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#2657095 - 03/16/14 10:09 PM Re: 6x45 Load data [Re: WWAYote]
WWAYote Offline
New Member

Registered: 03/02/14
Posts: 6
Loc: WA
Just curious why the limit on max avg pressure of 6x45? Variety of rifles so chambered? Two ARs chambered for 5.56 and 6x45 using identical components except for bullet should be safe at safe pressure levels, right?

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#2657102 - 03/16/14 10:23 PM Re: 6x45 Load data [Re: WWAYote]
midwestpredator Offline
Die Hard Member III

Registered: 03/14/12
Posts: 2721
Loc: nd
Originally Posted By: WWAYote
Strength of the components / barrel / bolt is what I was referring to. A 6x45 AR using 5.56 brass should be just as safe @ 62k psi as a 5.56 AR using 5.56 brass @ 62k psi.

The root of my curiousity came from studying 5.56 load data with max avg pressures around 60k vs. 6x45 data with max avg pressures around 50k. My assumption was 6x45 data was built around acceptable pressure for its"parent" case - .223 rather than its "step parent" case 5.56.



Don't worry about it, there is no difference between the 2 cases. Start low and work up until you find your load or you see pressure signs on the case/primer.

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#2657108 - 03/16/14 10:36 PM Re: 6x45 Load data [Re: pcammo]
midwestpredator Offline
Die Hard Member III

Registered: 03/14/12
Posts: 2721
Loc: nd
Just go up the PM search engine and type in 223 vs 5.56 and read until you are sick of reading.

223 vs 5.56

The link below is a pretty good reference and was pulled from the discussion above

5.56 in a 223 chamber

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#2657233 - 03/17/14 09:21 AM Re: 6x45 Load data [Re: midwestpredator]
eneranch Offline
Seasoned Member

Registered: 06/01/09
Posts: 249
Loc: Colorado Springs, CO USA


Originally Posted By: midwestpredator
Don't worry about it, there is no difference between the 2 cases. Start low and work up until you find your load or you see pressure signs on the case/primer.


^^+1 ; When I see flattened primers & extractor/ejector marks, I know I've reached the top end.

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#2666201 - 04/01/14 04:21 PM Re: 6x45 Load data [Re: eneranch]
eneranch Offline
Seasoned Member

Registered: 06/01/09
Posts: 249
Loc: Colorado Springs, CO USA
For those using IMR8208XBR, are you seeing consistent velocities?

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#2681298 - 05/09/14 06:11 PM Re: 6x45 Load data [Re: pcammo]
Mario A Offline
New Member

Registered: 05/09/14
Posts: 1
Loc: Alaska, USA
I just finished building a 26" Savage 11 in 6x45mm, and IMR has load data for the cartridge online. I was able to work up a 90gr Berger VLD Target over 25.5 grains of 8208 XBR (I haven't chrono'd it yet). I tried seating the bullet up to the lands and I think it was a bit much for this load. All of the .223 once fired brass had slight bulging at the webbing and the primers showed a little flowing. HOWEVER, all of the 5.56 Nato brass that was converted had no signs of excessive pressure on the case, but the primer still had the outie belly button (from flowing). I was able to score a 0.132" three shot group at 100 yards (after subtracting bullet diameter). I have a picture, but I'm having image hosting issues...

I'll see if I can get this load chronographed and we can get some numbers on paper.

Here is a summary:
Rifle:
Savage 11 Action (with Accutrigger)
McGowen 26" Chromoly barrel - 1 in 9" twist
Basic savage 11 tupperware stock
Nikon Prostaff 4-12x40 Mil Dot

Load:
Brass - PMC Bronze .223/Lake City 5.56
Bullet - Berger 90gr VLD Target
Powder - IMR 8208XBR - 25.5gr
Primer - CCI BR-4

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#2730912 - 10/15/14 10:00 AM Re: 6x45 Load data [Re: pcammo]
lpreddick Offline
New Member

Registered: 10/14/14
Posts: 5
Loc: tenneessee
i'm new to this forum since i had a beautiful and very accurate 6x45 bolt gun made: kreiger 13.5 tw, stiller predator V lprb, jewell 1.5 oz in a #11 shurley bros thumbhole laminate. an 8-32 sightron 1/8 min tgt dot scope is the icing on the cake. i downloaded the load data and really appreciate the work done to provide this data. i loaded new brass with n133 and a 62 gr knight and shots 2,3, and 4 printed in the ones! i have never had a gun so blasted accurate!!! just about every combo of bullet and powder shoot small hole but n133 seems to be the most accurate. currently trying LT 32 and it has promise. i have a problem(posted on the 6 MMBR site also). my redding 6x45 fl and neck die leaves .003 of runout in the neck. neck expansion in the die or with a wilson neck xp doesn't correct it. i now run the brass into a redding .223 body die(brings the neck to .257) then exp with a wilson 6mm mandrel and the r/o is gone. anybody with the same problem? any suggestions? thanks.

