Silent Sam said:
"One thing for sure you can't read it in fron a a TV!"
I read mine ON a TV.

.
I no longer have aTV. Well, no cable anyway. it's strictly for watching movies.
I think I understand what Pearce is trying to say. First off, you have to find a way to shoot the bullet and recover it without it's being all mangled up.
Then taking the bullets you want to test you have to measure the lube groove and record the number. After lubing, loading, shooting, recovering the bullet et al then you measure the lube groove again after cleaning it out of lube. if it has stayed the same or gotten smaller, no obturation and you'll have gas cutting. If the dimension has grown larger then you have obturation.
Leastways, that's how I interpret it. I remember reading where some guy tested for obturation by removing the barrel and shooting the gun that way. Muzzle blast certainly made the bullet's base get larger. I do rememebr the pictures that cam with the article.
Personally, and this is just my personal opinion but I think Scovill's method is not accurate. But then I met the man one day at the range. I'll leave it at that. I also wrote Handloader magazine about what I considered a serious error on their part. I did receive a non-too friendly reply from Scovill that it didn't matter. :shock: Oh really?
It had to do with an article on the .375/338 Wildcat. The drawing of the cartidge was the .375 Epstein. The two cartridges are exactly the same with one exception. The Epstein has a much longer neck and is made using .375 H&H brass which is run through the sizing die, then trimmed to the proper lenght and reamed either inside or outside, I forget which. If you stuck the Epstein into the .375/338 mag. and managed to get it to chamber, the results on firing would be spectacular and the shooter may be in need of an ambulance or maybe even the coronor.
I'd been shooting the round for over a year when that article came out and couldn't figure out why my brass was way too short according to the diagram. Then I thought, "Epstein", looked that article up and wrote my letter. I have had little respect for Scovill since that time.
Oh well, I hope my explanation cleared that up some. It was about I could figure out from what was in the article.
Paul B.