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Bullet Baring Surface- How Do You Measure It ??

 
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  #1  
Old 11-23-2007, 04:31 AM
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Bullet Baring Surface- How Do You Measure It ??

Just about to start getting real serious about loading a consistantly accurate round for my 338. I was told that measuring the projectiles baring surface was important so I just want to get clear how best to do it ?? Where are the measurements taken from exactly ??

Thanks all !

DUH
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Old 11-23-2007, 04:59 AM
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Bullet bearing surface

Get yerself two identical Stony Point or Davidson comparator nosepieces for the caliber you want. Attach them to a caliper. One goes over the bullet point, other over the bullet base. Slide your caliper and measure, sorting bullets into groups. Cull out bullets having the widest discrepancy.
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Old 11-23-2007, 11:31 AM
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dnundr;

Shoot it straight up, really straight, catch it in a bucket on the way down then measure the length of the marks.

What Gene said is a bit better.;)

If you're in a hurry set your caliper to the Bore size and slip it over the ogive and make a mark. To make the mark just turn the bullet slightly in the caliper. Slip it over the base and make a mark. A PITA but will do if in a hurry or are impatient waiting the stoney point order to arrive.

I use a sinclair gizmo that looks like a hex nut. and insert the bullet both ways. Not as good, easy or as fast as the stoney point method though.
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Old 11-25-2007, 05:37 AM
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Roy and Gene,

Thanks for the handy tip. I'll buy one straight away !

Thanks boys !

DUH
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Old 11-25-2007, 05:52 AM
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PS-- Can anyone give me a link to a 338 cal Stoney Point bullet comparator please so I can order one.

Many thanks

DUH
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Old 11-25-2007, 10:00 AM
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Stoney point was purchased by Hornady not too long ago.

You will need 2 of these MidwayUSA - Hornady Lock-N-Load Bullet Comparator Insert 338 Diameter

and 2 of these
MidwayUSA - Hornady Lock-N-Load Bullet Comparator Body

A good digital caliper makes using these very quick and accurate.

Instead, I purchased the headspace kit and the comparator kit, so I could measure all calibers etc. The headspace kit comes with a .330 insert, so measuring the baring surface for 338 can be done without a second .338 insert. The .338 insert is actually .330 and is marked as such.

MidwayUSA - Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator
MidwayUSA - Hornady Lock-N-Load Bullet Comparator Complete Set with 14 Inserts



AJ
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Old 11-26-2007, 12:10 AM
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Quote:
Originally Posted by AJ Peacock View Post
Stoney point was purchased by Hornady not too long ago.

You will need 2 of these MidwayUSA - Hornady Lock-N-Load Bullet Comparator Insert 338 Diameter

and 2 of these
MidwayUSA - Hornady Lock-N-Load Bullet Comparator Body

A good digital caliper makes using these very quick and accurate.

Instead, I purchased the headspace kit and the comparator kit, so I could measure all calibers etc. The headspace kit comes with a .330 insert, so measuring the baring surface for 338 can be done without a second .338 insert. The .338 insert is actually .330 and is marked as such.

MidwayUSA - Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator
MidwayUSA - Hornady Lock-N-Load Bullet Comparator Complete Set with 14 Inserts



AJ

AJ

If I was going to only use it for my 338 which is the cheapest way to go ? I think my friend has a headspace guage ? Many thanks for your help

DUH
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