Consistancy of IMR 4064

[BsChoy]

I recently posted looking into the number of people who might be using IMR4064 for the 6.5 Swede. I know slower powders have been the way to go for years but this was for S@#t's and giggles. So I have worked up from 36 grains in half grain increments to 39.5...no pressure signs (as a matter of fact I am getting soot swirls on the brass as a sign of low pressure?) and velocity around 2555 fps with 140gr hornadys. I was amazed by the single digit SD with this powder compared to the average for RL22. Im talking like a 6 for 4064 compared to 15-20 fps difference for RL22 and accuracy was about even.

For some reason I did not expect the "old warhorse" IMR powder to better the younger, hipper, better coated blah,blah,blah RL22...I If I end up not finding 4064 suitable I am really considering IMR 4350 to try next and see if the numbers are there as well. Any care to toss their 2 cents in the ring and enlighten me as to your experiences if any with this cartridge and/or the use of IMR4350.

Thanks
Chris

 

[USSR]

Chris,

Have used H4350 with 142SMK's. Was able to get up to 2925fps safely with it.

Don

 

[BsChoy]

That is very good to hear Don, what length barrel? Im shooting a milsurp M38 with the 23 incher.

 

[Slamfire]

I've got some ten year old data where I loaded the 6.5 Swede. When I look at my reference data, in a 24" Cavalry carbine 143 grain Swedish ball gave me about 2500 fps.

43.0 grains of IMR 4350 with a .263 140 Speer gave me 2611 fps without any noted pressure signs. I think this cartridge will work best with slower powders like 4350, but if you are getting excellent accuracy with 4064, why fix what aint' broke?

 

[USSR]

That's with 46.0gr of H4350 in Lapua brass fired in a 28" Obermeyer.

Don