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Lands to bolt face ?

PostPosted: Fri Jan 02, 2015 4:20 pm
by White Oak 06
I got a gauge and comparator !

Lands to bolt = 2.674
Factory scirroccos 3006 150 gr. from ogive to rim = 2.584.
When I subtract I get 0.09.
Is this a 90 thousandths jump ?

Thank you !!

Re: Lands to bolt face ?

PostPosted: Fri Jan 02, 2015 7:21 pm
by saddaddykiller
i think .09 is 9hundreds of an inch ............ .0090 is 90 thousandths I think..........I may be wrong

Re: Lands to bolt face ?

PostPosted: Fri Jan 02, 2015 7:46 pm
by stickers
White Oak 06 wrote:I got a gauge and comparator !

Lands to bolt = 2.674
Factory scirroccos 3006 150 gr. from ogive to rim = 2.584.
When I subtract I get 0.09.
Is this a 90 thousandths jump ?

Thank you !!


Yes, I am willing to bet if you measure those factory loads that they will vary somewhat. I have seen boxes of Weatherbys vary almost 40/1000 . But yes, that is 90/1000.

Re: Lands to bolt face ?

PostPosted: Fri Jan 02, 2015 8:05 pm
by White Oak 06
I look at the powder and it's small spherical powder.
I seen some h 414 that looks like it
I see swift scirrocco reload calls for this powder for 150 gr. pushing 2900 +
and factory velocity is 2910 fps (muzzle )

I wonder if I were to reload this , I should start with this option ?

Other options called for 4350 and others.

This factory round is .5 sub moa at 100 yards.

This tipped bonded bullet leaves HUGE exits even with just rib bone with in 100 yards.
Don't remember what the charge weights were, I was thumbing through it.

Re: Lands to bolt face ?

PostPosted: Fri Jan 02, 2015 11:09 pm
by jv
0.9 = tenths
0.09 = hundred's
0.009 = thousands
0.0009 = ten thousands

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 8:06 am
by stickers
White Oak 06 wrote:I look at the powder and it's small spherical powder.
I seen some h 414 that looks like it
I see swift scirrocco reload calls for this powder for 150 gr. pushing 2900 +
and factory velocity is 2910 fps (muzzle )

I wonder if I were to reload this , I should start with this option ?

Other options called for 4350 and others.

This factory round is .5 sub moa at 100 yards.

This tipped bonded bullet leaves HUGE exits even with just rib bone with in 100 yards.
Don't remember what the charge weights were, I was thumbing through it.


Good place to start. However, factory powder charges are almost always a mix of 2 or more powders. No big deal though. If your gun likes the bullet then that is the most important thing. More than likely it will like it at whatever speed using whatever powder. Good luck.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 10:17 am
by White Oak 06
Jv , sdk , when I measure the jump for fed. power shok , it is lands to bolt = 2.674- 2.626 ogive to rim = 0.048" jump

I guess the calculator left out the zero for the first one and it threw me off and was trying to make sure .

The scirocco is a secant and the shok is tangent and the shok is seated closer to the lands and it is .5 moa like the scirocco .

One is tipped and boat tail and the other is a shorter soft point flat base, both 150 gr.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 10:36 am
by stickers
The secant bullet will be more sensitive to seating depth than the tangent

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 10:48 am
by White Oak 06
10-4
Ol boy at nosler a while back told me that secant is set closer and tangent is further back.
My measurements are just the opposite for these factory rounds .

Question ,
My calipers read 0.0000
Should I disregard the last digit when taking measurements ?

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 11:31 am
by jv
White Oak, have you ever goggled setting lands for reloading....there is some good info there and also a few video's on different sites that are very informative. I have not reloaded in over 20 years but been thinking of getting back into it. Will have to see if I can round up all my stuff, gave all my power and bullets to a friend that was reloading so I know I will have to replace that but everything else should be ok.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 12:36 pm
by White Oak 06
st_howprecisely_200809a-1.jpg
oalgaugeandbullet.jpg

I used this to measure from bolt to lands and it gave me an OAL of 2.674 "

and the comparator shown with the calipers the measures the ogive.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 3:37 pm
by saddaddykiller
jv wrote:0.9 = tenths
0.09 = hundred's
0.009 = thousands
0.0009 = ten thousands


so 90 thousands is .0009 right?

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 3:38 pm
by jv
The way i see it

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 3:53 pm
by saddaddykiller
I just looked it up and 90 thousands would be .090 .............but I don't understand that because aint .090 the same exact thing as .09? and .09 would be 9hundredth.........soooo confusing

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:05 pm
by White Oak 06
I used a calculator and it left off the zero and it read 0.09
When I wrote it out it was......
2.674 lands to bolt
- 2.584 ogive to cartridge rim
=0.090 thousandths jump

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:06 pm
by jv
jbullard or stickers might can give a little better insight on this

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:07 pm
by stickers
saddaddykiller wrote:I just looked it up and 90 thousands would be .090 .............but I don't understand that because aint .090 the same exact thing as .09? and .09 would be 9hundredth.........soooo confusing


Yes, they are the same but with handloading you are only dealing with thousanths of an inch .

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:12 pm
by saddaddykiller
so 9 hundredth and 90 thousandsths is the same exact size? wouldn't 90 thousandths be smaller than 9 hundredth?

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:17 pm
by jv
When I was reloading or should I say when I first started I would seat a bullet in the hull just a little and remove the firing pin and then I would try to see if the bolt would close (don't force it) then I would push the bullet down another 1000th and try it again and did this till the bolt would close then take a measurement and that what I set all bullets to. Right or wrong it worked. If you set the bullet to where it is touching the lands you will have a higher pressure then if it is a 1000th shy of the lands.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:19 pm
by jv
saddaddykiller wrote:so 9 hundredth and 90 thousandsths is the same exact size? wouldn't 90 thousandths be smaller than 9 hundredth?

9 thousandths will be smaller then 9 hundredths.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:49 pm
by terry08
I used to load my own many years ago. Weighed and cut grains with a razor blade for exact measurements. Tumbled all brass to look like new & sized all brass. Then one day I realized I was hunting, not shooting competition and although I loved it. For hunting I didn't need it. Just like the not so new Savage Axis, I have found the factory round it likes and don't believe I could get a tighter group with any handload. I now can spend twenty three bucks on a box of shells. And count on one deer per shell. If you enjoy the sport of loading, then continue on. But when you start questioning the equations you need to be careful.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 4:50 pm
by stickers
saddaddykiller wrote:so 9 hundredth and 90 thousandsths is the same exact size? wouldn't 90 thousandths be smaller than 9 hundredth?


No they are the same. Both = 9% is an easier way of looking at it.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 5:08 pm
by saddaddykiller
wut about 9 thousandth? is it the same as 9 hundredth and 90 thousandth ?

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 5:17 pm
by stickers
saddaddykiller wrote:wut about 9 thousandth? is it the same as 9 hundredth and 90 thousandth ?



No, it is less than either of those.

Re: Lands to bolt face ?

PostPosted: Sat Jan 03, 2015 5:34 pm
by saddaddykiller
well if u say it like this..............90 thousandths and 9 thousandth....u would think 90thousandth would be smaller than 9 thousands......that's where im confused.....cause if u had a same exact size pie and one pie had 90 thousand slices and one pie had 9 thousand slices , one slice from the 90 thousand slice pie would be smaller so u would think 90 thousands would be smaller than 9 thousands if that makes any sense?...I know u are right stickers but the way u can say the numbers is confusing