Ogive Length Sorting

[Hi-NV Shooter]

Lee,
What many may not fully appreciate is that while you are not wrong, much of this is chamber depth/barrel configuration dependent with MI barrels requiring certain ranges of OAL.
Recall, a while back, the WLM was droning on about ELEY posting OAL numbers with their lots, especially if he chambered for good but short OAL, and you then try stuff .010” longer. More than a few of those guns had issues when the ideal lot was used up.Carbon fouling rates change substantially as a for instance.
Some guys still chamber short, some long, some sharp ones cut a mid depth chamber and then adjust as they test to see how fast leade fouling develops.
My guns, for instance seem to have a “mid depth“ chamber….. more tolerant of OAL variances, which when I shot mostly ELEY, did a fair amount of testing in this regard after I got a proper measurement gauge .

I agree, different barrels will need different chamber depth. I had recently a BM 3G that had a bore tighter than I ever came across. using the regular 0.075 stick out for the depth didn't work it gave too much engraving. consulting with Kevin, I had my smith go another 0.035 deeper and now the barrel shoots really good and I actually won my first ARA with it.
everything I am doing is based on what Kevin wrote about on what he found to optimize shooting Lapua.
8 years ago, I had the barrel on that rifle that shot the example target re-chambered based on what Kevin wrote and also what I read about how the late Bill Myers chambered his barrels.
as far as checking OAL, I know it only helps. I found why fliers occurred and how to weed them out from a lot. I think now with the almost zero ability to find ammo this is even more important.

Lee

 

[TRSR8]

The BM’s can occasionally be wild, Years back Myers built me a Hall Sporter with a 17 3/4” twist 2gr that was .215” in the bore….talk about tight.
Again, the OAL deal on “ some “ barrels. That’s when everybody was going nuts about slower twists and ultimately believed they were unstable in cold temps.
We believed it never was that but lots of those BM 2 groovers were not round in the bore, very tough to do with a 2gr barrel. Try lobbing an oblong slug @ 50 yards.
I believe the last barrel Gordon E ever fit was a Muller 5gr for me as a favor and when I was testing it I ran some groups with couple lots of ELEY that varied by .008” ……..went right into same hole. His chambers were usually right about to 2nd drive band. Seem to handle a lot pretty well.