Another look at finding the lands.

[ebb]

D4297 please explain to me why Tony's bullet and barrel is any different than Eric's.

 

[D-4297]

Actually, I disagree with your assessment “that most F class shooters jump their bullets”.
Dave

After reading your response , I thought , Okay . I'll take a quick survey . For three shooting sessions, I ask every shooter who was at BA that shoots any or all of three Disciplines of "F - Class " if they jumped their bullets in their loads . Only One didn't ; out of more than One Hundred shooters that said they did "jump" their bullets . Just a random , quick survey . But maybe it's just a commonality here at Ben Avery , for what-ever reason .

 

[D-4297]

D4297 please explain to me why Tony's bullet and barrel is any different than Eric's.

I guess the only answer that would make any sense is this . Why is your neighbor's car different than yours ? Barrels are like people . I've never seen two that were alike . I had a barrel that shot 185 Jugg OTM's lights out . Always high 190's and a decent X - count . My next barrel from the same manufacturer , same specs , same reamer , didn't shoot the OTM so well . But it shot the Jugg Target "really" well . That is why WE all have many different bullets , and barrels sitting on our shelves . I don't think there "IS" a explanation that answers the "WHY" of your question .

 

[Webster]

First, let me say that this thread is in no way to disparage Eric Cortina's method of tuning. He is too good of a shooter and his way works for him. However, when one becomes too dogmatic in their approach to a problem, they may encourage some resistance.

As an example, I will use short range shooter, Tony Boyer's method. I have interviewed Tony twice and this is his method of tuning. He told me that he does NOT jump bullets because he has found that those loads are inconsistent. He said that the jumped bullets may shoot small but the aggs suffer. Tony starts at "touch" with a given bullet and moves into the lands .003 at a time using three charges with each seating depth (mild, medium, and hot loads). When he finds a seating depth that not only shoots small but shoots to the same relative position on target with all three charges, he has found the ideal seating depth for that bullet and neck tension. Tony uses a lot of neck tension with N133 powder.

Eric is a great long range shooter and his method works for him, and Tony is the GREATEST short range shooter and his method certainly works for him. Good shooting......James PS-Tony added that he seldom chases the lands due to wear.

Don't feel like reviewing his book. I think Tony Boyer says he has about 8-9 thou neck thickness. How much tension do you get?

 

[ebb]

If I seat my bullets into the lands, they already have a head start at entering the rifling straight, they are there and they cannot get unstraight. If the jump they have all kinds of ways to enter the rifling crocked. I just don't see the advantage. I was taught when i first started reloading that was the first thing to do was figure out how long the OAL needed to be to be at or in the lands. I have all the respect in the world for Erik C but all of the shooters on the BR hall of fame can't be wrong.