6mm Rem and H322?

[Linefinder]

I've always fired Varget in my 6mm Rem pdog rig with 75 grain VMaxes. But, having recently purchased QuickLoad, I've been playing around with various "what-ifs".

The numbers for this chambering and 75 VMaxes combined with H322 surely look interesting...but, I've never heard of, nor read, any loading manuals that even mention H322 & 6mm Rem on the same page.

I figure I must be missing something important. OTOH, maybe I accidently stumbled upon something good.

Anyway, I figured I'd better ask the pros.

Thanks,

Mike

 

[thane]

I would be carefull using h322 in that large case.
How much h322 are you put in? How full is the case?
In my opinion that powder is way too fast of a burning
rate for a 6mm rem.
In my .243 win with same bullets, I had good luck with
rel. 15.
Thane

 

[steveyrock]

I am no "PRO" but did experiment a bit with case capacity near to the 6mm Remington.
seems like there would be alot of air space when you reach max pressure in the 6mm Remington case using the faster H-322 verses Varget.I did some experimentation with faster powders in a 243 Ackley improved years ago.Load density becomes an issue and will show up with wild readings on a chronograph.The fastest powder I could use was IMR-4064 with an 80 GR bullet and a 10 twist barrel. That combination shot very well and gave very consistant readings on the chrono with a low ES/SD.

 

[Linefinder]

The loads I was firing with Varget were decidedly conservative at 37.5 grains which is a loading density of 78%, and I never observed any problems. If the numbers QuickLoad is producing are correct, I could get an 84% loading density with H322 while maintaining a cushion below max SAAMI pressures.

Mike

 

[steveyrock]

Mike
I pretty much stay with published data as far as burn rates for a given case capacity.I may go over charge weights that are published if the gun tolerates it and there are no pressure signs but I would not put that much 322 in the 6mm Remington and put my head behind the scope to touch one off with out proven published data.Please be carefull.

 

[Linefinder]

Yeah, good advice. Once again, just playing "what-ifs" with QuickLoad, I pushed the numbers for both up to "Max". Turns out there isn't 35 fps difference in the two, so nothing to be gained by attempting the change. FWIW, I've always got my best accuracy well under reloading manual max loads.

The only reason I was even thinking this combination is simply because H322 meters so much better than Varget, even through a BR-3 measure. And in p'dog quantity of rounds, this is a consideration.

But, I guess if none of the published manuals list a load in this chambering for H322, it's probably for good reason.

Thanks for the observations!

Mike

 

[expiper]

I have used 36 gr of 322 with a 75 gr Sierra ....good results...Roger

 

[Preacher]

I sure wouldn't worry about using it in a big case, I burn up a lot of H-322 in cases a lot bigger than the 6mm, my 375 JDJ barrel likes 51 grains of it with a 220 grain Hornady, and it even is good in my 458 WM with the 500 grainer......

 

[thane]

Preacher
OK, I see your point. I guess what I was trying to say was
large case size with small caliber size where the bottle-neck
ratio is more severe.

Thane

 

[thane]

Preacher
OK, I see your point. I guess what I was trying to say was
large case size with small caliber size where the bottle-neck
ratio is more severe.

Thane

 

[AckleymanII]

Linefinder, it is probably a really bad choice to use 322 in the 6mm Rem for several reasons. You will max out the pressure at a much lower velocity compared to some slower powders.

If you are going to use a big cartride like the 6mm Rem, you should want to have some velocity to help on those days when the wind is up in the 15mph range+.

I have shot the barrels out of many custom and factory varmint 6 Rem's shooting Win 760,meters like water) and H4895.

I developed the loads in S. Ca. then traveled to S.D. where it was 25*+ warmer and never got into trouble with my loads being too hot. I did have sense enough to keep my ammo out of the sun.

Win 760 and IMR 4064 will give you unreal accuracy and very fast velocities with Win cases and Fed 210 primers.

Scratch the 322 in a 6 Rem, that is using the back side of your Ax to cut down your tree!

 

[USAPatriot]

If you're looking for metering, how will H380 stack up in QL's figures? It's also a very fine powder and while I haven't yet tried it in my own 6BR I'll get to it eventually. -Rod-