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I'd like a 6mm that will deliver a 105gn (or thereabouts) at 3000 fps with decent brass/barrel life. Easy until I say it must do it with a 20" barrel and a COAL of 2.4". It's also gotta feed reliably. I have a 6mm ARC but it's maxed out at 2880 fps with 22". The 6mm CM but is too long for my new action and the one I had didn't have a nice node at 3000 fps.
It's gonna be a hunting rifle.
Tell me about possible candidates like 6mm Dasher, 6mm GT and others in a NZ context.
What sized bolt face ?
243 with 8Twist.
@Wingman
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I think you would struggle to get 3000fps with a 20" barrel.Quote:
Originally Posted by TeRei
473 boltface
Won't fit. 2.4" COAL.Quote:
Originally Posted by TeRei
6mm saum
Might get a 6xc or 6x47 to go that fast and be short enough (case length) but long barrel life and fast projectiles/ hot loads don't usually go together
What Action do you have ?
2.4 is really going to limit you .
3000fps in a 6mm is not conducive to long barrel life no matter what Cartridge/100gn + Projectile combo you are running.
A 6x47 L will do the trick. Mine easily did 3080 with 105s. It's a simple job to neck down the parent 6.5.
6 x 47 Lapua, goes pretty well, accuracy to make any Creedmoor jealous :)
Don't have my data on me except in Shooter, can't remember barrel length, probably 20-22" though :(
110 A-Tip at 3025 fps with accuracy to make you think WTF...I just did that ??? :cool:
All the high performance 22-6mm cartridges are hard on themselves if heated up :(
I managed to get 2910 with 243 and 105 Targex in a 20 inch barrel, but it's too long of a cartridge for this project.Quote:
Originally Posted by Shearer
If you decide to go 6x47L, I actually have a three die Redding set sitting here lonely.
I have "standard" & "match" 6 x 47 Lapua reamers & plenty of US Cut barrels in stock :)
Hmmm, 6x47 sounds interesting and I already have spare 6.5x47 brass.
The gt fits your needs maybe abit less speed but fclass accuracy from easy to get powders and nice on barrels
What kind of hunting are you doing? Unless you’re bombing up goats with long strings of fire, shouldn’t it be sweet for years if just knocking over a few deer here and there?
How well does the 6x47 feed from a Mag ?
6GT is probably your best bet with a 308 bolt face if you can find a short enough bullet to come under 2.4".
The BRs and Dasher class cartridge aren't going to get you 3000fps from a short barrel.
No problem with my Tikka :)Quote:
Originally Posted by Ground Control
A GT will easily do 3,000fps with a 105gr class projectile, loaded at normal length. But at 2.4” COAL, the boat tail will be well below at case neck shoulder junction, so a 95gr might be easier to make work.
Whichever projectile you use, your jump would be massive. I run 105gr Bergers and Targex at 2.580” COAL, about 30-50 thou jump with a 0.120” freebore chamber.
Photo below Targex loaded to 2.580” as comparison with a Berger 95gr VLD Hunting (boat tail about case neck shoulder junction) and then a Targex 105gr RBBT at 2.4”.
Attachment 243290
I think your length restriction makes that goal pretty difficult.
I have a 6xc which is a touch shorter than your Creedmoor was. 105's are still 2.7" when seated out properly. 3k in a 22" is about its limit and it should be good for 2-3k rounds of hunting use.
The 6mm-204 Ruger I've been shooting is also about 2.6" with heavies. Great barrel life. But it won't deliver anything close to 3000fps. Kinda rules out 6x45 too.
The BR's, GT's and Dashers will be a bit long and won't give you 3k in a short barrel either. Guys with 28" barrels on a couple of the YouTube channels I watch seem to be pushing that 105gr class up to around 2800-2900".
I can't remember how long a 243 WSSM is. It would probably give 3k in a short barrel but barrel life will not be great. Wrong bolt face. And crappy brass options.
Yeah mate. Asking a bit much there.
Where did you get a 243WSSM reamer?
