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Hot Topic (More than 30 Replies) What 6x45 loads are you guys using? (Read 11030 times)
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Re: What 6x45 loads are you guys using?
Reply #60 - May 3rd, 2018 at 3:03pm
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Few more results.

55gr Noslers again under 28gr N133 = 3214fps. So gained some fps there with a change of powder.

Accuracy wise, average to poor 1.5MOA which in this cal should be better. The N113 on first glance looked to show the most promise.

The distance these little 55gr pills have to jump to the lands is rather large as the freebore in this rifle was made to suit pills in the 70-85gr range with 75gr being optimum.

Tried some 75gr Speer flat base under 25gr N113 did around 2817 for 1MOA.

There were no real pressure signs anywhere so I think I have some start points. I cant get enough N113 into the case for 55gr pills anyway so that option is out. Seems to be spot on for 75gr projectiles however so will use it up there.

All good stuff.


  
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Re: What 6x45 loads are you guys using?
Reply #61 - May 4th, 2018 at 10:43am
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Light 55's are fun to try, but the real advantage with the 6x45 is 75-85gr. Your 1:8 has shown it's preference for the heavier weight. Be good to see the results of those 75's with a bit more H335  Wink
  
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Re: What 6x45 loads are you guys using?
Reply #62 - May 4th, 2018 at 1:43pm
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I think 27.5gr H335 is about Max for me with the 75's. The 1:8 twist likely produces slightly higher pressures than say a 1:10 or 1:12.

I've got some Speer 75gr flat base pills to try as well now. The 6x45 likes the flat base pills is what I am hearing out there, certainly gives a bit more bearing surface in the neck area which helps get the ogive closer to the lands and also helps with room behind the pill for powder.

I'll keep ticking away.
  
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Re: What 6x45 loads are you guys using?
Reply #63 - May 4th, 2018 at 3:59pm
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6x45 wrote on May 4th, 2018 at 1:43pm:
I have some H4198 that I should put behind the remaining 55gr Noslers to see how they shoot.

I think 27.5gr H335 is about Max for me with the 75's. The 1:8 twist likely produces slightly higher pressures than say a 1:10 or 1:12.

I've got some Speer 75gr flat base pills to try as well now. The 6x45 likes the flat base pills is what I am hearing out there, certainly gives a bit more bearing surface in the neck area which helps get the ogive closer to the lands and also helps with room behind the pill for powder.

I'll keep ticking away.


Yep the Sierra 75gr HP I use are flat base and they go well. The Sierra BTHP in 85gr (Game King) showed good stability in my 1:10 and I will be back onto them as well soon.

All looking good 6x45  Smiley
  
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Re: What 6x45 loads are you guys using?
Reply #64 - May 4th, 2018 at 5:01pm
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Im wondering if I am worrying about my distance to lands to much. Most ppl are restricted by mag length and I went to some trouble to increase mine to around 2.4" (I should measure it again). Lots of the load data I have seem to be in the 2.260COL range.

My current 75gr pill load has about 5mm of pill inside the neck. Maybe I should increase that to at least the bullet diameter as commonly recommended?

Anyway, 27.5gr of H335 behind a 75gr FB Speer gives me 2884 out the 18" tube. Think after 26.0grs of H335 I have reached the point of diminishing returns out of this setup as I get 2875 fps with that load with the 75gr Seirra FB.

It's a pretty sweet and forgiving cartridge to play with.

Have some RL10X here as well and Varget.

I was told the VV powders are going up 100% in NZ soon. I got the last N133 1lb tub the shop had left. Plenty to play with.

  
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Re: What 6x45 loads are you guys using?
Reply #65 - May 5th, 2018 at 1:31pm
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Had a play with finding a start point for Reloder 10X and the left over 55gn Noslers this morning. Hard to find data on the RL10X so I started at 223 55gr loads and soon figured out that wouldnt be enough for the 6mm 55gr pill in 6x45.

23gr = 2552fps. WAY slow and the primer looked like it a nice round mushroom. Similar story all the way up to 25.5gr when I hit 2822fps. Still slow and primer looked okay. The black marks are just dirty brass, got a ton of 223 brass from the M4 culling days.



Got up to 26.5 and still no reel pressure signs. Hit 3043fps here

Primer still okay, maybe a bit of a mark from the extractor but hard to see.



Loaded 3 sets of 3 around 26.5gr of RL10X and will have a play with them later to see if they shoot.

