.223 aol.

[nobody]

I was playing around today with my old model 12 .223. I started seating the bullets out longer. it seemed it shot 68 grain hornady match bullets over 25 grains of varget great seated at 2.260. I moved it out to 2.274 and it tighted up the groups even more. I shot four 5 shot groups at 200 yards with them seated out to 2.274 and they all ended up being about 1 inch. sub m.o.a. any way you shake it out. it was about 1 1/2 standard at 2.260.

does anybody else find that their .223 bolt gun shoots better with longer aol on their loads? next I might play with tuning the load and see what happens next. helps being able to walk out back and test loads. I can load 10 and test, then load 10 more!

[airb080]

Nice, I've noticed that my 243 likes my noslers about 15 thousands off the lands

Sent from my XT1585 using Tapatalk

[Texas10]

My model 12 .223 with 26 inch 9 twist barrel liked 69 grain SMK at .020 off the lands and IMR8208XBR. Good out to 750 yds.

Do you have the tools to measure Base to Ogive (BTOG) of your loaded rounds and Hornadays OAL gage to measure distance to the lands in your rifle?

With those two tools you can carefully test seating depth and be able to replicate it consistently, as well as chase the lands as the throat erodes.

[Robinhood]

You've got mail!

How did we get BTOG out of Base to ogive. BTO? You ain't seen nothing yet?

I better put down the beer.

[Texas10]

You've got mail!

How did we get BTOG out of Base to ogive. BTO? You ain't seen nothing yet?

I better put down the beer.

That's a good one!

For the OP's benefit, I've always seen it referred to as BTOG. Base to OGive. Otherwise someone might think we're talking about a Canadian rock group from the 70's.

[m12lrs]

I find that berger vld's and Lapua scentar L shoot best jammed in the rifling about 1 to 2 thousands

you can always use the berger method to find your best jump.

[Texas Solo]

I've always gotten best results when close to the lands, like -.005", when using VLD type bullets (mostly Berger VLD's and Hornady A Max)
But bullets with the "other" type ogive (SMK, Nosler Custom Comp) do best at -.020" +/-.

I think it's CBTO...cartridge base to ogive.

[SidecarFlip]

I was playing around today with my old model 12 .223. I started seating the bullets out longer. it seemed it shot 68 grain hornady match bullets over 25 grains of varget great seated at 2.260. I moved it out to 2.274 and it tighted up the groups even more. I shot four 5 shot groups at 200 yards with them seated out to 2.274 and they all ended up being about 1 inch. sub m.o.a. any way you shake it out. it was about 1 1/2 standard at 2.260.

does anybody else find that their .223 bolt gun shoots better with longer aol on their loads? next I might play with tuning the load and see what happens next. helps being able to walk out back and test loads. I can load 10 and test, then load 10 more!

Go invest in a Berger Reloading Manual and carefully read chapter 3 about CBTO, jump and determining the best jump for a particular projectile / firearm combination. I jump everything and it depends on how they group and is limited by magazine, feed ramp capabilities, unless you install an overlength (Wyatt) box.

Without getting into it here, once you determine the best (most consistently accurate jump), usually increasing the charge will tighten the groups even more. I just built loads for a 300 WM for a client and had them chronoing at over 3200 fps with no pressure signs or cratered primers, but backed them down to just over 3000 fps for the sake of barrel life... (with a 185 Berger VLD Hunting bullet in Nosler Brass). 3000 fps is still smoking for a 185 in a 300 WM. BTW, consistently shoots 1/2" groups at 200 yards and a ragged one hole at 100. Don't consider 100 yards viable for a hunting rifle anyway. 200 is a much better zero in my view.

[SidecarFlip]

I've always gotten best results when close to the lands, like -.005", when using VLD type bullets (mostly Berger VLD's and Hornady A Max)
But bullets with the "other" type ogive (SMK, Nosler Custom Comp) do best at -.020" +/-.

I think it's CBTO...cartridge base to ogive.

Exactly what it the measurement is. Cartridge base to ogive, measured with the appropriate gauge in your calipers (I use either the Hornady set or the gauge supploid with my Whdden die sets.

[SidecarFlip]

Never determine COAL from the tip if a bullet to the base, that only applies to a straight wall pistol round. Bottleneck rounds are entirely different.