have reported excellent results with IMR 4166 in cartridges that work with Varget, such as the 6mmBR, 6 Dasher, 6.5×47 Lapua, and .308 Win. One member wrote: “in my 6.5×47 … IMR 4166 gives speeds and accuracy pretty much exactly the same as Varget.” And other shooters have observed reduced copper fouling with Enduron series powders, so IMR’s Enduron anti-fouling chemistry does seem to work.

IMR 4166 Enduron Varget powder Hodgdon

IMR Enduron powder 4166 Varget RL15Where to Find IMR 4166 Powder
Powder Valley Inc. (PVI) and Midsouth Shooters both have plenty of IMR 4166 in stock right now. IMR 4166 performs well in the .308 Win (for bullets up to 175 grains) and in 6mm cartridges running the heavier (95-107gr) projectiles. IMR’s press release states: “IMR 4166 [has] a perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250 Remington… and dozens more.”

IMR 4166 is one of IMR’s Enduron family of propellants. Enduron powders are formulated to reduce fouling and to be stable across a wide temperature range. If you commonly use Varget, Alliant Reloder 15, Norma 203B, IMR 8208 XBR, or Vihtavuori N140, you might want to try IMR 4166. It is available right now at Midsouth Shooters and Powder Valley in both one-pound and 8-pound containers:

Midsouth IMR 4166
IMR 4166 – 1 LB. — $29.01
IMR 4166 – 8 LBS. — $208.34
Powder Valley IMR 4166
IMR 4166 – 1 LB. — $28.50
IMR 4166 – 8 LBS. — $206.00

For more information and LOAD DATA visit IMRpowder.com and navigate to the Hodgdon Reloading Center. You’ll also find official load data in the Hodgdon 2020 Annual Manual.

Permalink Bullets, Brass, Ammo, Hot Deals, News, Reloading 2 Comments »
June 12th, 2019

Powder Spotlight — Reloder 15 and Norma 203B

norma 203B Reloder 15 berger load manual

In response to a Bulletin story about 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 News 1 Comment »
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 »