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talonxracer

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Reply with quote  #51 
 How many Mongoose's(or is it Mongeese, LOL) did you get in the P-mag?
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Dr69er

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Reply with quote  #52 
JWTHARPE, if you need a HK-416 Marine Magazine (2.305" COL) for your testing
give me a buzz...What twist are you using BTW for the Mongoose ?

I had suggested to BHW to build their 6mm rifle blanks with a 1:8 twists but alas
it fell on deaf ears...1:9 twist rates won't always stabilize the longer and heavier
6mm pills...

6mm caliber barrels seem to be extra sensitive to twist rates and bore quality, I
have used AR's in 6x45 and 6mm TCU and have found this to be true...H335 was
the preferred powder for 75gr and higher weight loads in my 6mm TCU AR at the
time...

Anyway, it seems you are getting great results so far...best of luck and continued
success .

Thanks,
Vic
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MDWS

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Reply with quote  #53 
We have a few getting done in 1:8 twist, and one in 1:10 twist special request as that user will only be using the lighter fare.

The "round 2" test barrels will be here in a few weeks I hope.

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Dr69er

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Reply with quote  #54 
Excellent choice on getting then in a 1:8 twist Mark.
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RangerJoe

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Reply with quote  #55 
Quote:
Originally Posted by MDWS
... and one in 1:10 twist special request as that user will only be using the lighter fare
A "low cal diet" - so to speak? [wink]

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MDWS

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Reply with quote  #56 
Quote:
Originally Posted by Dr69er
Excellent choice on getting then in a 1:8 twist Mark.


This one is the brainchild of my partner jwtharpe... I take no credit ha.

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MDWS

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Reply with quote  #57 
Quote:
Originally Posted by RangerJoe
Quote:
Originally Posted by MDWS
... and one in 1:10 twist special request as that user will only be using the lighter fare
A "low cal diet" - so to speak? [wink]


I guess! Hopefully they get here soon, I'm itching pretty good after having spent a few hours at the bench last night.

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JBFA

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Reply with quote  #58 
Quote:
Originally Posted by MDWS
Quote:
Originally Posted by RangerJoe
Quote:
Originally Posted by MDWS
... and one in 1:10 twist special request as that user will only be using the lighter fare
A "low cal diet" - so to speak? [wink]


I guess! Hopefully they get here soon, I'm itching pretty good after having spent a few hours at the bench last night.


They have ointment for that Mark

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jwtharpe

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Reply with quote  #59 
Quote:
Originally Posted by JBFA
Quote:
Originally Posted by MDWS
Quote:
Originally Posted by RangerJoe
Quote:
Originally Posted by MDWS
... and one in 1:10 twist special request as that user will only be using the lighter fare
A "low cal diet" - so to speak? [wink]
I guess! Hopefully they get here soon, I'm itching pretty good after having spent a few hours at the bench last night.
They have ointment for that Mark

Mongoose piss will cure it!
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jwtharpe

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Reply with quote  #60 


Vic, thanks for the comments and offer on the mag. I have a couple with the fronts cut out for the long range bullets. It's crazy accurate with 107 Noslers loaded long. The 8T let's you shoot whatever you want, the lightweights might not be quite as accurate as the heavies though.
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helix6

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Reply with quote  #61 
I'm glad you guys are pursuing 1:8" twist. That should be the most versatile option and most guys that are wanting this cartridge are in the same boat I'm in - they would shoot 6x45 but it just can't run heavy bullets effectively on the AR platform. If you just want to shoot 75s, might as well stick with the more prevalent 6x45.

I assume that the 20" barrel will wind up using rifle gas and maybe mid-length on shorter barrels?
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Dwb

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Reply with quote  #62 
I need another upper like I need another butt hole But I'm wanting to see how this 6mm cat turns out sure would like to have one for Christmas.
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RangerJoe

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Reply with quote  #63 
Quote:
Originally Posted by helix6
I'm glad you guys are pursuing 1:8" twist. That should be the most versatile option and most guys that are wanting this cartridge are in the same boat I'm in - they would shoot 6x45 but it just can't run heavy bullets effectively on the AR platform. If you just want to shoot 75s, might as well stick with the more prevalent 6x45.

I built my first 6x45 in 1982 (-/+), it was still very much a wildcat then. It has never been able to provide optimal velocities with even medium weight (80~90 gr) bullets; they simply consume too much case capacity. A 70gr Nosler VG (FB) seated to mag length sits below the case/neck junction; the 80gr Nosler BT boat-tail is worse.  I'm excited to see what the Mongoose can do, and am happy that several twist rates are being explored to see what works well with a wide range of bullets to meet a wide range of shooters' requirements.

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jwtharpe

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Reply with quote  #64 
Quote:
Originally Posted by helix6
I'm glad you guys are pursuing 1:8" twist. That should be the most versatile option and most guys that are wanting this cartridge are in the same boat I'm in - they would shoot 6x45 but it just can't run heavy bullets effectively on the AR platform. If you just want to shoot 75s, might as well stick with the more prevalent 6x45.

I assume that the 20" barrel will wind up using rifle gas and maybe mid-length on shorter barrels?

Helix, I think you might be misunderstanding the purpose for this cartridge. Its not for shooting long range match bullets from an AR mag. A totally different chamber would have to be designed to work at mag length. The case would need to be somewhere around .100" shorter depending on bullet in order to make them fit. As you know, that would give up a lot of capacity, and would give up a good bit of velocity for the shorter bullets. A 9T or 10T will work best with these projectiles. I chose to use a 8T because I sometimes like to shoot long range match bullets( not from a regular AR mag ), and a 9T wont stabilize the heaviest ones.

