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Getting 243 AI But Which Twist Rate

 
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  #1  
Old 02-20-2008, 09:37 AM
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Getting 243 AI But Which Twist Rate

I was think about getting 1:8 twist and was going to shoot DAC 115gr or 107gr SMK but with 1:8 what would be the lightest bullet I could shoot?

Also what would be better 26", 28" or 30" barrel. I heard there is not much difference in fps between 26 to 30. Is that true? I am just starting out and reading as much as I can to learn.

Thanks

Mike
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Old 02-20-2008, 10:08 AM
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Mike you can shoot the 55gr Nosler ballistic tips out of a 243 Ackley with a 1-8 faster than the bullets can stand , mine I could get right to 4000fps before they would blow up , I had better accuracy with the 75gr V-max at the 3700-3800 fps range than the 55gr bullets though. I think that the 1-8 is the best twist for that case as it allows you to use about every bullet out their.
As for the barrels I'd get the longest barrel you can , if you get a heavier barrel with the long 4"-5" shank that will allow you to cut a couple inches off the rear end and rechamber after the throat gets worn.
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Old 02-21-2008, 12:13 PM
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I'm getting mine built with a 1/8 Broughton 5c. I am going to shoot the 105gr Bergers, and probably the 87gr V-max, maybe the 75's also. It should be done it about 2 months, so I'll post what I find out.
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Old 02-21-2008, 03:55 PM
JLR JLR is offline
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All the ones we've built recently have had 1/8. The only one that has a problem shooting lighter bullets is one Lilja....it likes to eat the 87gr V-max. The other Lilja, Krieger, and Broughton all shoot the small bullets just fine. We've recently pushed the 62gr Varmint Grenades over 4000fps through the Broughton. They all seem to really like the 105 Bergers though.
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Old 02-22-2008, 09:22 PM
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Quote:
Originally Posted by toyotasaurus View Post
All the ones we've built recently have had 1/8. The only one that has a problem shooting lighter bullets is one Lilja....it likes to eat the 87gr V-max. The other Lilja, Krieger, and Broughton all shoot the small bullets just fine. We've recently pushed the 62gr Varmint Grenades over 4000fps through the Broughton. They all seem to really like the 105 Bergers though.
The reason that your one Lilja is "eating 87gr V- Max" is most likely because it is a three groove barrel (if you want to really see bullet blow up try the 105 A-Max in this same barrel).
The Krieger is most likely a 4 groove and most of the Broughton 6mm barrel's I have seen have been 5 groove barrels.
IMHO with a 1-8" twist in a .243 barrel with this much case capacity, I will never use any thing other than a 5 or 6 groove barrel again.
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Old 02-22-2008, 11:53 PM
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uncleB, I agree with your conclusion, but it's only one of the two Lilja's we have that eats the 87's. Odly enough, we actually use the 105 A-maxes for fire-form loads and they shoot pinholes out of that same barrel. Don't think TMR has tried to push them out of a formed Ackley round though.
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Old 02-23-2008, 10:34 AM
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mjbine,

If you go with anything other than a 3 groove barrel in the 1-8 twist, you should be able to use the lighter bullets. My Lilja barrel has a pretty tight bore and most of the 87 gr bullets don't make it to the target, and the ones that do....well, I could throw them more accurately. Put a 105gr berger in that barrel and it shoots in the .2's all day long. My fiance's Lilja shoots all bullets, but it also takes about 2 grs more powder to get the same velocity. The Kriegers we have seem to shoot any bullet, and the Broughton is extremely happy with anything that you feed it. Like my brother said, we had the 62gr Varmit Grenades shooting at almost 4100fps and the shot around a 1/4" group at 100yds. As far as the longer barrel.....my dad has a 26" barrel on his and gets about 75fps less than our 27.5"-28" barrels. After playing with this last broughton, I would like to get a 30" to test. I am running the 105's at 3300 out of a 27.5" barrel and have not hit max load yet....you can actually load another bullet and put it right back into the chamber.

I think the barrel length depends on what your overall goal for the rifle is. If it is going to be on the bench shooting targets or varmits, then definitely a 30". If you want it more portable, then I would go with 27-28" varmit contour. The 243AI is a great round with the new VLD style bullets.
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