45 cal knurling saboted

[deadon]

Who has found that knurling the 195 gr barnes or the 200gr SST so it does not slip in the sabot has improved accuracy and consistency? Thanks in advance, Rusty

[dave d.]

:)rusty I asked this question on another thread I'm just wondering how you would know firing a sabots bullet if it slips. I have not knurled any of my bullets and they are accurate so I don't understand. Maybe some more knowledgeable guys could let me know what the signs of a slipped bullet are.

[youp50]

Now you you are talking a different animal.

The Edge has stated before, a bullet not spinning or slipping in the sabot will drill the sabot. Or come out the bottom of the sabot. Knurling is used to increase the diameter of the bullet for a tighter fit.

It makes sense to me.

And so does the bullet is slipping a little , not enough to drill, but enough to not properly stabilize.

I do not know the mechanics, only the results.

[edge]

I don't think that it can slip and not drill the sabot, but a knurled bullet may not drill the sabot because it didn't slip in the first place

edge.

[dave d.]

oooh yea now I remember. I must have been having a senior moment ;D. Yes drilling was the culprit. Thanks

[deadon]

what does a drilled sabot look like?

[pposey]

Well a couple of things I have noticed with my Encore Conversion, 58 Grains H4198 and the 200xtp and 195 barnes flat base. and Harv smooth blue. after knurling,,,

First groups went from 1.5-1 moa with some flyers at 2 moa to cloverleafs and one raggity hole groups,,

2nd, The sabots look better,,, unknurled the sabot petals were really thin and stretched, stretched to where they were see through,,, now they are not stretched and you can see where the knurling bites in,,, here is the file I am using and knurled bullet

cid-86f11e537cb9c8bf.photos.live.com/self.aspx/TC%20Encore%20SMI%20conversion/036.JPG

another photo on that link shows a bunch of the groups I was getting pre knurled and one with knurling,,, the knurled groups have stayed the same, nice and tight!

Without knurling the Encore was real picky about shooting clean vs dirty,,, I have not noticed that with knurling but have only shot 20 shots or so knurled,,, shot 120 or so unknurled.

[rangeball]

Feb 11, 2011 10:39:45 GMT -5 deadon said:

what does a drilled sabot look like?

Hole in the base. Like this one, although it's from a shotgun sabot-

[edge]

Here is another one:



from: www.gunweek.com/2004/feature0610.html

edge.

[bteague]

In my encore conversion I have to knurl.I do it for Acuracy.I
Have never drilled a sabot.Billy

[deadeye]

when i was shooting sabots i put a cannelure on the bullet & it always left a track for slippage insurance

[Dave W]

My barrel is on the loose side compared to the majority of the Pacs. Without knurling, the 195 BX was not very good. With knurling, turned into a MOA or less gun.

[dannoboone]

The first batch of 195gr BX shot pretty good out of my PN .45, right
at MOA. The next package shot 3 1/2-4 MOA using the same loads
from the same bottles of powder (duplex) and the same package
of Harvester blue sabots. The 200gr SST's were still shooting MOA.

?? ??

On the way back home, it occurred to me to measure the diameters
of the bullets. Sure enough, they were inconsistent. Some were
.400 at the base, .399 at the ogive, and visa versa on other
bullets. Knurling evened them up, and I later found that knurling
the whole bearing surface to right at .4005 made some 1/2MOA
groups from my barrel. I haven't tried knurling the 200SST's
because they all measured .400 the entire bearing surface of
those I measured.

[Chris Champion]

My 45 pacnor barrel prefers knurled bullets in sabots. It doesn't make much of a difference at 100yds but at 200 + I can tell a difference. When I first shot the new flat based 195 Barnes I thought my knurling days were over. Once I stretched the distance out my accuracy suffered without knurling. My barrel is in the .450-.451 range land to land.

[ratsnakeboogy]

How do you stay consistent knurling bullets? Do you count the number of rotations, measure frequently, or what?