IMR is one of the oldest smokeless powder brands and has considerable historical significance as a supplier of propellants to both the US and Allied militaries during both world wars, producing about 2.5 billion pounds of powder during WWII.
During the war, IMR established a plant in Valleyfield, Canada; this plant is now owned by General Dynamics and continues to produce propellants. Hodgdon is the US distributor for IMR powders.
The name IMR stands for "Improved Military Rifle." You'll find their full line of powders in-stock and for sale below with fast shipping.
IMR Powder - White Hot 50 Cal - 72 Pack$19.00
Manufacturer IMR Manufacturer SKU WHP50 Powder Type Muzzleloader Powder Weight 72 Pack
IMR .50 caliber "White Hots" are a premium substitute for black powder which feature a clean burn with little residue or odor, compatibility with any breech type or standard 209 primer, dependable ignition and consistent performance in any temperature, and flat accurate shots at up to 2,300 feet-per-second. Each of the 72 pre-formed pellets weigh 50 grains, are easy to handle and carry , and will effortlessly slide down the barrel. In addition "White Hots" come packaged six to a tube (12 tubes total) for convenient storage and weather resistance and cleaned up after with a single wet water patch.
IMR Powder - 4320 - 1 lb$24.00
Manufacturer IMR Manufacturer SKU 943201 Powder Type Rifle Powder Weight 1 lb
IMR 4320 is a short-cut grain powder with a slow burn rate intended for high capacity rifle cartridges. The smaller grains of this powder make metering a breeze and allow for consistent accuracy and performance shot-to-shot. IMR 4320 propellant can support a wide range of popular rifle calibers including, but not limited to, .223 and .22-250 Remington, .270 Swift, .250 and .300 Savage, and .30-06 Springfield.
Our generous powder selection is complimented by a wealth of projectiles and other components so that you can complete your shopping all in one place.
very helpful and self explanatory. I appreciate this very much
Please keep up the good info for the shooter and re-loader. hk
Review by rev. (Posted on 6/17/16)
IMR Powder - 4451 - 1 lb$24.00
Manufacturer IMR Manufacturer SKU 944511 Powder Type Rifle Powder Weight 1 lb
IMR 4451 is a extruded rifle powder which performs well with rifle cartridges that burn at a medium speed. As part of the Enduron line, IMR 4451 features smaller granules for easier loading and more accurate measurement, precisely calculated density, and a special blend of ingredients which greatly reduces copper fouling while presenting no danger to the environment. This propellant serves many popular caliber choices including, but not limited to, .30-06, .270 Winchester, and .300 WSM.
You can also turn to Widener's for other reloading components like primers for a more complete and convenient order.
IMR Powder - 7828 - 1 lb$24.50
Manufacturer IMR Manufacturer SKU 978281 Powder Type Rifle Powder Weight 1 lb
IMR 7828 is THE premier powder for loading big bore magnum rifle rounds for sporting and hunting use. With a slow burn rate, high energy, and great dependability, the reputable IMR 7828 propellant is ideal for heavy loads in calibers like 7mm Remington Ultra Mag, .300 Winchester Magnum, .243 Winchester, and countless others.
Here at Widener's we make it a point to carry other necessary components such as bullets to compliment your powder order so you can spend less time browsing and get back to loading and shooting!
IMR Powder - 4831 - 8 lbs$157.00
Manufacturer IMR Manufacturer SKU 948318 Powder Type Rifle Powder Weight 8 lbs
IMR 4831 is a great choice for loading a wide range of rifle calibers including medium-sized magnums. 4831 propellant is known to the most experienced reloaders to provide unbelievable accuracy and top velocity to heavy projectiles especially in .270 Weatherby Magnum cartridges. Other calibers that pair well include .300 Winchester Magnum, 7mm RUM, and .243 WSSM.
IMR Powder - 7828 - 8 lbs$161.00
Manufacturer IMR Manufacturer SKU 978288 Powder Type Rifle Powder Weight 8 lbs
IMR 7828 has a slow burn rate which produces a high amount of energy perfect for heavy rifle loads and especially for large bore magnum rounds. Many experienced reloaders know IMR 7828 for its economical price and ability to throw heavy projectiles downrange with ferocious velocity and accuracy worthy of applause. Some of the calibers this propellant is suited for include .30-378 Weatherby Magnum, .300 Winchester Short Magnum, and even medium calibers like .243 and .270 Winchester loaded with heavy bullets.
