6x45

[Kb]

I'm thinking about building a 6x45 bolt gun and would like to hear a few opinions on appropriate twist rates. It has been my experience that guns will usually stabilize bullets that according to the charts they are not supposed to and shoot accurately as well, two examples, I had a 6.5 IHMSA that shot 142's very accurately with a 1-9 twist barrel. The other is my current 700 Remington .223 1-12 twist that does quite well with 69grain bullets at 500m.
Here's the question, anyone ever shot 105-107 6mm bullets out of a 1-10 twist barrel? Please comment from personal experience.
Kb

 

[ar10ar15man]

my question is WHY ?
WITH THAT HEAVY OF A BULLET AND THAT SMALL CASE CAPACITY....no velocity...
so why ??

 

[Killshot]

KB, first off welcome to the best shooting forum on the web. The Search function here is sub-forum specific and doesn't sort by date but you'll find a wealth of information.

As to your Q, most have found stabilization issues with a 10 twist and the heavy 6mm bullets. And as ARman notes, velocity will also be an issue.

If you already have a .223 that works in the lower weights I recommend a look at a straight 6BR instead of that 6x45 to launch the 105/107s.
Simple, proven, out-of-the-box, no B.S. accuracy.

 

[Kb]

I had shoulder surgery about a year ago and can't take the recoil on top of the attachment screw, I have thousands of 223's and would like to use them as opposed to buying 6br cases, also I want to be able to load the magazine with 5 rounds and have them feed nicely.

 

[ar10ar15man]

recoil is gun weight/bullet wieght and velocity..if you shoot 100's out of a 223 case...you are going to have recoil....
again why shoot 100's ...why not 80's or 77 or 75's out of 223 cases....

 

[TC260]

Can't help with the twist rate but if a 6x45 trips your trigger, build it. Might look at a 6 TCU as well. Haven't looked into it but may have better die availability and has a little more capacity. When I checked mine, a 7 TCU was only about 3% less case capacity than a 7 BR.

 

[greg8012]

I made a 20/223 practical on a remington action with a boyds thumbhole stock shoots fantastic.. I bought the reamer and a 20 cal neck reamer from PTG and lenghtened the throat a few 1000th and really shot well. Tips over prairie dogs 400yds out. I bought the dies from 4D tool and die about 80 bucks.. It out shoote my 222 and 223 remingtons very low recoil I have a heavy barrel screwed into it. Greg

 

[5spd]

I had an AR15 built in 6x45 w/a 20" SS bbl, in 2011 I sold it & built on a bolt action gun 6x45 on a Savage action.
Savage has a 24" SS bbl. 6 groove.
Both were/are 1/10" twist and will handle everything from the 55g to 95 gr bullets withe ease & VERY accuratly to 700yards. Now at 700 yds I would NOT use it on anything bigger than a coyote as the energy is pretty much lost, but it will still smack steel out there w/a 95g load.
I have thus went to just using an 80g bullet for antelope/deer and a 65g vmax for coyote.
There is no reason to put a heavier bullet in it as you wont have the speed for them. The 95g Nosler HBT antelope load at top end is at 2588 fps and seats pretty deep into the charge for a COL of 2.290".
Now a 100g or longer buller will be even more compressed and a lot slower at about 2200-2400fps or even slower. At 2500 fps w/a 100g bullet the pressure is at max.
I have NOT shot any weight over the 95g bullet and everyone I know w/a 6x45 does not shoot heavier bullets either. 99% of the 6x45 shooters stick w/the mid weight bullets.
What will your end use be?

I am also building a 20x45 (20 practical) since I have thousands of .223 brass also.

 

[Catfish]

AR 10 AR 15 man hit it on the head. I have a 6 x 47 and have a friend with an AR upper in 6 x 45. Mine is a bench gun set up for 70 gr. bullets and his is also set up for 70 gr. bullets. The 6 x 45 is a great shoet range round, but is very lacking for long range where a high BC bullet is needed. No offence intended, but I think it would do you alot of good to study something about the BC of bullets, and some wind drift and drop charts. By the way a 10 twist is no good at all for the 105 or 107 bullets, you will need a 7 or 8 twist to geet anu accuracy at all. Reading is cheaper than buying barrels and experimenting.