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#2746577 - 11/21/14 09:10 AM Re: 6x45 Load data [Re: lpreddick]
lpreddick Offline
New Member

Registered: 10/14/14
Posts: 5
Loc: tenneessee
LT 32, 25.1 and 25.3 .020 into the lands at 3330 fps and it shoots in the ones and the lower load shot in the zeros! using 65 gr fb conaway bullets. i'll have to try the LT 32 with other lighter bullets even though n133 works very well also.

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#2751888 - 12/02/14 07:24 PM Re: 6x45 Load data [Re: pcammo]
lpreddick Offline
New Member

Registered: 10/14/14
Posts: 5
Loc: tenneessee
Would like a little more speed with the very accurate 65s and recall how my 223 ackley increased my 223 performance. Has anybody any experience with a 6x45 Ackley improved? I expanded the neck of a 223 Ackley and seated a bullet and it looks good. Case volume with LT 32 increased almost 2 grains. Anybody done this? Thanks.

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#2752615 - 12/04/14 09:09 AM Re: 6x45 Load data [Re: lpreddick]
GLShooter Online
PM Sponsor

Registered: 01/09/05
Posts: 5332
Loc: AZ
Originally Posted By: lpreddick
Would like a little more speed with the very accurate 65s and recall how my 223 ackley increased my 223 performance. Has anybody any experience with a 6x45 Ackley improved? I expanded the neck of a 223 Ackley and seated a bullet and it looks good. Case volume with LT 32 increased almost 2 grains. Anybody done this? Thanks.


The Ackley approach might be intersting but I wonder if the gains will be worthwhile vs cost, silly concept, in performance. A rule of thumb is that for every 4% increase in case volume you realize about a 1% increase in velocity. Not hard and fast just a guesstamete. You are gainging right on 8% in volume so by that rule you are looking at 60-70 FPS.

You might post up in the reloading area. If most guys are like me they don't look here much even though I own four of them.

Greg
_________________________

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#2764528 - 12/25/14 12:24 PM Re: 6x45 Load data [Re: pcammo]
ab_bentley Offline
Die Hard Member II

Registered: 04/07/09
Posts: 1026
Loc: Dresden, Ohio 43821


Adam
_________________________

Originally Posted By: gary paugh
I once got off 9 shots at a running coyote I never would have been able to miss him so many times if I had a bolt action.

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#2764538 - 12/25/14 12:42 PM Re: 6x45 Load data [Re: ab_bentley]
eneranch Offline
Seasoned Member

Registered: 06/01/09
Posts: 249
Loc: Colorado Springs, CO USA
Good group, just under 0.6moa ; just curious about the 138 yds ??

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#2764563 - 12/25/14 01:47 PM Re: 6x45 Load data [Re: eneranch]
ab_bentley Offline
Die Hard Member II

Registered: 04/07/09
Posts: 1026
Loc: Dresden, Ohio 43821
Originally Posted By: eneranch
Good group, just under 0.6moa ; just curious about the 138 yds ??



Well, I had a range set up for testing. Then we built a house, right at the end of the range. On that house is a deck and being that I hate sunshine, rain, snow other various Ohio weather scenarios I put the bench on the deck, which was 38yds further back smile I went with it.

This was also my first load choice for the 6x45. It took me longer to make the target and put the reloading equipment away than to find a load that shot.

Adam
_________________________

Originally Posted By: gary paugh
I once got off 9 shots at a running coyote I never would have been able to miss him so many times if I had a bolt action.

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#2766400 - 12/28/14 05:06 PM Re: 6x45 Load data [Re: ab_bentley]
topweldor1 Offline
Seasoned Member

Registered: 11/07/12
Posts: 363
Loc: az, usa
Went through this whole post lots of good info. I can't seem to get the pdf, it take me to a buckammo page. Am I doing something wrong? Thanks in advance for any help. I am looking for a good 100 gr load for hunting.

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#2766940 - 12/29/14 09:44 AM Re: 6x45 Load data [Re: topweldor1]
eneranch Offline
Seasoned Member

Registered: 06/01/09
Posts: 249
Loc: Colorado Springs, CO USA
Originally Posted By: topweldor1
Went through this whole post lots of good info. I can't seem to get the pdf, it take me to a buckammo page. Am I doing something wrong? Thanks in advance for any help. I am looking for a good 100 gr load for hunting.


PM me your email & I'll send it to you.




Edited by eneranch (03/09/15 06:13 PM)

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