Leade angle

D

Donald

Guest
In short range BR most of the reamers/chambers have a 1.5 degree per side leade angle. I would like to learn of anyones experience in going with a bit steaper angle, say 2 or 3 degrees per side. Anyone using anything more than 1.5 per side?

Donald
 
Donald ...

A suggestion. Call Dave Kiff at Pacific Tool & Gauge at 541-826-5808 PST and ask him what percentage of 6PPC reamers he ships with leade angles greater than 1.5 degrees. That should get you in the ballpark. Art
 
abintx,
I already have and he said most are still using the 1.5 leade. Especially one that he mentioned was Tony B. I know that 1.5 is the most requested, but was just wondering about other leade angles. I think some of the long range shooters are using 3 degree. Don't know if this is better, as good or worse. Seems like a 3 degree leade would allow bullet contact with the lands nearer the ogive of the bullet and resist flame wash out a bit better. Just curious. Any ideas out there.

Donald
 
Donald..The long range shooters are trying to match the long ogive of the VLD type bullets which will also allow for a shorter freebore and they many times "jump" their bullets into the lands, so I would think the longer less abrupt angle would be better choice for the long range shooter..
The short range shooters shoot more of the stubbier ogive bullets with the double radius..and want to use the lands and grooves to align the bullet (i.e. "jam")...So each application has is different...
You could try the 3 degree lead and report what you find...;)
 
My 30-30 Reamer

I ground it with a 2.5 degree throat. I didn't do this because I felt it would be more accurate. It's just that after checking the seating depth with a test stub piece of barrel, I wanted to shorten the throat a tad more. I decided to increase the throat angle just to see how it would work out. Apparently it shoots fine.

Michael
 
After 100 or more firings what do you think the lead angle will be, on any chambering. I doubt it could be measured.
 
Donald said:
In short range BR most of the reamers/chambers have a 1.5 degree per side leade angle. I would like to learn of anyones experience in going with a bit steaper angle, say 2 or 3 degrees per side. Anyone using anything more than 1.5 per side?

Donald
Click to expand...
I use a 2-degree half-cone angle (4-degrees included). Shoots fine. I got this reamer print from Jeff Summers; I don't think he uses it anymore. With the 2-degree throat angle, I used a .090 freebore, which is fine for bullets like the Fowler 66's. Surprisingly, It also seems to work fine with 67.5 grain BIBs, which have an 8-1/2 ogive. I can even seat the 62-grain Fowlers on the .750 jacket, but not a lot of the bullet is in the neck with that .090 freebore.

Jeff also had used a reamer with a 3-degree half-cone angle (6 degrees included). As I remember, he said it could shoot well, but was somewhat fussy.

Very small sample size, YMMV.
 
A few years back I was in the process of getting a new 6PPC reamer and I asked Tony Boyer what he was using at the time. He told me that he had switched to 1/2 degree. I don't know if he was pulling my leg or not. I went with the conventional 1 1/2 degrees. I didn't win any more matches than I did before, while TB kept winning as per usual. Maybe I shoulda switched.:rolleyes:

Ray
 
One of the reasons I asked this question was that my reamer has a 3 degree/ side leade. 0.060 free bore and .268 neck. I can turn brass in one pass, which is nice. But have the feeling that the 3 degree/side leade may be fussy. I had a couple of barrels that had been chambered with a 1.5 degree lead and .262 neck. One a Kreiger and one a Bartlein. They both shot good. I recut both with the new .268 neck reamer and now have two Shilens, one canted land, that is chambered with the 3 degree/.268 neck and they do not shoot to my expectations. Very well could be the shooter too. Can't really see that the difference between 1.5 and 3.0 should be much, but then don't really know either. 66 Fowlers, 68 Cheeks and Gentner 65BT all seat about 1/2 down the neck. When I ordered it I should probably have listened to Dave Kiff. He said all the big time shooters, including Tony, were still using the 1.5/side. That was last fall. Got one more new Shilen blank left, maybe a new barrel will be better. Not real happy with the canted land. It has a tuner on it and I can tune out the verticle pretty easy but seems it needs a slight readjustmet each time I shoot it. My old Bartlein with a tuner on it seems to still shoot good with about 850 rounds thru it. Lots of unanswered questions.....:(

Donald
 
Donald said:
One of the reasons I asked this question was that my reamer has a 3 degree/ side leade. 0.060 free bore and .268 neck. I can turn brass in one pass, which is nice. But have the feeling that the 3 degree/side leade may be fussy. I had a couple of barrels that had been chambered with a 1.5 degree lead and .262 neck. One a Kreiger and one a Bartlein. They both shot good. I recut both with the new .268 neck reamer and now have two Shilens, one canted land, that is chambered with the 3 degree/.268 neck and they do not shoot to my expectations. Lots of unanswered questions.....:(

Donald
Click to expand...
Donald, somewhere on this site not long ago , can't remember which forum, there was a discussion by someone, I think Henry Childs, where they had done quite a bit of testing?? I hunted for a while but couldn't find it. Henry is HBC on this site.

As to the difference between 1.5 and 3 degrees/side, other than the bullet making a slight change in case capacity, I'll bet you will be hard pressed to see a difference.
 
Thanks Jerry, that is kind of what I was wanting to hear. I can't see that it would make any difference either other than seating depth on the bullet.
 
Leade Angle

Dan Lilja wrote an extensive report on leade angle and twist.
It had extensive information . many formulas etc. In the final analysis
the 1.5 degree was just about right. I would ask Dan about this.
also i don't think leade angle has much to do with freebore {the removal of rifling} I believe that has more to do with bullet length.
 
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Ray:
Me thinks ya should have listened to Tony. most of the in the know LR 1k shooters are using the 1/2 degree leade, wears faster but the tendancy to get a bit of bad TIR is eliminated if you use the in the leade bullet seating.

Clarence
 
Ditto what Clarence said, the move right now in Palma shooting (.308) is to the 0.5 degree leade angle. I have a couple of barrel like this and have been satisfied with the results. Of course, shooting a 155 gr. .308 at 1000 yards, it's a lot harder to quantify results than it is in Benchrest, so I can't offer any hard and fast data. It is certainly no worse and likely better based on scores fired so far (about 1500 rounds).
 
Thanks for posting dans write up. That should give the straight answer.
Gerry
 
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