I have been thinking over the last several months that I need to build myself a new varmint rifle for this next season but in looking at the arsenal I already have, the only really lacking area would be for a high volume shooter for use on gophers and P. dogs out to say 400 yards max.
Anyway, have been thinking about this and have come back to the same round every time. See, the goals I have for this rifle chambering will be as follows:
-300-400 round per day shooting volume
-400 yard reach
-Want 500 rounds loaded up at all times ready to roll
-Very low risk of bullet bouncing around after shots down range
-Very low recoil
-Good valocity for flat shooting out to 400 yards
-low muzzle blast
I am not opposed to wildcats but do not want to fireform. With a high volume shooter, forming 500 or more cases just is not practical in my opinion. Sure you can form while shooting but do not want it. Wildcat options must be able to be cold formed.
What I keep coming up with is taking a 223 Rem for a parent case(cheap as hell) and necking it up to 6mm in a 1-12 to 1-14 twist. The bullets I will be using will be the 55 gr Ballistic Tip, 55 gr Blitzking or 60 gr Wildcat bullets.
So why a 6mm-223 Rem? Well, with these weight bullets, it will easily match standard 22-250 velocity levels with the same bullet weight in same length barrels because of the larger diameter bore. Also, if you look at the BC of the 55 gr 224 cal Ballistic Tip and the 55 gr 6mm Ballistic Tip, the 6mm has an advantage. Really get something for nothing here.
So why not go with the 6-250. WOuld be a great option, no doubt but I want as much barrel life as possible in this little rifle and there is no comparision between the two in this area. Sure I could get another 100-150 fps out of the 250 version but at a cost of barrel life. This was however my second choice.
With heavier bullets, the larger 6mm on the 250 case would have a certain advantage but I will not be shooting bullets over 400 yards out of this rifle, have an entire line of rifles that can reach out long way and almost as many small ones that can take care of the close range stuff.
THis one will be my 150 to 400 yard rifle.
Anyway, just curious what your thoughts would be on the ultimate 400 yard and under high volume varmint round would be for you. Since we are well into the cold of winter up here, need to start thinking about warmer days in the field reducing varmint populations!!!
Personally, I think a 6-223 Rem loaded with a 55 gr Blitzking to 3600 fps would be very hard to beat for this specific use.
The 6mm BR would also be a great choice and very hard to beat but the 6-223 would feed much better in a repeater as well, plus they damn near give away 223 cases now days!! Not quite the case for the BR cases.
Curious what yours would be. Got to smile when I sit here and imagine the rifles sitting out on the next varmint shoot, 218 Mashburn Bee for out to 200 yards, 6-223 for out to 400 yards, 22-250 AI for out to 600 yards, 6-284 for out to 1000 yards, and old Black Sunshine to play clean up from there on out!!! [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Your new little one must have you up again late at night?? it most likely wont be the last time.
to me the cartridge you are looking for is a dirty old 222REMINGTON it fit's all the criteria you mention, it sounds a bit vanilla but is one of my all-time favorites.
I almost got frostbite visiting Phoenix this weekend,I would bet Ft. Shaw MT. was much colder than that. good time to be building gun's inside rather than using them outside.
let us know what you decide on.
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
You make a strong case for the 6mm/223 and I'm hard-pressed to suggest anything better. Maybe the 6.8 Rem necked down to 6mm, or maybe a 7.62X39 necked to 6mm. Brass for that would be pretty abundant too.
Let us know what you decide on.
"Fenced yards ain't hole cards and like as not never will be, reason for rhymers and old five and dimers like me."
If the theory of evelution works as well as Kirby's catridge development; p-dogs, gophers & chiucks inhabiting north Central Montana should become nocturnal to avoid extinction. [img]/ubbthreads/images/graemlins/grin.gif[/img]
I see no reason to go with anything bigger than the 22PPC or 22BR. I 'd probably opt for a 9 twist just in case you decide to go with heavier bullets.
If you are hell bent on a .243 bore than I would still use either the PPC or BR case in the larger bore. The cost of brass is small compared to the $$$$$$ and effort that goes into building a custom rifle, Assuming that you don't abuse your cases with high pressure loads they will last for a looong time anyway.
How about a 6mmTCU? I have one in a 10" contender that will push a 70gr matchking 2650 to 2700 with 26gr blc2. I have thought about one in a small L469 Sako,22' barrel and light fg stock.Should be able to get 55gr blitzking's over 3000fps.BTW I built a small Sako a long time ago in .223 an it has been a dandy carry rifle and a perfect size for the small .223 size case.
I am getting to be a pretty big fan of the 6br. I havent gotten to shoot mine all that much but so far it has impressed me. BJ's 6mm-250 is a damn nice round, no recoil, good bbl life, and pin point accuracy!!! A 6-223 would be pretty slick and have great bbl life. I am still a big fan of the good ol 22-250 but you cant beat those 6mm bullets for ballistics.
i am sure you will make a good decision
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