Thread: Tikka 6x45 / 6mm-223

Originally Posted by Bagheera

@phillipo did you have one of these ?

Yeah mate close, I had a 6mm 204 ruger built by KG. Fuck it was a great gun n caliber, 87 grainers @ 3000fps like a laser & sacked everything from bunnies to big SI roos out to 600 yards, farken loved that gun was such a great alrounder from doing Gilly field events to bowling things

Just spent 30min's trying to find some of those pics but fuk knows where in my puta or the cyber they have disappeared too

Originally Posted by Mathias

My 23" 1:10 6x45 chucks out Sierra 85gr HPBT @ 2918fps using CFE223.
Same load in my 20" 1:8 6x45 does 2834fps. The CFE223 is the slowest powder I've used and most suited to 80gr + bullets.
I regularly run 75gr Sierra HP with H335 for about 3000fps in the 20" rifle.

By having a longer throat you'll achieve pretty much the same velocity but burn more powder to do it. This I have proven in another caliber. A long throat is great for those 80gr+ bullets when using something like CFE223, as it's a high density load.

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What's the OAL of your 1:8 20" 85 grn load? Wondering what mag it would fit into of the .223's Ive got if I was to re-barrel.

Originally Posted by Tahr

What's the OAL of your 1:8 20" 85 grn load? Wondering what mag it would fit into of the .223's Ive got if I was to re-barrel.

I would also be interested in knowing this

I spent 30 minutes yesterday sizing 50 new Starline cases for initial testing , and I'll reload them today with a few different combinations of Powder/Projectiles .
This is my first time playing with expanding/altering a Cartridge and I can't believe how easy it is .
Lube the case , a single stroke of the Press and they are ready to load .

Originally Posted by Tahr

What's the OAL of your 1:8 20" 85 grn load? Wondering what mag it would fit into of the .223's Ive got if I was to re-barrel.

58.08mm OAL for both rifles, but for the 20" gun I have to pull it back to 56.9mm to eject a loaded round, due to it not clearing the port. I could fix this with a minor mod to the ejector / bolt stop but just left as is for now. Have over 200 75gr loaded to that OAL.
These Sierra 85gr HPBT are a stubby nosed little bullet, just like the 75gr HP, they lend themselves well to short mags and OAL.

Originally Posted by Mathias

58.08mm OAL for both rifles, but for the 20" gun I have to pull it back to 56.9mm to eject a loaded round, due to it not clearing the port. I could fix this with a minor mod to the ejector / bolt stop but just left as is for now. Have over 200 75gr loaded to that OAL.
These Sierra 85gr HPBT are a stubby nosed little bullet, just like the 75gr HP, they lend themselves well to short mags and OAL.

Ta. So they will fit into pretty much any .223 mag then (Tikka is 2.3"/58.42mm).

Originally Posted by Tahr

Ta. So they will fit into pretty much any .223 mag then (Tikka is 2.3"/58.42mm).

None off my 6x45 reloads smallest being 70gn mk will not fit in a standard tikka 223 mag, I run aics mags notiched with a dremel.

Here is a photo of the Dummy round that was sent to the Gunsmith so he could throat the barrel 20 thou jump .

This has an OAL of 60.6mm , the 6x45 in theory is designed to have the same OAL as the standard .223 which is 57.4mm so it will function in AR15 type Rifles/Magazines .
As you can see from the photo if I was to seat those Sierra 85gn bullets to 57.4mm then there would be an extra 3.2mm of projectile protruding into the case and that of course means less room for powder .
My research strongly suggests if you can ( Bolt Gun / Magazine length etc ) to set the Sierra 85gn up at an approx OAL of 2.4 inch (60.96mm) .
I chose to go a fraction shorter so that the Rifle is throated in a way that will allow some other projectiles to work better ( in theory ) both longer and shorter .

Originally Posted by Doon

None off my 6x45 reloads smallest being 70gn mk will not fit in a standard tikka 223 mag, I run aics mags notiched with a dremel.

left to right 75 gn sierria hp 59.2 mm,85 Gameking 59mm,95 gn Targex 62.6 mm 90gn sierria gamechanger 64mm. 223 accurate mag. ruger aics mag, standard tikka 223 mag

@Philipo sorry about the spelling.

Can people tell me whats the difference betweeen .223 and 6mm ? ( .04 mm I know)
Is it heavier bullet weights are easier to find ? Or shorter for COAL ?
On better barrel twists available ?
Or just opening up the calibre gives a smidgeonmore kinetic energy ?

Originally Posted by Doon

Attachment 242618

left to right 75 gn sierria hp 59.2 mm,85 Gameking 59mm,95 gn Targex 62.6 mm 90gn sierria gamechanger 64mm. 223 accurate mag. ruger aics mag, standard tikka 223 mag

Do you know how fast the 90gn Sierra's are going ?
I have a 200 of them to play with , but thought I'd start with the 85gn Sierras because of the great reports from overseas about their on target performance

Originally Posted by Bagheera

@Philipo sorry about the spelling.

Can people tell me whats the difference betweeen .223 and 6mm ? ( .04 mm I know)
Is it heavier bullet weights are easier to find ? Or shorter for COAL ?
On better barrel twists available ?
Or just opening up the calibre gives a smidgeonmore kinetic energy ?

Dunno. I just keep looking at all the 6mm projectiles Ive got and wonder what Im going to do with them. I could plant them into wallaby with one of these.

Originally Posted by Ground Control

Do you know how fast the 90gn Sierra's are going ?
I have a 200 of them to play with , but thought I'd start with the 85gn Sierras because of the great reports from overseas about their on target performance

90GN Sierria gamechanger 2800fps. the 95gn targex are 3 shots touching.stillworking on the 90 GC as they are not as accurate as the targex (still under moa though)

Im running a 1/8 twist throated 30 thou.

Originally Posted by Bagheera

@Philipo sorry about the spelling.

Can people tell me whats the difference betweeen .223 and 6mm ? ( .04 mm I know)
Is it heavier bullet weights are easier to find ? Or shorter for COAL ?
On better barrel twists available ?
Or just opening up the calibre gives a smidgeonmore kinetic energy ?

There aren't many .223 Rifles that can throw a 80gn plus Projectile at the velocities that a 6x45 can with barrel lengths of 20 inches - 24 inches .
As a few respondents have already mentioned here they are achieving results/performance with heavier bullets that a .223 just can't match ( not easily anyway , 28-30 inch barrels and really pushing the limit's of safety )

I have got a cooper 6x45, with 20” tube, i am running 85 gr serria soft points or partions, to 2880 fps with CFE.223, and 75 gr serria HP to over 3000 again with CFE.223, benchmark was the best powder for light bullets, BLC2 and CFE game me best results with 80 gr up, i think the 90 gr ELDX might be a great bullet to try.
I load to 60 mm, as i have a bit more room, in the cooper than say a sako or CZ action,
Great we rifle,
Pitty the old hunting and fishing forum is gone, was a brilliant thread on there for the 6x45.

Originally Posted by southernman

I have got a cooper 6x45, with 20” tube, i am running 85 gr serria soft points or partions, to 2880 fps with CFE.223, and 75 gr serria HP to over 3000 again with CFE.223, benchmark was the best powder for light bullets, BLC2 and CFE game me best results with 80 gr up, i think the 90 gr ELDX might be a great bullet to try.
I load to 60 mm, as i have a bit more room, in the cooper than say a sako or CZ action,
Great we rifle,
Pitty the old hunting and fishing forum is gone, was a brilliant thread on there for the 6x45.

https://www.nzhuntingandshooting.co....-barrel-56502/
19 pages here of reading material.