The only data I could locate for the RL-10X was 24.8gr developing 52.0KPSI but the is in a tottally different setup. Out on a limb here but no reel pressure signs and I'm just getting the powder to below the bullet base. The chrony results would also suggest I'm conservative.
  
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Re: What 6x45 loads are you guys using?
Reply #66 - May 5th, 2018 at 8:52pm
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Quickload (with "factory settings except for barrel length which I've set to the 18" you mentioned) says 26.5 of RL 10x should give you 3287 fps at 53,379 psi.  A measurement of fired case capacity in H2O and COAL would allow Quickload to hone in a bit closer to your actual rifle.
  
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Re: What 6x45 loads are you guys using?
Reply #67 - May 6th, 2018 at 7:30am
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ArmedTramper wrote on May 5th, 2018 at 8:52pm:
Quickload (with "factory settings except for barrel length which I've set to the 18" you mentioned) says 26.5 of RL 10x should give you 3287 fps at 53,379 psi.  A measurement of fired case capacity in H2O and COAL would allow Quickload to hone in a bit closer to your actual rifle.


Thanks heaps. Good to know.

My COAL = 59.15mm and the H20 cap of the case is 30.8gr as best I could figure. There were variances in the brass which wasnt helping and wont be helping. Its FC brass.

Out of interest I made a 100gr load using 5.7gr of TRAILBOSS and was getting 1020fps. With the can on it was printing holes at 60yards but was way to low to get out to 100 on how my scope was set up. Cool way to get rid of 100gr pills I am never going to use anywhere else.
« Last Edit: May 6th, 2018 at 3:52pm by 6x45 »  
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Re: What 6x45 loads are you guys using?
Reply #68 - May 7th, 2018 at 11:01am
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Mathias wrote on May 4th, 2018 at 10:43am:
Light 55's are fun to try, but the real advantage with the 6x45 is 75-85gr. Your 1:8 has shown it's preference for the heavier weight. Be good to see the results of those 75's with a bit more H335  Wink


Well I went a little bit more for you. 27.5gr H335 under the Sierra 75 #1510's. 5 shots at 100yds.



This is definitely the top end for my rifle. Primers getting flat now and slight cratering on some I noticed.

Clipping along at 2975fps today (which is about 100fps faster than QL predicts). COAL was 60.2mm which means I have 5.18mm held in the case neck. I can get closer to the lands with this pill but I've always believed you need a bullet diameter held in the case? Although some info suggests as long as it is "holding" the projectile.

I'm ordering some new brass, time to get serious on the development front now.


  
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Re: What 6x45 loads are you guys using?
Reply #69 - May 7th, 2018 at 3:34pm
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6x45 wrote on May 7th, 2018 at 11:01am:
Mathias wrote on May 4th, 2018 at 10:43am:
Light 55's are fun to try, but the real advantage with the 6x45 is 75-85gr. Your 1:8 has shown it's preference for the heavier weight. Be good to see the results of those 75's with a bit more H335  Wink


Well I went a little bit more for you. 27.5gr H335 under the Sierra 75 #1510's. 5 shots at 100yds.



This is definitely the top end for my rifle. Primers getting flat now and slight cratering on some I noticed.

Clipping along at 2975fps today (which is about 100fps faster than QL predicts). COAL was 60.2mm which means I have 5.18mm held in the case neck. I can get closer to the lands with this pill but I've always believed you need a bullet diameter held in the case? Although some info suggests as long as it is "holding" the projectile.

I'm ordering some new brass, time to get serious on the development front now.



That looks familiar for a 6x45  Wink   They are a very accurate little bullet. I get a slightly flattened primer too and have never gone past that load weight. Good speed from an 18" barrel too  Cool


  
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Re: What 6x45 loads are you guys using?
Reply #70 - May 10th, 2018 at 7:20am
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nice results there 6x45,
That group with the 105 A-Max at 200m looks pretty good, do you know what speed they doing ?

  
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Re: What 6x45 loads are you guys using?
Reply #71 - May 10th, 2018 at 5:15pm
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canadakiwi wrote on May 10th, 2018 at 7:20am:
nice results there 6x45,
That group with the 105 A-Max at 200m looks pretty good, do you know what speed they doing ?



Nah. I only threw 3 down range to see if they would even work. Surprised me for sure. Prob only got a 1/4 cup of H414 left and maybe a doz of those AMax pills so I wont be going down that road too far. They'd be slow and I doubt they would be that stable after 300yards.
  
