Talking prairie dogs, you really do need a .223. It would be your main gun. But since you're talking 6mm.....
We were on the never-ending quest for a perfect prairie dog cartridge. Something that shoots flat enough to not need lots of scope adjustments. And since it's usually hot with lots of targets, the cartridge can't burn too much powder. More powder=more heat=less time between cooldowns. We settled on the 6mm-250, which is just a necked up 22-250....stupid simple to make. The 6XC you mentioned sounds good also, basically the same, just a 6-250 with less body taper. I don't have one, but do have 2 - 6/250's and can tell you about that. It shoots 55's faster than a 22-250 will shoot 55's. It pushes 65 and 70's a little less fast than a .243, but does it with 8-10gr less powder. For PD's, you don't want to mess with heavy bullets in that cartridge. Lighter bullets=less bearing surface=less friction=less heat and fouling. And, better blowups. Plus, I hate lobbing slow bullets at small targets. Here're some numbers to look at, taken from the way my guns are set up and shooting conditions you'd encounter.....6500' elevation, 90* temp. The velocities are approximate, but you'll get the idea. The Zero is 200yds.
These numbers are conservative, and the 90gr is just a guess...I don't shoot heavy bullets. You can see the light bullets shoot flatter, give up very little in a 10mph wind, and are sure gonna have a better splat factor. My guns see mostly 65's and 70's. I also shoot a couple .243AI's and a std .243, but the 6-250 is a better prairie dog gun. More shots between cooldown and cleaning, less heat, and less barrel fouling. One thing...prairie dogs at 600yds sounds good, but in reality most are 300yds and less. It's really not necessary to shoot them further unless you specifically want to. I like the 6-250 a whole lot, that's why there are two of them. My reamer has a .270" neck which is perfect for unturned PMC brass. I've made the stuff by necking up 22-250 cases, and necking down .250Savage...they both work just fine, but the .250 brass needs turning. Both guns have brakes and are just a joy to shoot. They go bang and don't even move.
Re: Questions & thought\'s on 6mm for BR and prarrie poodles.
If you are building this gun for prairie dogs,with a max range of 600yds.I agree with ACKMAN 100% a 12 twist with a 55gr. nosler with 35grs. of A2230 will get you 3900 FPS.in a 28" Krieger.
What you have to remember is time of flight is a big factor in wind drift,it's not just B.C.
The 6BR is one of my favorite rounds I currently have two of them and I have three reamers one for the 105's and one for the 55gr.with a .040 throat. and then the 6BR Dasher throated for the 105's.
The dasher reamer has not been used yet and I am gettting anxious to build myself a dasher for F class with McMillan new lowpro F-class stock,but that will have to wait until I finish two of my other gun projects.
My advice would be to either go with the 12 twist with the 55-70gr. bullets or go with the 8 twist with the 90-115's
the 10 twist does not give you the best of both worlds and if your going custom you may as well go for the best,
without God their is no hope for this country
Re: Questions & thought\'s on 6mm for BR and prarrie poodles.
I shoot the following for PD a 6mmrem 1/14twist,6br 1/14twist, two 6brtalldog both 1/14twist,three 6ppc 1/14 twist,6x284 1/14 twist, two 6mmremAI both 1/10 twist and a factory 243 and a custom. One caliber I would consider would be a 6x22-250AI with a 1/14 twist. For my type of PD hunting I like a 1/14 twist for 68/70 gr bullets in the 1/10 twist I use either 80 or 100gr bullets. I also like to have at least two rifles one for the close in stuff 300yd and another for the longer shots. I tried a 1/8 twist for those LVD bullets but didn't get along to well with it. I've had pretty good luck with the 6mmremAI using 80 and 100gr bullets. The Dasher and 6X have made a name for themselves using LVD bullets and I also think the 6x had about the right case capacity for the 600yd and Dasher for the 1000yd. The old 6Int (6x250) was done up in the 50's as a 300rd round for the Army and Rem made them for awhile in the 40x, Tubbs just reworked an old round that alot of varmit hunter used. A 243AI or 6remAI with a 1/12 twist using the 80/85 gr bullet would be a nice varmit round I don't think the case capacity of the 6x would work and the same with the Dasher case. The 6Br was always alittle over case capacity reason the short BR did so well so blowing it out to a Dasher worked good with the LVD bullets. Nice thing about the 243AI and 6AI is you can load them up or down. Beside the the 221,222 I like the 222AI,22br,223AI and 22-250AI. Well just my .02
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For the 6-250 or 6XC, slower twist is good...12 is about perfect for the bullet weights that work best on prairie dogs.
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Thanks for the info. Barrel heat was real problem last year. It took all day to shoot 500 round with cool down time. This year is going to be multiple guns and the 6XC or 6-250 appears to be the logical choice. I'm going to have to think about the bullet weight and twist.
I've shot 1000's of rounds through my old 22-250 It's a great gun for youngsters. The 223 has never impressed me. It and anything less than 22-250's are not real varmint guns. I'm not out shooting to save money. I'm taking plane flights and time off away from work and home.
.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
I'm not sure why you think .223's "...are not real varmint guns", but I assure you they are. A "real varmint gun" can be used with minimal heat buildup and fouling over a period of time. In many situations, a .223 is THE perfect cartridge...the go-to gun. With 40's and 50's, a .223 will blow the crap out of small varmints in a very "real" way, and also pretty well mess up a rockchuck. The 22-250? I mostly shoot the AI version anymore, and it'll just demolish those same small critters and gutpile a rockchuck....after a day of shooting, the rocks look like they've been splattered with red paintballs. The .17AH, .17MIV, and .221 are all smaller than a .223, and they're "real varmint guns" too. The 223AI, 22/6BR, 6-250, .243AI, and larger stuff are all "real varmint guns". But a .223 is one of the very most useful and basic to any varmint hunter's arsenal.
You never know what the conditions will be. For several days of shooting, it's nice to have 7 or 8 guns.
Used to think the same thing about the 223.It is now the round of choice for most shots inside of 300yards.The 8 twist 22-250 shootin 75grain Amaxes gets me to 500yards where the 6-284 with 105s takes over to 800 or so then the 6.5-284 is called to duty.
Noise as well as heat favor the smallest round possible.You can shoot a lot of 22lr and not spook the dogs much but fire one BMG round and every dog for miles heads for cover.
Nothin against the 6/22-250(or whatever you want to call it) but its not a huge difference little of witch can be noticed by a prairie dog.
Early season the pups realy go to pieces with a 40 grain Vmax out of the 223 but twards fall with a little weight put on it seams to take a bigger chunk of lead to tearemup.
The best red mist I can recall came from the plain old 243 with 55 grain Nos over 4000fps,the scope would turn red and small chunks would fall back though the view(makes some great vidio!)Unfortunatly it was only minute of prairie dog to 200 yards but fun all the same.Still havent tryed the 375/50BMGsecsessfully yet but at 4450fps with a 260grain Nosler it aught to killem just fine [img]/ubbthreads/images/graemlins/wink.gif[/img]
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anything less than 22-250's are not real varmint guns
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Just couldnt limit my options that much!
__________________ "Make everything as simple as possible, but not simpler." -Albert Einstein (1879-1955)