OAL vs Ogive
 

Who seats their bullets by OAL and who seats by the Ogive measurement? When seating bullets by OAL I could never get any kind of consistant seating depthvia OAL due to the inconsistant tips on bullets. I have went to seating all my bullets using the Hornady's Comparator gauge and am finally getting consistant seating measurements.

RE: OCL vs Ogive
 

absolutely, I have two different ones, one from wilson and the stoney point version. Every reloader should have one.

RE: OCL vs Ogive
 

Do you mean OAL Over All Length? I always seat to the Ogive that way you can actually determine how much bullet "jump" You have into the lands of the barrel. Some bullets like to be seated into the lands some just touching and some.010" or 015 thousands off.

RE: OCL vs Ogive
 

I imagine he means Overall Cartridge Length. The proper way to measure is obviously to the Ogive. I use the Sinclair measuring tool, it is simple to use, and works great. But it is also proper to measure the bullet by the weight.

Different bullet mfrs. seem to pay attention to ogive while others seem to pay more attention to overall bullet weight. It has been my experience that Sierra bullets have less weight variation, while Hornady has more weight variation. But then Hornady ogive's have been more consitent than Sierra.

IMO this benefits Hornady in the lighter weight varmint bullets, and it benefits Sierra in the heavier big game bullets. This may sound silly but I have watched it over the years , and it has been fairly consistent. I have went through whole boxes of Sierra 155 grain Palma's that have not varied more than .1 of a grain. Tom.

RE: OCL vs Ogive
 

Hate to speak for him, but what I think he is asking, when he is setting up his seater die for bullet deapth, do you measure off the tip (from your notes of course), or use a comparitor and set up your seater die off that measurement.

RE: OCL vs Ogive
 

I never heard overall length refered as OCL. My bad!

RE: OCL vs Ogive
 

Sorry for the confusing typo, meant OAL:)

RE: OCL vs Ogive
 

By measuring off the Ogive which will give the most consistant bullet seating depth why would OAL even be important as long as it cycles in your rifle?

RE: OCL vs Ogive
 

I apologise but I had it backwards. I re-read the article and the case neck actually gets thicker with each firing and resizing due to brass flowing forward from the case walls getting thinner from repeated shooting and resizing and thickening case necks can cause a shell to fit too snuggly into a chamber not allowing the bullet to be freely discharged out of the casing properly causing a dangerous increase of pressure. It says when a case needs it's 5th trimming it is usually just best to throw it away. It stresses to maintain awareness of how thickthe case necks are getting with each resizing, how many actually do this? I don'tbut should I be since I do FLS each time?

RE: OCL vs Ogive
 

I'm just a bit less anal than some, I suppose. The only time I had any trouble with any rifle brass was when I used some probably twice (or more) fired Nickle plated brass when fire forming loads for my 30-06 a.i. Seeing how it's a single shot, I don't have to worry about it cycling in the action. I have a Stoney Point OAL Gage, but generally just seat my bullets to a specified COL that I have predetermined. The GameKings, with their exposed lead tips don't always measure the same, but the polymer tipped bullets usually all measure the same. I still trim the case after each firing and resize, though, just because....

RE: OCL vs Ogive
 

honestly, I use a dummy round and a black magic marker.

when it's seated deep enough the lands quit scraping the ink off,
an OAL is taken
then
it's checked to see if it functions in the magazine

if it passes there, a load is worked up
and yes, COAL is played with a little bit

RE: OCL vs Ogive
 

"honestly, I use a dummy round"

I use a case that has been full lenth resized. Seat the bullet way out of the case, put a little grease on the bullet and then stick it in the gun and close the bolt. Take the round out, measure the OLA and reduce it by .010-.040 for the finished live round.

RE: OCL vs Ogive
 

Iwasn't going to put it quite that bluntly, but what Razorhead said is my "predetermination".;)

RE: OAL vs Ogive
 

it's the relationship of the ogive to the lands that matters. while there are different ways to measure it....by far the easiest is to use a comparator gauge. to use the tip of the bullet and go by an oal to determine the seating depth is downright risky.[8D]

RE: OAL vs Ogive
 

i should point out thatmy prior post concerns rifle cartridges....for handguns it is the oal from the tip of the bullet that matters. sorry for any confusion.[8D]

RE: OAL vs Ogive
 

I use the same as what ridge runner has there..At one time
I trimmed the little lead tip off the bullets and made them
all the same length..But now that I have gotten away from
the competion game,I don't worry about it at all...1 to 3
thousands doesn't matter..

RE: OCL vs Ogive
 

Ogive

RE: OCL vs Ogive
 

I also use a black marker but I take a unsized case and put a small flat spot in it by just pushing the side of the case against my bench, just enough to make the bullet a little snug. Then I black the bullet out with the markerand place it in the chamber and close the bolt. I then take it out of the chamber and carefully pull the bulet back out until I see where it stopped in the blacked out part. I put the bullet back in just to where the line in the blacked out part is and then measure the Ogive and that is my OAL unless they won't cycle in my magazine then I start seating deeper until they just barely will cycle in my magazine. I do this 3-5 times to make sure I get a good consistant measurement.