77 gr nosler bullet in 223

hunt127588":378ny391 said:

I use that bullet in a 7 twist. 23.2 gr of XBR 8208 gives me the best accuracy.

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greenheadcaller":2d6y72jk said:

Welcome 2frogs,

I too use XBR with 77 nosler custom comps without cannelure. For me, it's a great powder for that bullet and when reloaded responsibly, in my equipment, is not compressed loaded to AR mag length COALS.

Mag length in an AR is 2.26 max COAL (obviously measured at the tip), and if loaded to max COAL, mag issues can occur. These bullets vary a little above the ogive, as all do. So I determine average length and set up seating die to load them to 2.25 COAL to avoid issue. IF you are loading for an AR and intend to mag feed them, there it is. Note, with any rifle, even in an AR, first chamber a few, eject without firing, and inspect to make sure you aren't getting into the lands first. Now, if you want a measurement at the ogive at this point (under mag length coal at the tip) to avoid measurement variances above the ogive in the future, measure it using your measurement tool, and you have a ogive measurement number that means something for you.....but it only means something for this particular bullet, in your particular rifle, with your particular measurement tool.

Conversely, if you are loading these for a bolt rifle (I am not going to get into manually feeding an AR here). You MIGHT have room to go longer than 2.25 COAL (and whatever measurement at the ogive that gives you with your measurement tool).....and theoretically you might already be too long...it will depend on your rifle. Yes, I saw Wylde ... but they are aren't all cut the same either.

My point is .... respectfully, any ogive measurement I or anyone else may choose to give you to your question about ogive measurment is meaningless and should not be relied on, even roughly. We should assume our measurement tools are not exactly the same, and we should assume the bushings in our measurements tools are not exactly the same (which means we aren't catching the ogive at exactly the same spot).....even if our tools are sold by the same company. We should also assume our chambers are not cut the same (again, Wylde's are not all cut the same amongst those that class them this way, not even close), and distance to the lands are not the same. As we are dealing with exacting measurements of 100th's and 1000'ths, these differences make comparing my ogive measurement number to your ogive measurement number pretty much meaningless....and me loading to someone else's ogive measurements inadvisable .

My advise, if this isn't an auto loader, would be to first determine the distance to the lands in your rifle with your measurement tools, and stay well off the lands (a whole other chapter).

hope this helps, it was the intention

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2frogs":39abu802 said:

hunt127588":39abu802 said:

I use that bullet in a 7 twist. 23.2 gr of XBR 8208 gives me the best accuracy.

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WHAT DID YOU USE FOR AN OAL ?

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