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I’m in the process of getting a Tikka T3 rebarrelled to 6x45 / 6mm223 .
The new 6mm barrel is a 1 in 8” twist and I’ll be using a Waters magazine to allow for longer cartridge oal .
I want to run projectiles in the 75gn - 90 gn range .
Because of the modest velocities that will be achieved ( compared to the usual 243 / 6mm CM etc velocities) I’m trying to narrow down my projectile choices to find a 6mm bullet that will expand reliably at the slower speeds .
Any suggestions ?
87g vmax
Using them in plenty of 6mm/223 chamberings
Cheers :thumbsup:Quote:
Originally Posted by 7mmsaum
Do they hold together at those velocities or do they fragment ?
I have suggestion. And question. Why??? And why not fast twist 223 as can run those weights lol.
And in answer to your question.something from a black or old yellow box.
I've used a lot of 70gr blitzkings and speer TNT's in my 6mm-204 Ruger at 3100-3200.
Anecdotal, but surprisingly the bliztkings have held together enough to punch though pigs at 150-200m. I've not had a chance to line up on one with a 6mm TNT yet but I did get one with a 50gr TNT from my 223 (3300fps) - it went through the shield and completely shredded the heart and lungs at 150m. Nothing really touched the ribs on the far side let alone made it through. I'd expect 6mm ones to behave similarly.
If I wanted something guaranteed to hold together and penetrate, I'd opt for a nosler ballistic tip or the lightest barnes ttsx I could get.
I have 3 x .223 rifles ( 2 x Howa’s and 1 x Tikka ) the Howa’s actually shoot better ( 77 TMK’s ) than the old Tikka and I was contemplating selling it .Quote:
Originally Posted by Micky Duck
Buttt…… after some reading it dawned on me that turning the Tikka into a 6x45 would be fun for a number of reasons.
1 - it will be my first attempt at altering brass / wildcatting .
2 - the 6x45 is actually more efficient and produces higher velocities than the equivalent 22 cal bullet weights .
3 - the Waters magazine that I purchased to allow longer oal in the .223 is really applicable to the 6x45 and will allow me to maximise powder/ potential of the cartridge, something that can be an issue when loading to the original .223 lenght .
4 - Just because :)
I use 70 gn Sierras in my mini mauser. Seem to work just fine , no complaints from the recipients so far
#4 is enough lol. Speer TNT in .308 don't exit small wallabies.... I would bet Rushey's left ball they will expand for you at your velocity in 6mm.
85gr HPBT Sierra, 80-85gr SP Speer & 87gr SP Hornady all do what you are asking. CFE223 will be your friend for those weights.
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70 gr Targex should work too.
I don’t actually know how to answer that question sorryQuote:
Originally Posted by Ground Control
They just kill things, I have never gone looking for the projectile
I’ve tried the following in mine:
55gr SBK. 68gr Shillen, 68gr Berger, 70gr SBK, 70gr Nosler BT, 82gr Tusker(my own brand), 85gr SGK, 95gr Goodnell(Mono).
I settled on the 70s. Good speed, crazy accurate and kills out to 300m with ease.
A good mate of mine kills a LOT of animals with the 75gr Vmax in his 6x45, including red deer stags. They’re doing 3000 fps so you’ll be fine with the 87gr Vmax for sure.
In fact, with what I’ve learned from the .223 and 6x45 I think the 87 Vmax is possibly the best bullet you could load for it.
Got some Sierra 85hpbt / Hornady 87hpbt to start playing with and will get some 87Vmax in the future .
Cheers for all of the replies :thumbsup:
I have used 70 gr match king, 75 grain v max,75gr sierra hp, 80gr nosler ballistic tip and 85gr sierra hp. The 80gr ballistic tip is by far the best performer on game.
Keep us 6x45ers posted on progress please, be keen to see some results [emoji16]Quote:
Originally Posted by Ground Control
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Here are some of my loads for the 6x45
Sierra 85 BTHP gameking
powder 8208 26.5 gn
fed 205 primer
ADI brass 1.955 to ogive
velocity 2900 fps
targex 95 gn
hornady brass 1.980 to ogive
powder 8208 26 gn
fed 205 primer
velocity 2750 fps
58 gn vmax
powder 8208 27 gn
adi brass 1.862 to ogive
fed 205 primer
velocity 3134 fps
Sierra 70 gn hpbt
powder 8208 27 gn
fed 205 primer
winchester brass 1.953 to ogive
velocity 2990 fps
Rifle rem 700 20" shilen select barrel throated 30 thou 1/8 twist
All loads in this rifle are 1/2 " or smaller, targex are 3 shots touching.
@Doon, you might want to think about dialling those loads down.
Hodgdon provide data for 6x45. Under the 95gr section there is data using Accurate and Ramshot powders. None of the speeds exceed 2600fps and they're all right on 55,000psi of pressure. I don't see how you're going to get ~175 fps more from a 4" shorter barrel with 8208, without it being way over that.
For the 70gr and 85gr bullets, you're at the max load and again you're getting more speed from your shorter barrel. The pressure on the Hodgdon site is given in CUP for 8208 though which is a bit vague.
Thanks for your concern @PommyQuote:
Originally Posted by Pommy
Yes I am at max load as per ADI load data but worked up using a magneto speed observing velocitys.
The chamber has been throated so will not be as compressed as a normal load data.
Data – Rifle – ADI World Class Powders and Ammunition
As per velocitys maybe im lucky and have a fast barrel, it has over 400 dowm the pipe.
Yeah so if your rifle is throated longer and you're seating the bullets out, a given charge weight should give less velocity because you're increasing the effective case capacity which is reducing pressure.
The fact you're still getting more despite your 4" shorter barrel, suggests something else (such as lot to lot variation) is going on. The chrono numbers that you're carefully observing are a red flag.