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  #11  
Old 08-06-2016, 02:08 AM
20 EXTREME 20 EXTREME is offline
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Quote:
Originally Posted by ballpowder View Post
Ya guys, I can send you some of my loads. Thing is they will be loads I'm thinking of abandoning. I just was looking in my 20ppc load journal. One day 29 gr xterm w/ 40gr vmax I'm shooting good groups with this then later it's terrible. I realize I could have been the problem causing accurate groups also. Velocity 4020fps.

Something I did not mention earlier about being on my second barrel. I blew the gun up with a load of surplus 8208. I'm convinced the so called traditional powders for this wildcat are too fast and not because I had an accident. The appropriate powder can be a full density load and maybe slightly crater a primer not totally blow a gun to hell.

I'm mean think about it. This is a magnum 20 cal like the 17 rem or 22 swift is in their calibers. A guy with a swift wouldn't use the same powders as the guy with a 222 so why do 20 PPC guys seem to use 20 Vartag powders? I don't know why. I'm going to work with powders used in the 17 rem and swift, ie rl15&4320 up to the h380&h414 class. I found data for aa2520 last nite. Good cause I have a 8 pounder of it growing mold. I'll get back to you guys
I really don't think that it was an accident that you blew up your 20 PPC. It was because you really had no concept about what you were doing and the pressures others are actually running with powders used in the 6mmPPC. Powders like LT-32, H 322 and IMR 8208 XBR are used with 66 grain bullets because they give optimal case fill and get 3100-3200 fps at under 59,000 PSI.

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
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  #12  
Old 08-06-2016, 07:17 PM
Bill K Bill K is offline
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Default 20 PPC powders

Quote:
Originally Posted by ballpowder View Post
Ya guys, I can send you some of my loads. Thing is they will be loads I'm thinking of abandoning. I just was looking in my 20ppc load journal. One day 29 gr xterm w/ 40gr vmax I'm shooting good groups with this then later it's terrible. I realize I could have been the problem causing accurate groups also. Velocity 4020fps.

Something I did not mention earlier about being on my second barrel. I blew the gun up with a load of surplus 8208. I'm convinced the so called traditional powders for this wildcat are too fast and not because I had an accident. The appropriate powder can be a full density load and maybe slightly crater a primer not totally blow a gun to hell.

I'm mean think about it. This is a magnum 20 cal like the 17 rem or 22 swift is in their calibers. A guy with a swift wouldn't use the same powders as the guy with a 222 so why do 20 PPC guys seem to use 20 Vartag powders? I don't know why. I'm going to work with powders used in the 17 rem and swift, ie rl15&4320 up to the h380&h414 class. I found data for aa2520 last nite. Good cause I have a 8 pounder of it growing mold. I'll get back to you guys
Ladies and Gentlemen: There is a reason the powder companies test and go to great lengths and post pretty well, there findings on pressure indications and warnings on using or not using certain powders in various cartridges. It is not only for their liability, but for our safety.. If you or I push those limits or ignore them bad things can occur. If only the weapon is damaged, that is enough, but when you or a bystander is, that is very bad.
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
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  #13  
Old 04-05-2017, 08:28 PM
coyotezapper coyotezapper is offline
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Quote:
Originally Posted by P-dog80123 View Post
i want to use 32gr vmax in the 20ppc witth 8208 any suggestions? thanks greg
Yes, late response I know but QL shows 29-30 grains as max.
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  #14  
Old 04-11-2017, 12:32 AM
ballpowder ballpowder is offline
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Default 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.
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  #15  
Old 04-12-2017, 12:44 PM
AlbertaAl AlbertaAl is offline
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Default 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
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  #16  
Old 04-18-2017, 10:23 AM
L461 L461 is offline
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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.
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  #17  
Old 04-19-2017, 01:50 PM
AlbertaAl AlbertaAl is offline
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Default 20ppc

bump to the top

Last edited by AlbertaAl; 04-19-2017 at 01:54 PM. Reason: bump
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