Product Overview
IMR 4227 is a medium burn speed, magnum pistol propellant. If a pistol says Magnum, IMR 4227 is the choice for true magnum velocities and performance.
In rifles, this powder delivers excellent velocity and accuracy in such cartridges as the 22 Hornet and 221 Fireball.
IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data.
Available in 1-LB and 8-LB containers.
Reviews
21 Reviews
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5 22 hornet
Posted by Elton Wood on Jan 20th 2023
This is my go to for 22 hornet
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5 .300 AAC Blackout
Posted by Tom on Jan 1st 2023
Very consistent performance through my .300. Feeds well through my powder measure. Next up are some .44 Remington Magnum.
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5 17 Fireball or 17 MachIV
Posted by Larry Howell on Dec 2nd 2022
Dime size 5 shot groups at 100 yards 16 gr 4227 IMR, Sako L461, 1960's vintage, 17 Mach IV. I see similar performance with Bull bbl Thompson break over on Birds eye maple thumb hole stock.
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5 imr 4227
Posted by Richard Ryan on Aug 8th 2022
love it. use it in a number of rounds
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2 Loading data not listing calibers that were used iin several world wars
Posted by Rick Simopnson on Jun 11th 2022
Not listing the .303 British rifle caliber for powders that are commonly used is a real disappointment. .303 British caliber with lead bullets like the Lyman 200 grain that is very popular and it is a wonder why it is not listed but something 6.5 Creedmore is. How many British .303 rifles are in the hands of shooters the world over compared to the 6.5 calibers?
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5 Imr4227 powder
Posted by Bob on Feb 26th 2022
I have used 4227 since 1969 in both rifles and big bore pistols
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4 Power
Posted by Bob on Dec 11th 2021
Shoot good
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5 4227 and 454 Casull
Posted by A. G. Pitts on Nov 21st 2021
Trying to get consistent loading info for 454 Casull can be frustrating, but it is out there. Using 4227 with 300gr cast bullets in a RIFLE. (Loading tables are all for pistols) But I am getting 1300 fps and 3" groups @100yds with hopes to make it tighter next spring. 4227 leaves a lot of unburned powder in a rifle barrel. I hope someone comes out with 454 rifle data soon.
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5 Excellent powder!
Posted by Jeremy R on Nov 18th 2021
The powder arrived very quickly and well packaged. I use this for .357 loads. I load 125gr JHP, which makes for some real hotsteppers. The powder arrived very quickly!
