COL Results

Ok, I asked a question from a previous post http://forum.hunting.net/asppg/tm.asp?m=1071841

and finally found out for myself. got my stoney point back. Since it didn't seem too many people ever tried it before.

I was trying to find out how much more you jam a bullet up in the rifling compared to a stoney Point AOL tool. I measured three different bullets using the split case and the stoney point. Measured at the ogive with comparitor and tip. What I found is, you usually jam the bullet up in the rifling .003 to .005" using the split case method. Using felt tip was so inconclusive and cluncky, its a waste of time.

I didn't do this so much for accuacy but was confused that the throat was so short on this particular gun. One thing I learned is using the split case, you can get real good accuate results and keep in mind you are jamming the bullet in some.

Caliber 7mm08 using stoney point comparitor
Stoney AOL Split Case
Bullet 1 3.255" 3.258"
Bullet 2 3.255" 3.259"
Bullet 3 3.254" 3.257"

Using COL and calibers
Stoney AOL Split Case
Bullet 1 2.745" 2.750"
Bullet 2 2.739" 2.748"
Bullet 3 2.744" 2.248"

[Mr. Longbeard]

bc thanks for posting that. I will be trying the split case method tomorrow. I will be taking this info into concideration...

Remember to split the neck after resizing and only enough where you can push the bullet in by hand with some effort. You might have to take a pair of vise grips with plastic covers to pull the bullet out. You want it tight enough so it stays in place when removing the shell.

[Mr. Longbeard]

BC I just got finished trying the sc method. I did ten test... This is what I got...

2.954
2.957
2.974
2.957
2.959
2.959
3.007
2.955
2.958
2.957

My gauge I made was loose enough for me to pull the bullet out by hand. A few times the bullet would be pulled out by the rifeling. I disregarded those mesurements....

I might try again but this time make the gauge a little tighter. I was affraid that it would push the bullet into the rifling to hard and give me a false reading. That is why i made the gauge a little losser...

[Mr. Longbeard]

I decided to split another case and this time make it a little tighter. This time I got more consitent mesurments... I took 6 trys and this is what I got...

2.959
2.960
2.958
2.958
2.958
2.958

Now how far should I back off the rifling????

[mossy33oak]

ORIGINAL: Mr. Longbeard

2.959
2.960
2.958
2.958
2.958
2.958

Now how far should I back off the rifling????

I'd start at somewhere between 2.94 and 2.92 I try to stay with .030 as a guideline so.......2.928 is what I would shoot for.

[Mr. Longbeard]

Thanks Mossy.

Yea, moss got it right. I would shoot for 2.94 to be safe. And you probably don't have a comparitor. That way you can accomidate diff bullet lengths of the same bullet.

[Mr. Longbeard]

What is a comparitor????

[mossy33oak]

ORIGINAL: Mr. Longbeard

What is a comparitor????

basically a thing that screws onto the top blade of your calipers and allows you to get a measurement from the ogive of the bullet as opposed to measuring from the tip where measurements can be inaccurate (especially with leadtipped bullets)

checkout a company called Stoney Point , they have the items you have heard mentioned here lately (the comparitor, the OAL guage etc) I have recently switched to all plastic tipped bullets, so I find myself using the comparitor less and less. The Nolser line of bullets seem to be right on the money 99% of the time.