While we now sell direct-to-consumer on our own websites, we prioritize our shipments to our traditional sales channels to maximize powder availability at sporting goods and gun shop retailers everywhere.
We place limited powder inventory for sale on a regular basis on our website. When we are sold out, we are sold out.
We do not take backorders and our Tech Services team cannot take orders via email or phone.
The max order quantity of any powder SKU is 5 and we will only accept one order, per customer, per calendar month with a maximum weight of 48lbs.
Products purchased on our site are NOT FOR RESALE.
PLEASE NOTE: All orders ship within 10-15 business days. Please refer to our Sales and Shipping Policy for more information.
IMR Enduron 4166 is a versatile, match-grade propellant, with the fastest burn rate in the Enduron line. It is an extruded powder with a perfect burn speed for cartridges like 308 Winchester, 7.62mm NATO, 22-250 Remington or 257 Roberts, among other cartridges.
The main features of the Enduron series are copper fouling eliminator, insensitivity to temperature changes, ideal loading density and being environmentally friendly.
This propellant performs comparably to Hodgdon Varget but charge weights are materially different.
IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data.
Working up a good hunting load with the 4166 Enduron and the Hornaday 150 gr GMX bullets for my 308. First ladder turned out great! Very happy with the results.
01-Dec-2020
Name
Jeremy
Great powder
Great powder
25-Jan-2021
Name
jerry capps
works great in many cartridges with good to great accuracy
when enduron works it is often same hole shooting
22-May-2021
Name
Cunningham
measured well, shot well
will re order
03-Jun-2021
Name
Jim
IMR 4166
Good powder
13-Jun-2021
Name
Gerry
Still a work in progress
It acts a whole lot like Varget, but is much easier to find. When I hit that node It's going to be great. I use in 243 Win and 6.5 CM. They both love it.
26-Jun-2021
Name
Phillip Jackson
.308
This is a great powder for my .308,.
01-Aug-2021
Name
Harper
Imr-4166 in 30-30 win.
Loads case to bottom of bullet, clean burning, very consistent, accurate results with no flyers, flows thru powder measure with a. .1 to .2 gr accuracy. Will purchase more. Thanks
30-Aug-2021
Name
Alexis Perez
First 308 loads
Was looking for an equivalent powder from H4895 when I ran into the 4166. First load.
CL 2.005
OAL 2770 Sierra Case
44gr 4166
5 rounds shot
FPS low 2735 high 2789
My factory sierra high 2576...
Awsome powder in my book.
13-Oct-2021
Name
TY
4166 in my 223
I'm using this in my Tikka CTR 223 under 73 gr Berger BT target bullets. Was able to find a node fairly quickly and with a little seating adjustment, it's shooting .3 moa or better. I'm very happy with this powder.
24-Oct-2021
Name
Paul rosenkranz
Very consistent velocity
Very consistent velocity, quality powder, not so good on powder throw due to it being a stick powder. Other than that , great job, thanks.
09-Nov-2021
Name
Randy
4166 Enduron
Really like this powder, the accuracy it produces is amazing I will lots more if I can find it. Love the copper fouling eliminator makes cleaning a breeze
Working up a good hunting load with the 4166 Enduron and the Hornaday 150 gr GMX bullets for my 308. First ladder turned out great! Very happy with the results.
Great powder
when enduron works it is often same hole shooting
will re order
Good powder
It acts a whole lot like Varget, but is much easier to find. When I hit that node It's going to be great. I use in 243 Win and 6.5 CM. They both love it.
This is a great powder for my .308,.
Loads case to bottom of bullet, clean burning, very consistent, accurate results with no flyers, flows thru powder measure with a. .1 to .2 gr accuracy. Will purchase more. Thanks
Was looking for an equivalent powder from H4895 when I ran into the 4166. First load.
CL 2.005
OAL 2770 Sierra Case
44gr 4166
5 rounds shot
FPS low 2735 high 2789
My factory sierra high 2576...
Awsome powder in my book.
I'm using this in my Tikka CTR 223 under 73 gr Berger BT target bullets. Was able to find a node fairly quickly and with a little seating adjustment, it's shooting .3 moa or better. I'm very happy with this powder.
Very consistent velocity, quality powder, not so good on powder throw due to it being a stick powder. Other than that , great job, thanks.
Really like this powder, the accuracy it produces is amazing I will lots more if I can find it. Love the copper fouling eliminator makes cleaning a breeze