  It is for shooting everything up to and including bullets designed to take medium sized game. this includes all of Noslers ballistic tips and accubonds, Barnes 80TTSX, 85TSX, Hornadys SST, interbonds, Sierra pro hunters, game kings, all of speer's bullets etc. etc. etc  any of the short to mid range benchrest bullets.


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jwtharpe

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Reply with quote  #65 
RangerJoe sent some 90 Sierra FMJ's to try out. These are nice! The rifle is overgassed with all of the powders I tried today. I will make a smaller gas tap for it sometime this week. Still feeds and cycles like a champ, just banging the buffer tube pretty hard.


Case- LC96
Primer- 450
Bullet- 90 Sierra FMJ
Trim- 1.690"
Powder- various
Barrel- 26" 4G,8T
OAL-various

AR-Comp OAL-2.275"
25.5gr. Group-1"
1-2861-av-2856
2-2867-es-25
3-2842-sd-13

TAC OAL-2.275"
28.5gr. Group-1.3"
1-3003-av-2982
2-2969-es-34
3-2976-sd-17

This was a surprise, was thinking 2460 would be to slow

A2460 OAL-2.285" Case full
28.0gr. Group-.6"
1-3051-av-3032
2-3023-es-23
4-3023-sd-16


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RangerJoe

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Reply with quote  #66 
Oh YEA - 3k+ with 90gr and sub-MOA from first test.  If 2460 worked well, X-Term, TAC, and WW748 are potential candidates to try too.  NICE!!  [love] [thumb]
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RangerJoe

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Reply with quote  #67 
JW - the 80gr Federal PSPs should be there Tuesday if they didn't make it on Saturday.
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jwtharpe

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Reply with quote  #68 
Quote:
Originally Posted by RangerJoe
Oh YEA - 3k+ with 90gr and sub-MOA from first test.  If 2460 worked well, X-Term, TAC, and WW748 are potential candidates to try too.  NICE!!  [love] [thumb]

I tried TAC, it wasn't accurate at this load length. BLC-2 and 335 should work too. Was trying some temp stable powders, the ones I tried were slow. Gonna try some 332 and benchmark and see how it does
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talonxracer

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Reply with quote  #69 
Would some AA2015 be worth grabbing for this round?
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jwtharpe

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Reply with quote  #70 
Quote:
Originally Posted by talonxracer
Would some AA2015 be worth grabbing for this round?

Yep, that's a good one. Density not optimal, but rate is good.
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coondog

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Reply with quote  #71 
Quote:
Originally Posted by jwtharpe
RangerJoe sent some 90 Sierra FMJ's to try out. These are nice! The rifle is overgassed with all of the powders I tried today. I will make a smaller gas tap for it sometime this week. Still feeds and cycles like a champ, just banging the buffer tube pretty hard.


Case- LC96
Primer- 450
Bullet- 90 Sierra FMJ
Trim- 1.690"
Powder- various
Barrel- 26" 4G,8T
OAL-various

AR-Comp OAL-2.275"
25.5gr. Group-1"
1-2861-av-2856
2-2867-es-25
3-2842-sd-13

TAC OAL-2.275"
28.5gr. Group-1.3"
1-3003-av-2982
2-2969-es-34
3-2976-sd-17

This was a surprise, was thinking 2460 would be to slow

A2460 OAL-2.285" Case full
28.0gr. Group-.6"
1-3051-av-3032
2-3023-es-23
4-3023-sd-16


Yes! I tried 2460 in my 556X42 and was pleasantly surprised. So much so I picked up 8lbs at PV. Good stuff.
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RangerJoe

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Reply with quote  #72 
Quote:
Originally Posted by jwtharpe
Quote:
Originally Posted by talonxracer
Would some AA2015 be worth grabbing for this round?
Yep, that's a good one. Density not optimal, but rate is good.
Don't know if they still make it, but some years ago Accurate (pre-Western Powders) sold 2015-SC. I still have ~4 lbs of it... will try that too.

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coondog

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Reply with quote  #73 
Quote:
Originally Posted by RangerJoe
Quote:
Originally Posted by jwtharpe
Quote:
Originally Posted by talonxracer
Would some AA2015 be worth grabbing for this round?
Yep, that's a good one. Density not optimal, but rate is good.
Don't know if they still make it, but some years ago Accurate (pre-Western Powders) sold 2015-SC. I still have ~4 lbs of it... will try that too.


The newer 2015 I have looks just like 322 but smaller in dia and darker in color. Meters real well. It's not a long extruded type powder. 2460 is a very unique looking powder. Small round balls that are black, very different looking than you traditional ball type powder. This powder meters good also.
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jwtharpe

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Reply with quote  #74 
Quote:
Originally Posted by coondog
Quote:
Originally Posted by RangerJoe
Quote:
Originally Posted by jwtharpe
Quote:
Originally Posted by talonxracer
Would some AA2015 be worth grabbing for this round?
Yep, that's a good one. Density not optimal, but rate is good.
Don't know if they still make it, but some years ago Accurate (pre-Western Powders) sold 2015-SC. I still have ~4 lbs of it... will try that too.


The newer 2015 I have looks just like 322 but smaller in dia and darker in color. Meters real well. It's not a long extruded type powder. 2460 is a very unique looking powder. Small round balls that are black, very different looking than you traditional ball type powder. This powder meters good also.

I will add that 2460 is not as dense as TAC or 335. Its supposed to be slower than 2230 but I don't think it is.
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Talenel

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Reply with quote  #75 
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"
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