IMR-4350
Handloader|October - November 2020
PROPELLANT PROFILES
Randy Bimson
IMR-4350

Readers of this column may soon discover I have a passion for classics as well as modern technologies. It will come as little surprise then, that this, the first “Propellant Profiles” column I pen, takes a look at one of the all-time classic centerfire rifle propellants.

Purportedly at the time of its introduction, noted authority Phil Sharpe reported that DuPont developed IMR-4350 to optimize the performance of the only “magnum” cartridge of the time, the .300 Holland & Holland Magnum. True or not, with the introduction of IMR4350, cartridges like the then-wildcat .22 Varminter (.22-250) and .25-06, the .270 Winchester and the .300 H&H Magnum, all of which would have been considered overbore capacity at the time, received a much heralded boost in performance from IMR-4350.

In the first “Propellent Profiles” review of IMR-4350 in 1970, John Wootters described it as a “landmark” powder (Handloader No. 27, September-October). IMR-4350 was a game-changer when it was introduced in 1940 and continues, 80 years later, to define the velocity and accuracy potential of many of the latest cartridge designs. IMR-4350 has become the propellant of choice of handloaders who find it a well-balanced powder for a broad selection of the “fat case, small diameter projectile” cartridges that have become, some more, some less, popular in more recent times. These include cartridges like the .22 CHeetah MKI & MKII, 6.5-284 Norma, 6mm and 6.5 Creedmoor, .270 and .300 Winchester Short Magnum, 7mm and .300 Remington Short Action Ultra Magnum and the .300 Ruger Compact Magnum.

Denne historien er fra October - November 2020-utgaven av Handloader.

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Denne historien er fra October - November 2020-utgaven av Handloader.

Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.