Originally Posted by Wash-ar15
I aheva couple of lead 147gr lead loads for IDPA. I have found that they just are not as accurate as lighter lead bullets pushing the same PF.
Any way to make them more accurate?
Go with a lighter projectile. If your gun is shooting the lighter projectiles better, it's telling you that it's barrel twist is set up for lighter projectiles.
If you're familiar with AR platforms, you'll see different twists for different weight projectiles. A heavier projectile will need a faster twist to get it stabilized. On the AR, a 1:8 works fine for the 55gr range; but you can get from 1:7 to 1:14 depending on what weight you plan to shoot most. Krieger feels that the optimum twist for the AR is 1:7.75, and they make that.
That's one reason the 22LR conversions have terrible accuracy (compared to a dedicated upper). A 36 gr 22LR projectile doesn't stabilize in a 1:8 twist barrel; it wants a 1:16 twist barrel (a slower twist). The dedicated upper can run the 1:16 twist for the 22LR.
Your other option, if you insist on 147gr projectiles, is to get a barrel with a faster twist than you currently have.