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Short barrel ballistics

 
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  #1  
Old 02-25-2011, 08:40 PM
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Join Date: Jan 2011
Location: PA
Posts: 36
Short barrel ballistics

Both of my rifles are carbines with 18 1/2" barrels. The first is a Rem 788 in .243 my father bought new in 1980 as a truck gun when we farmed. We went to Oklahoma that year(1980) prarie dog hunting. I know it will reach out there because he was shooting them out past 500 yds with it sporting an old Weaver 10X target scope.

My other rifle is a Rem Model Seven in .308 Win. I bought it to be my mountain gun for white tails here in PA. I bought it tin 1997 new and love it because its so light and easy to carry.

My question is how much velocity am I giving up compared to th 24" barrels? I have shot under two deer in the last couple of years that were out at 200-250 yards with my .308. I didn't think I would need any holdover looking at the ballistics charts, but evidently the short barrel is affecting the .308 more than the .243. I shoot 168gr Barnes XLCBT with 44gr of Accurate 2230, this is supposed to give 3090 fps out of a 24" barrel. I have also used H4895, but don't get as good of accuracy. My Data is right from Barnes and is the max load with no pressure signs.

Thanks,
Chris
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  #2  
Old 02-25-2011, 08:45 PM
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Location: Cheyenne
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Re: Short barrel ballistics

At least one guy on SH shoots his 18" 308 at 1000 yards, so there's no reason you can't kill a deer at 250.

YouTube - 18" Barrel to 1000 yards

Create an accurate ballistics table (with the real MV, not supposed) and you should have no problem.
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  #3  
Old 02-25-2011, 09:47 PM
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Re: Short barrel ballistics

Does a faster burning powder have less difference since it will completely burn in the shorter barrel? I dont have a chrono or long distance range. Eventually I will get a chrono.
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  #4  
Old 02-25-2011, 10:00 PM
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Re: Short barrel ballistics

A faster powder will certainly be better suited to your 18" barrel than a slower powder. However, with that said, Hodgdon lists some 308 pistol loads with Varget and 4895, both of which are slower than your 2230.

I guess what I'm getting at is this: What you're using will probably work just fine. You just need to learn its trajectory, build an accurate dope card, validate the predicted drop, and go from there.
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  #5  
Old 02-26-2011, 12:25 AM
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Join Date: Jun 2007
Location: Wyoming
Posts: 2,671
Re: Short barrel ballistics

Since I do not have any rifles, all of my LR rigs are single-shot specialty handguns with barrels from 15 inches to just under 18 inches.
I have chamberings from the 223 Rem. to the 338 Lapua Improved (338 AX).
I routinely shoot out to 1200 yards on steel with these handguns, and sometimes further.
I would would guesstimate about 40 fps per inch,but 35 fps per inch may be closer. I assume I will lose about 300 fps compared to typical rifle lengths.
I do not use the faster powders.
Example
6-284 with 115 DTACs - H-4831sc
6.5-284 H-4350 (140 VLD's) and sometimes Hybrid 100V
284 Win (140 NBT) H-4831sc
7mm Rem Mag Imp (180 JLK) H-1000
6.5 WSM (130 Berger) H-1000
7mm Dakota (200 gr. Wildcat) Retumbo
338 AX Retumbo (300 grain SMK or Berger)
7mm SAUM H-1000 (162 A-Max)

Quote:
Originally Posted by CLP308 View Post
Both of my rifles are carbines with 18 1/2" barrels. The first is a Rem 788 in .243 my father bought new in 1980 as a truck gun when we farmed. We went to Oklahoma that year(1980) prairie dog hunting. I know it will reach out there because he was shooting them out past 500 yds with it sporting an old Weaver 10X target scope.

My other rifle is a Rem Model Seven in .308 Win. I bought it to be my mountain gun for white tails here in PA. I bought it tin 1997 new and love it because its so light and easy to carry.

My question is how much velocity am I giving up compared to th 24" barrels? I have shot under two deer in the last couple of years that were out at 200-250 yards with my .308. I didn't think I would need any holdover looking at the ballistics charts, but evidently the short barrel is affecting the .308 more than the .243. I shoot 168gr Barnes XLCBT with 44gr of Accurate 2230, this is supposed to give 3090 fps out of a 24" barrel. I have also used H4895, but don't get as good of accuracy. My Data is right from Barnes and is the max load with no pressure signs.

Thanks,
Chris
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  #6  
Old 02-26-2011, 11:45 AM
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Join Date: Jan 2011
Location: PA
Posts: 36
Re: Short barrel ballistics

I looked back through my load notes and I was mistaken. The load I shot under with was 42 gr of H4895for a published velocity of 2750. I'm new to this long range thing but am looking at buying an old BDL my local shop has in .264 Win Mag.$500 bucks and the ser # puts it in the mid '60s. Or would I be better off with a newer gun in 7 Mag? Im kinda drawn to old/differrent guns.
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  #7  
Old 02-26-2011, 12:11 PM
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Location: Central Pennsylvania
Posts: 4,029
Re: Short barrel ballistics

I'm shooting 178 and 175 BTHP's right around 2500fps in my 18". Haven't really found a holy grail of powders to improve on that. I am currently using IMR4895. Seems to work pretty good.

Tank
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