#11
|
|||
|
|||
Quote:
You are on the right track now that you realize that the 20 PPC is an entirely different cartridge and needs much slower powders to run the 40 grain V-Max. I think that you are also suspecting that less dense powders fill the case and burn much faster than denser ball powders, of similar burn rates on the charts, that do not fill the case. Ramshot X-Term and IMR 8208 XBR are good examples of that and running 4000+ with these powders is likely generating pressures well in excess of 65,000 PSI. I say this because RS Tac, which is a ball powder very similar to H 335, and a bit denser and slower burning than X-Term generates 62,900 PSI pushing a 40 V-Max to 3883 fps. AA 2520 is compressed at 29.2 grains and gets 3925 fps at 57,925 PSI. You may be able to run 29.7 grains and safely get4000 fps at about 59,000 PSI if you have enough barrel. See Western Powders load data. http://www.ramshot.com/wp-content/up...2016_Web-1.pdf |
#12
|
|||
|
|||
20 PPC powders
Quote:
Work within those limits, start with start loads and work up very slow, safely and will plenty of due caution and common sense. There is no reason to try and get the most FPS out of cartridge at the risk of being injured, or worse. Bill K |
#13
|
|||
|
|||
Yes, late response I know but QL shows 29-30 grains as max.
|
#14
|
|||
|
|||
Blow up
My ppc blew up due to momentary distraction leading to writing the wrong culver click setting in my journal. The powder was sold as surplus IMR 8208 but there is no way that it is knowing what I now know.
First of all it is longer grained then 8208M and the kernels are cut at an angle like Norma, Vihtavouri or even some Alliant powders. It was a surplus NATO powder sold by Bruno shooters supply in 2010. Very well could be double based. It loads like a slow lot of N133 i.e. 30gr gets 3400 fps +/- in 6MM PPC but it is quite squirrelly in cartridges where max is not at 100% load density. I went on some quick and unexpected pressure excursions with a 20 Tac last year and I'm not going to use it on anything other than 22 Waldog or 6PPC anymore. Anyway I got involved in some different loading projects and a new son so I haven't really revisited the 20 PPC like I was mentioning earlier in this post until last week. Last week I was testing RL15, IMR 4166, IMR 4064, varget, and IMR 4320 for charges that go half way up the neck with a scale. Weights varied between 31-33.5 grs. Good place to back off and work from. Like I mentioned earlier in the thread 33gr of BLC-2 gives 4000 fps. I've had fair results with XBR and IMR4895 but not as consistent as should be expected. I will let you know how it goes. Tuesday after Easter I will be flying out of town for a few weeks to get a job up off the ground so it won't be immediately but soon after I return. I'd be glad to hear from someone else on this 100% load density slower powder business especially real life results. Tim Last edited by ballpowder; 04-11-2017 at 12:35 AM. |
#15
|
|||
|
|||
20ppc
I built a 20PPC in 2004 on a SAKO AI 6PPC single shot
PacNor 24" bbl My pet load is 40gr. Berger w/26.0 N133 @ 3721fps |
#16
|
|||
|
|||
My suggestion when using 8208 is to start at 204ruger quantities and work up.
Somewhere just over 29 grains seems to work well for me.
__________________
Speed Kills |
#17
|
|||
|
|||
20ppc
bump to the top
Last edited by AlbertaAl; 04-19-2017 at 01:54 PM. Reason: bump |
Thread Tools | |
Display Modes | |
|
|