Modern Sporting Rifle Evolution
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Dwb

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Reply with quote  #76 
I have good supply of a2460 and a2015 have used a lot of a-2230 and a-2460 in 223 they are pretty close together in the 223 case ,2460 just takes about a half to one grain more and fills the case a little more then a-2230 both are very good powders in the 556-223.
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jwtharpe

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Reply with quote  #77 
Quote:
Originally Posted by Talenel
Any numbers from shorter barrels yet?  I'd like to see what the 80 gr federal psp or 85 gr Speer btsp do out of an 18-20"


We have some shorter barrels on order. They have not come in yet. I will have to chamber them and make resize dies before sending them out. Hunting season coming up soon too. 
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Dwb

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Reply with quote  #78 
Quote:
Originally Posted by jwtharpe
Quote:
Originally Posted by Talenel
Any numbers from shorter barrels yet?  I'd like to see what the 80 gr federal psp or 85 gr Speer btsp do out of an 18-20"

We have some shorter barrels on order. They have not come in yet. I will have to chamber them and make resize dies before sending them out. Hunting season coming up soon too. 
If every thing goes good when do y'all think the barrels will be available for someone to buy one?
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jwtharpe

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Reply with quote  #79 
Quote:
Originally Posted by Dwb
 If every thing goes good when do y'all think the barrels will be available for someone to buy one?


Once we get the first ones out and shooting, I will hand the final reamer print off to Mark. I am using two reamers on it right now. one does the body, neck and short leade, the second is just a throater to set free bore length. Need to get the opinions of some other shooters before we can call it done. 
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talonxracer

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Reply with quote  #80 
I have been checking out as many 6mm TCU and 6x45 re-loading links that I could find to see what powders were used, it is a very interesting spread of powders, many appear to work fairly well. I really want to see what it will do with the 62gr varmint grenade as well as the 80gr TTSX and 95gr SST. I would bring a mag of the VG's along while deer hunting, the yotes don't deserve the TTSX's , LOL
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helix6

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Reply with quote  #81 
JWTharpe, I'm not really looking at this cartridge for exclusively launching 105 gr. A-Max (or anything similar). It would just be nice to be able to do that occasionally, even if only single feed. To shoot 87 gr. V-Max out of the 6x45 it really needs to be single fed to get decent velocity and anything heavier really isn't an option outside of a bolt rifle - in which case I question why not just use .243 Win. I just assume based on the likely velocity of this cartridge, 1:8" would be an optimal twist rate for lobbing some heavies on occasion and reliably spinning the mid-weight 6mm bullets. Am I wrong that if a guy really just wanted to shoot 60-75 grain 6mm bullets (on the AR-15 platform) they would be just as well served by shooting 6x45 with a more widely adopted cartridge? Like you said, the real weakness of 6x45 becomes apparent when you cross the 85 grain threshold and just can't maintain any semblance of magazine length. With something like the 100 gr. Speer leaving the muzzle around 2400-2500 fps (assuming a 20" barrel) 1:9" would appear to be the minimum twist. That combo seems to have a lot of potential as a short range blacktail cartridge (for us left coasters).

Benchmark seems to be a proven performer in 6x45 (at least in my testing) - does that powder have potential to crossover well into this case design as well? I think for higher BC bullets and shooting more distance, the 6.5 PCC has just a little more potential just given the nature of the projectiles available. I'm not looking for a long range rifle exclusively, although with certain combos, this likely has the potential to get out to 700 yards+ and ring steel.
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jwtharpe

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Reply with quote  #82 
Helix, we are on the same page. I was not trying to promote it as something that its not.  Benchmark will be a good temp stable powder for it. I dont think it will give the best velocity due to its density, but should be very clean and accurate.

Load data for the mongoose will closely mirror 6x45 data. they both have nearly the same capacity.  Whatever you find for the 6x45 is pretty much what it will do in the mongoose.

The 100gr. speer should run around 2650 from a 20" barrel. 105's and 107's ran 2800 from a 26" BC=.525 will reach way out there. 
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jwtharpe

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Reply with quote  #83 
Ranger Joe sent some Federal 80PSP's. If you're anal about numbers these are not for you. The distance to the lands varied .070" on the ten bullets that I sampled. I checked them with a Stoney Point comparator (same as Hornady). They will be great for plinkers, plates, and blasting, but I would not use them for hunting because of the variances. Because of this I was forced to load them short in order to keep them from causing problems. The crimp groove ended up being just inside the case, and is of no use. 8208 gave the best accuracy with them shooting them right around an inch with the 28.0gr. charge.  Still shooting the same 50 cases that I started with, they have around 6 cycles on them. Lost probably 6 or 8 due to loose primer pockets. 