Whether you're starting a new load workup or already have the perfect recipe bought and paid for, Widener's stocks some of the top brands of bullets and primers in order to get you the components you need in the most convenient package.
IMR Powder - 7828 SSC - 8 lbs$161.00
Manufacturer IMR Manufacturer SKU 978288S Powder Type Rifle Powder Weight 8 lbs
IMR 7828 SSC gives you the same magnum performance as the original version but with short grain kernels which mirror the advantages of spherical grain rifle powders; more accurate and consistent metering, increased maximum charge and velocity, and easier flow through equipment and case necks. With a burn rate identical to the original 7828, IMR 7828 SSC propellant is well suited for calibers like .300 Remington Ultra Mag, .300 Winchester Magnum, and many other big bore choices.
IMR Powder - 4320 - 8 lbs$162.00
Manufacturer IMR Manufacturer SKU 943208 Powder Type Rifle Powder Weight 8 lbs
As an evolution of a powder used to load pre-WWII .30-06 cartridges, IMR 4320 is a well refined propellant which can serve a wide spectrum of modern sporting calibers. IMR 4320 powder consists of short cut granules with properly proportioned density and a slow burn rate which is intended to perform well loaded in large capacity casings. The small grains easily load skinny case necks for .223 Remington and .220 Swift but still provide enough energy for heavier loads in .270 Winchester and .300 Savage.
We at Widener's believe in the value of your time and money so we stock a healthy selection of primers alongside our powder so that you can save on HAZMAT fees and get back to loading that much sooner.
I shoot 45 grains of IMR 4320 under a 168 gr SMK HPBT and I am getting groups that look like the ace of clubs. This is from a Remington 700 SPS Tactical 20" factory barrel in a Choate stock
Review by Mike (Posted on 4/21/16)
Excellent for 308
The 4320 has worked very well for my 308 loads - clean, and accurate. I like 45 grains behind a 150 gr fmj round.
Review by Jim (Posted on 1/16/16)
IMR Powder - 4227 - 8 lbs$163.00
Manufacturer IMR Manufacturer SKU 942278 Powder Type Handgun, Rifle Powder Weight 8 lbs
IMR 4227 is suitable for small game rifle cartridges as well as for magnum pistol calibers like .357 Magnum and .44 Remington Magnum. This propellant is noted for its excellent velocity and accuracy in smallbore rounds like .204 Ruger and .22 Hornet as well as short lever-action cartridges like .32-20 Winchester.
Get the most from your Widener's order when you add in primers and other components for cost efficiency under a single HAZMAT surcharge.
Super versatile powder, clean burning and works well in 221FB, 222 Rem, 223
Review by Jeffrey (Posted on 3/31/16)
IMR Powder - 4166 - 8 lbs$190.50
Manufacturer IMR Manufacturer SKU 941668 Powder Type Rifle Powder Weight 8 lbs
IMR Enduron powders like the versatile 4166 represent over 200 years of innovation in the chemical explosives industry and thus are cleaner burning with minimal copper fouling, perform consistently no matter the ambient temperature, and are composed of ingredients which are all harmless to the environment. IMR 4166 is a fast-burning, extruded rifle propellant which reloaders will enjoy for its match-grade performance in .223 Remington, .308 Winchester and .30-30 Winchester, .257 Roberts, and many more.
IMR Powder - 4451 - 8 lbs$195.00
Manufacturer IMR Manufacturer SKU 944518 Powder Type Rifle Powder Weight 8 lbs
Almost every handloading rifle shooter will find a use for the extremely versatile and precise IMR 4451! IMR 4451 is an Enduron propellant which resists shift in velocity caused by extreme temperatures, leaves minimal copper fouling and residue, is completely environmentally safe, and uses a small grain size for easy processing and accurate metering. This powder is suitable for use with some of the most popular rifle loads requiring a medium burn rate such as .270 Winchester, 6.5mm Creedmoor, .416 Rigby, and many more.
Be sure to add primers and other components to your Widener's order to save on shipping and HAZMAT while you get supplied for a precision load workup.