Lapua 338 Lapua Mag 300gr Scenar OTM – Superb 10 Round Box

Description

Lapua 338 Lapua Mag 300gr Scenar is the load that built the reputation of this cartridge at extreme range. Lapua catalogues it as 4318013, pairing the 300 grain Scenar OTM bullet, bullet code GB528, with Lapua brass and a charge developed around a 27 inch test barrel. Muzzle velocity is 2690 fps for 4821 ft-lbs, and the G1 ballistic coefficient of 0.736 is what keeps it supersonic well past 1500 yards.

• Why This Load Set the Standard
• Published Ballistics for Lapua 4318013
• Honest Notes Before You Commit

Why This Load Set the Standard

The Scenar is an open tip match bullet with a long secant ogive and a boat tail, made on tooling Lapua controls end to end. Jacket concentricity and weight sorting are tight enough that most shooters find no benefit in sorting factory rounds by hand. That consistency is the entire argument for buying 338 Lapua Magnum match ammo rather than assembling your own, at least until you have the load development time and the components to beat it.

Ballistically, the 300 grain Scenar OTM sits in a useful place. The G1 BC of 0.736 and G7 of 0.368 mean it stays supersonic to roughly 1600 yards in standard conditions, which is why this cartridge and this bullet became the default for military and competitive shooting past a mile. Wind calls get easier because the bullet spends less time in the air, and the wind drift difference against a lighter 250 grain load becomes obvious past 800 yards.

Lapua brass is the other reason people buy this. The cases are thick, uniform and famously long lived, and handloaders routinely report ten or more firings with sensible pressures. Buying this long range precision ammunition and keeping the brass is a legitimate strategy for anyone who intends to reload the cartridge later.

Published Ballistics for Lapua 4318013

Published figures come from a 680 mm test barrel, roughly 27 inches. Barrels shorter than that will read lower, and 26 inch tactical rifles commonly chronograph in the 2600 to 2650 fps range with this load. The bullet requires a 1-10 twist or faster to stabilise properly.

• Product code: 4318013 (bullet code GB528)
• Caliber: .338 Lapua Magnum
• Bullet weight: 300 grain (19.4 g)
• Bullet type: Scenar open tip match
• Muzzle velocity: 2690 fps (820 m/s)
• Muzzle energy: 4821 ft-lbs (6536 J)
• Ballistic coefficient G1: 0.736
• Ballistic coefficient G7: 0.368
• Required twist rate: 1-10 inches or faster
• Test barrel length: 27 inches
• Quantity: 10 rounds per box
• UPC: 6418267103091

Honest Notes Before You Commit

Cost is the first honest caveat and it is a large one. Ten rounds of Lapua 338 Lapua Mag 300gr Scenar ammunition costs more than a case of 5.56, and there is no way around that. Anyone shooting this cartridge in volume ends up reloading, which is exactly why the brass matters so much. Plan on load development eating a few boxes before you settle.

Recoil and muzzle blast are the second. A 300 grain bullet at 2690 fps out of a 15 pound rifle still moves you, and unbraked .338 Lapua Magnum is genuinely unpleasant to shoot from a bench for long strings. Most people run a muzzle brake, and a brake on this cartridge is loud enough that everyone within thirty yards needs proper hearing protection, not just the shooter. Brakes also throw dust and disturb spotting.

Barrel life is the third. Expect somewhere between 1200 and 2500 rounds of accurate barrel life depending on how hard you run it and how much you let it cool. That sounds bleak until you realise most owners never shoot that much, but if you compete seriously, budget for a rebarrel and treat the count honestly.

Finally, check your twist. This 300 grain Scenar OTM needs a 1-10 twist or faster. A few older .338 Lapua Magnum barrels were cut 1-12 for lighter bullets and will not stabilise it reliably, especially in cold dense air. If you are unsure what your barrel is, find out before you buy a case of ammunition it cannot shoot.

Shooters comparing factory options often look at the 300 grain Hybrid OTM tactical match load or the 300 grain Custom Competition HPBT alongside it. Full factory data is published on the Lapua product page.

Lapua 338 Lapua Mag 300gr Scenar suits extended range competitors, precision rifle students and anyone running an AI AXMC, Barrett MRAD, Savage 110 BA or similar rifle who wants a known reference load. MAG5 Firearms is a family owned FFL in Collegeville, Pennsylvania. Ten round boxes ship where state and local law allows.