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Re: What 6x45 loads are you guys using?
Reply #72 - May 10th, 2018 at 7:43pm
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seventenths wrote on May 3rd, 2018 at 10:01am:
I'm liking your results there 6x45

I've always wanted a 6x45 and Mathias has been a bad influence!

I looked for a Sako Vixen action last year to modify but when i bought a Sako A1 in great condition i left it as is but i've since bought a second hand Remington ADL in .223 so that will be my donor rifle.

I'm wanting to run a shorter 18-20 inch barrel with 75 gr projectiles... keen to know what your thoughts are with bullet speeds etc???

What is your rifle?


Sorry only just saw this.

My rifle is a Tikka T3. Barrel is a Hardy 1:8. 18". Can is theirs also, a Gen VI. The jury is out for me on how good the can is, but it is fine. Ive had better and Ive had more expensive. Always liked my ACE Jet-Z.

MAKE SURE whatever you do you make sure you get the freebore spot on for 75-85grain pills. You want to get them seated as far out as reasonably possible so they dont take up too much case room.  There simply isn't enough room in the 6x45 boiler to make it any real use for 90-105gr 6mm pills. Everything I have read or heard tells me it was made for the 75-85gr pill range.

Also make sure you design your setup so you can have a mag that handles loads 2.4"-2.5" OAL. I went for a AI setup and changed the bottom metal on my Tikka so it takes AI mags.
« Last Edit: May 11th, 2018 at 6:47am by 6x45 »  
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Re: What 6x45 loads are you guys using?
Reply #73 - May 11th, 2018 at 3:50pm
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6x45 wrote on May 10th, 2018 at 7:43pm:
seventenths wrote on May 3rd, 2018 at 10:01am:
I'm liking your results there 6x45

I've always wanted a 6x45 and Mathias has been a bad influence!

I looked for a Sako Vixen action last year to modify but when i bought a Sako A1 in great condition i left it as is but i've since bought a second hand Remington ADL in .223 so that will be my donor rifle.

I'm wanting to run a shorter 18-20 inch barrel with 75 gr projectiles... keen to know what your thoughts are with bullet speeds etc???

What is your rifle?


Sorry only just saw this.

My rifle is a Tikka T3. Barrel is a Hardy 1:8. 18". Can is theirs also, a Gen VI. The jury is out for me on how good the can is, but it is fine. Ive had better and Ive had more expensive. Always liked my ACE Jet-Z.

MAKE SURE whatever you do you make sure you get the freebore spot on for 75-85grain pills. You want to get them seated as far out as reasonably possible so they dont take up too much case room.  There simply isn't enough room in the 6x45 boiler to make it any real use for 90-105gr 6mm pills. Everything I have read or heard tells me it was made for the 75-85gr pill range.

Also make sure you design your setup so you can have a mag that handles loads 2.4"-2.5" OAL. I went for a AI setup and changed the bottom metal on my Tikka so it takes AI mags.


Long throating - freebore, whatever you want to call it can be a bit misleading. By making your throat longer and seating out your bullets to create more room for powder can have diminishing returns after a point. I know as I have been there & done that with another caliber and the net result achieved was 1/2gr more powder required to achieve the same velocity before lengthening the throat. Anyone with Quickload will work this out, without doing the actual exercise.
Definitely make sure you get the bullets out of the shoulder area and at base of neck minimum if you can. On mine, any pointy bullet with a long ogive reaches the lands at about 60-61.5mm but my mag only does 58.5mm, thats why I use the older style blunt profile bullets so I can get close enough to lands.
  
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Re: What 6x45 loads are you guys using?
Reply #74 - May 11th, 2018 at 4:47pm
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Good info.

I cant get my 75gr Seirra FB #1510 pills close to the lands. I cant remember the actual OAL but I think I used QL to put them at 60.38mm OAL which is about 5mm into the neck.

The 85gr Seirra #1520 will be pretty close to spot on when they arrive.

Also the Barnes 62gr Varmint Grenade when loaded to the recommened 0.050" off the lands makes them 61.47mm OAL for me which takes up a bit of room in the case because the end up being seated 8mm into the case neck. That pill is 0.978" long.

Its all fun stuff. I've got some CFE223 on the way as well. I've heard that needs to be near max to burn clean but looks promising for the 75-85gr pill range. I've got plenty to play with for now.

Does anyone know why there are 2 choices in Quickload for 6x45? One is 6x45mm the other is 6x45 (223). They are slightly different and give different outputs.
  
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