 

[Kb]

Thanks for the information guys, I'm probably going to go with the 1-8 twist barrel and have the throat cut longer for the 105's and 107's as to not have them protrude into the powder space excessively.
Humorous anecdote; an old guy I used to shoot hbr with and I were talking one day at a match, somehow the conversation turned to mv, I asked him if he ever chronographed his loads whereas he responded, "I don't really care how fast there going {bullets}as long as they get before the target setters!" He passed away at the ripe old age of 86 a few years ago, I'll never forget his clever sense of humor.
Kb

 

[trentalan34]

I have a 1:10 AR that is extremely accurate, but I do not shoot anything over 87 grains. That is a result of both bullet stabilization and magazine length. I think the 6x45 really shines in the mid-weight bullets.

 

[Wacoplan]

Has anybody got a recipe for 70 TNT, in 6x45? I grabbed some powder today, thought I was getting H 4895, but got IMR 4895. Can't find any 6x45 data from Speer. I don't know if speer bullets have the same ogive as hornady. Really hard to find components.

 

[Bc'z]

Has anybody got a recipe for 70 TNT, in 6x45? I grabbed some powder today, thought I was getting H 4895, but got IMR 4895. Can't find any 6x45 data from Speer. I don't know if speer bullets have the same ogive as hornady. Really hard to find components.

Hey welcome to the forum, I'm gonna bump a page with all the information your gonna need.

 

[Wacoplan]

Thanks,

 

[Wacoplan]

Hey welcome to the forum, I'm gonna bump a page with all the information your gonna need.

Where can I find it?

 

[Bc'z]

Where can I find it?

Hold that thought I just figured out cut and paste.
I'll post it here in a minute.

Edit, http://forum.accurateshooter.com/attachments/6x45-loaddata_8_1-pdf.1163030/

These are solid recipes I've been using for a couple years.
As always start low and work up.

 

[biggun2869]

Hold that thought I just figured out cut and paste.
I'll post it here in a minute.

Edit, http://forum.accurateshooter.com/attachments/6x45-loaddata_8_1-pdf.1163030/

These are solid recipes I've been using for a couple years.
As always start low and work up.

What I have is TCU but I wouldn't think 6X45 would really be much different. I love it but If I felt the need for a bigger-heavier bullet I would use something bigger. The 6x45-6TCU is awesome as far as accuracy and kill power go. Just don't use it on an animal bigger than a deer. Could you? Probably with a good shot but there is really no reason in today's world.

 

[Bc'z]

What I have is TCU but I wouldn't think 6X45 would really be much different. I love it but If I felt the need for a bigger-heavier bullet I would use something bigger. The 6x45-6TCU is awesome as far as accuracy and kill power go. Just don't use it on an animal bigger than a deer. Could you? Probably with a good shot but there is really no reason in today's world.

1n10 twist
I'm not even sure I can get em to fly right, but I feel compelled to try.

 

[Wacoplan]

Hold that thought I just figured out cut and paste.
I'll post it here in a minute.

Edit, http://forum.accurateshooter.com/attachments/6x45-loaddata_8_1-pdf.1163030/

These are solid recipes I've been using for a couple years.
As always start low and work up.

Just what I needed, thanks.

 

[Wacoplan]

Has anybody got a recipe for 70 TNT, in 6x45? I grabbed some powder today, thought I was getting H 4895, but got IMR 4895. Can't find any 6x45 data from Speer. I don't know if speer bullets have the same ogive as hornady. Really hard to find components.

Thanks for the information. I discovered a problem, I had 100 rounds of NPA brass that I sized, trimmed, and primed. Not one of them would chamber. At first I thought I got bad dies. Then on a whim, I sized a couple of LC brass. They fit perfectly. So now I have 100 rounds of primed brass that is worthless. I am hesitant to try and push the primers out.