Home Forums Hunting & Shooting Predators and Varmints IMR 4166

Dose anyone have any experience with this powder? Since I live in the Peoples Republic of California its lead free time. I'm not looking for data as it is for a 243 Win w 62gr VG , 55gr BTLF and Barnes 85gr Tsx. Hodgdon has the load data. for the gun and the 3 bullets. I am mainly looking for things like consistence. Is it consistent from starting load to max? Dose it have to be run heavy to be consistent . Dose it prefer standard or mag primers? If you have used it with Hodgon load data how close were the fps to to the data? Is it dirty? If so was it on the low end ? high end? or with all loads.? If you used a cromo was extreme spread smaller as the load was increased? Did the extreme spread go up as you got near the max load? Thanks, any thing would help PS start low and work up

When the Enduron powders were introduced, Hodgdon had me do an article for their 2015 ANNUAL MANUAL on IMR4166. After looking at their data, I tried it in nine rifles chambered for the .204 Ruger, .223 Rem/5.56 NATO, .243 Win., 257 Roberts, .30-06, .303 British, 8x57 Mauser and .45-70.

Despite some of Hodgdon's data being low-pressured for the older rounds (especially the .303, 8x57 and .45-70) results were very good across the board. In fact, it acted very much like either of the 4895s--but with a decoppering agent, which worked very well.

It burned cleanly at all pressures, though there were a few unburned kernels in the .45-70 loads, which were "trapdoor" level, and in fact tested in an H&R reproduction Officer's Model carbine.

I did not notice any tendency for it to work better at maximum pressures, and also did some tests with both hot and cold temperatures, since all the Endurons are advertised as temp-resistant. It passed those as well.

Thanks MD. I'm just getting started with long term trials with IMR 4166 and IMR 4451. Nice to know you've done a much better, more extensive job of testing them for us. E