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Old January 21, 2013, 09:27 PM   #3
LE-28
Senior Member
 
Join Date: September 24, 2012
Location: North Carolina
Posts: 759
The rifling twist of your barrel sound right, that's what most 243s barrels are.
How mush freebore are you giving your bullets? That gun should do better than a 2"group at 100yds.

The 4350 should be ok also, I load my 243s at 40gr of IMR4350 with 100gr Hornady bullets and they were tack drivers, litterally. These were both 20"barrels but the fact that your barrel is shorter should have no bearing on the accuracy, just a little on the velocity side.

It's always been my understanding that the powder is all burnt in the first 2-3"of the barrel and the extra length just gives the pressure a longer period of time to interact with on the bullet to gain velocity.

Try to get the bullet out to about .005" from the lands of the riflings.
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