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need help with caliber choice

 
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  #1  
Old 06-05-2006, 09:07 PM
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need help with caliber choice

i came across a pacnor 6mm 1x7twist blank about 31" long I am wanting to build another prarie dog rifle but i am having a problem coming up with a caliber . i would like barrel life to be in the 1200-1500 rnd range if possible and would also like to be able to break 1500 yds with it i was thinking about a 6mm rem imp. but would be open to anything also feeding is not a problem because it will be a single shot

i would appreciate any input good or bad on any caliber
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Old 06-05-2006, 09:28 PM
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Re: need help with caliber choice

I would lean more towards either a 6-06 AI or 6-284 just to take advantage of the Lapua brass. I think most would agree that brass would outlast your barrel instead of the other way around, and it would cut down on the fire-forming. I think they would all be pretty close to ballistic twins with 115 DTACs. Good luck with whatever you choose!
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Old 06-06-2006, 04:29 AM
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Re: need help with caliber choice

for that kind of range I would agree that the bigger cased 6-284 and 6-06Ai would great choices you have the right twist for the 115 clsss VLD bullets.

Now I'm not saying that their arn't others , I'm sure the 243Ai would get you out their with the right bullets just a little slower , hell the 6XC probably would also and both of these would give you better barrel life.

Personaly I'd hold onto that tube and get another in at least 6.5 or 7mm for those kind of ranges
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Old 06-06-2006, 05:20 AM
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Re: need help with caliber choice

The 240 Wby has about the same case capacity as the 6-06 and 6-284 and fits the same bolt face and will deliver the same performance. Norma brass is readily available. 6-06AI is probably a little more case capacity and some small amount more velocity with a heavy bullet and long barrel.
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Old 06-06-2006, 07:04 AM
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Re: need help with caliber choice

Brian,
how many lands does the barrel have ????? if it is a 3 groove it limits your choices of bullets and chambers. I have a Pac-Nor 1-8" 3groove chambered in 6-284 and the ONLY bullet I can shoot out of it with out blowing up is the 107gr SMK. on the bright side it shoots very well as I have shot rockchucks out to 1515yds with it, but 1500 rounds is not going to happen in a 6-284 mabey a 6-250 Imp.
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Old 06-06-2006, 08:10 AM
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Re: need help with caliber choice

I would go with a 6mm-284 and have fun with 115s if you want to be practical. My next hotrod will be a 6mm-264 winchester magnum with a 1in7 heavy barrel, should move 6mm 115s out pretty damn quick. [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 06-06-2006, 08:41 AM
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Re: need help with caliber choice

Brian,

That is a pretty extreme twist. When dealing with a 1-7 you will have to consider that high velocity will in most cases destroy the heavy 6mm bullets on the market today.

I have a 3 groove Lilja 1-8 chambered in 6-284. It will destroy any bullet except the 107 gr SMK at velocities above 3300 fps. With the SMK it will push up to +3500 fps but only with this bullet.

I would be suprised if any 115 gr bullet will handle this twist much over 3100 fps and stay accurate.

You may want to consider a 6-250 or 6-250 Imp as Uncle B suggested.

Just trying to save you some time and money, don;t think you can drive a 115 gr bullet to really high velocites in this 1-7 twist because the bullets simply will not handle it.

I would bet that even a 6-284 would be hard on the 115 gr pills in this barrel.

My standard barrel twist for a 6-284 designed to shoot the 105 to 107 gr match bullets is a 1-9 twist 6 groove. Just to put it into perspective.

If you have not already bought the barrel I would not get it. Get a 1-9 twist, chamber it for a 6-284 and shoot the 107 gr SMK at +3500 fps. YOu will get all the performance you need and a much less finicky rifle. You will probably even be able to use the 105 gr A-Max at nearly this same velocity with this barrel and they will perform much better terminally then a SMK will because they are tipped and expansion will be much more dramatic.

Just an opinion.

Kirby Allen(50)
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