 
Case- LC96
Primer- 450
Bullet- Fed. 80PSP pulled
Trim- 1.690"
Powder- 2460, 8208
Barrel- 26" 4G,8T
OAL- 2.185" 

2460
27.0gr.
1-3037-av-3020
2-3030-es-41
3-2996-sd-13
4-3009
5-3030

28.0gr
1-3065-av-3086
2-3079-es-43
3-3108-sd-17
4-3100
5-3079

8208
27.0gr.
1-2976-av-2982
2-2976-es-40
3-2969-sd-15
4-3009
5-2982

28.0gr.
1-3122-av-3128
2-3108-es-36
3-3144-sd-15
4-3122
5-3144

20150913_174358-1[1].jpg 

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Talenel

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Reply with quote  #84 
3128 average on the last string.  Hmm what would a 20 " do?
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jwtharpe

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Reply with quote  #85 
Quote:
Originally Posted by Talenel
3128 average on the last string.  Hmm what would a 20 " do?

I would estimate around 2900 or 2950. Wont know for sure until a couple of weeks. 335 and exterminator will get them to 3200 or better from the 26.
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MDWS

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Reply with quote  #86 
20150915_213937-1-1.jpg 

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helix6

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Reply with quote  #87 
Yes please! I notice you seem to be trying multiple twist rates - 10 and 8 it looks like. I'm really excited for this cartridge.
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jwtharpe

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Reply with quote  #88 
20" 8 twist chambered today. goes bang friday. 

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MDWS

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Reply with quote  #89 
Quote:
Originally Posted by jwtharpe
20" 8 twist chambered today. goes bang friday. 



Gitty-up!

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jwtharpe

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Reply with quote  #90 
New 20" barrel. This chamber is .010" shorter than the 26" barrel. I think I will leave it alone now.  

Case- Lapua
Primer- 450
Bullet- 90 Sierra FMJ 
Trim- 1.680"
Powder- BL-C(2)
Barrel- 20" 4 groove 8 twist
OAL- 2.265"

27.0gr.
1-2699-av-2685
2-2688-es-54
3-2650-sd-24

27.5gr. These three went into .4" group
1-2772-av-2775
2-2766-es-23
3-2789-sd-11

28.0gr
1-2777-av-2796
2-2789-es-35
3-2807-sd-14
4-2812
5-2795

28.5gr.
1-2830-av-2824
2-2830-es-18
3-2812-sd-10

Case- Lapua
Primer- 450
Bullet- 70 Nosler Varmageddon
Trim- 1.680"
Powder- 335
Barrel- 20" 4 groove 8 twist
OAL- 2.270"

29.0gr.  Not very accurate, warm load
1-3267-av-3293
2-3300-es-66
3-3333-sd-25
4-3276
5-3292
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talonxracer

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Reply with quote  #91 
Nice performance from the 20"
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MDWS

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Reply with quote  #92 
And what's the BC on that 90 grain bullet going 2800?!
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We are charged with upholding the constitution, from all threats, foreign or domestic, and we will bear true faith and allegiance to the same.


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jwtharpe

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Reply with quote  #93 
Quote:
Originally Posted by MDWS
And what's the BC on that 90 grain bullet going 2800?!


0.24390.218.387 @ 2800 fps and above
.376 between 2800 and 2100 fps
.368 @ 2100 fps and below

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MDWS

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Reply with quote  #94 
Quote:
Originally Posted by jwtharpe
Quote:
Originally Posted by MDWS
And what's the BC on that 90 grain bullet going 2800?!


0.24390.218.387 @ 2800 fps and above
.376 between 2800 and 2100 fps
.368 @ 2100 fps and below



Giggity.  And that's just the FMJ.  Nice.

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talonxracer

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Reply with quote  #95 
Waiting isnt easy! Chomping at the bit.....LOL
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RangerJoe

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Reply with quote  #96 
I do like those 90gr FMJ-BTs. Could never get the MV I expected/wanted with them in my 22" 6x45... but this round is a goose of a different feather!
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jwtharpe

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Reply with quote  #97 
Quote:
Originally Posted by RangerJoe
I do like those 90gr FMJ-BTs. Could never get the MV I expected/wanted with them in my 22" 6x45... but this round is a goose of a different feather!

What was your load data for them RJ? Might try to replicate in this barrel.
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RangerJoe

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Reply with quote  #98 
JW - I'll see if I can find my data book from the 1980s; most likely was with IMR4198 since cool stuff like A-1680 wasn't available then.  You know how many times Uncle Sam has moved me since then??  LOL... I still have boxes I haven't unpacked from my last TWO (or three...) moves.  Yes - I'm a pack-rat, born to depression era pack-rats.  [rolleyes]
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RangerJoe

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Reply with quote  #99 
JW - oldest data I could find was from May 1995, last time I pulled the trigger on my 6x45.  I tested two loads with the 90gr FMJ-BT, 25.5 & 26.0gr WW748, Rem 7-1/2 primer, loaded to 2.260" OAL.  My notes say 26.0 was "max" - but no data as to why.  I don't recall if that was all I could fit in the case, or if I had pressure issues, or ....
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helix6

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Reply with quote  #100 
That is pretty nice performance and a lot better than I'm getting out of my 20" BHW 6x45 with 87 gr. V-Max. I'm averaging about 2650 with the 6x45 and that bullet due to backing the load off for seating depth.
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