distance to ogative

[hunter1276]

i prolly spelled that wrong......... oki have read alot on this to get so far from rifling use stoney creek, hornady, rcbs etc. also split case neck insert bullet on trimmed case and candle it to load and adjust to get ogtive so far from rifling SINCE bullets vary and coal can be touchy measuring from base to tip of bullet would this work ............. please bear with me ........ ok use a casing timmed and ready to load bullet your using for the load, drill out the primer so my calipaer depth will fit load the bullet with a snug fit and slowly close bolt and latch. remove the "shell" measure the INSIDE from base os brass thru pimer hole to the bottom of the bullet. reset and do it twice more to make sure its correct and account for varieance "if any" then subtract desired distance from rifling say 50 for example set die using the mock shell. would measuring the inside to base of bullet work to get ogtive distance? once again be gentle lol hard to explain but this part is a pain in butt so many ideas on this.

 

[Desert Fox]

First of welcome to the forum hunter 1276. If I understand you correctly, you are trying to figure out your bullet seating depth.

You are correct that measuring the coal from the tip of the bullet to the base of the case is not accurate because bullet length varies. The proper way, as you already know is through the ogive. There are tools that can do that. I use one from Sinclair that you can attach to your caliper. It's called bullet comparator gauge but you can use it to measure your COAL also.

http://www.sinclairintl.com/.aspx/pid=3 ... Comparator

For this to work properly, you also have to segregate bullet by grouping them according the ogive measurement.

 

[hunter1276]

hey thanks, i appreciate the info and link. im crossing over from my archery to rifles and am getting the facts as i can. wife said i have to much stuff LOL,between all my archery equipment and what ive got in reloading lol. i told her i could be doing alot worse :grin: when i started this didnt realize how much was involved with it, heh. i have got everything figured out form primer to powder charge bullet now just getting a understanding of this i hardest part so i can work back from lands to find my guns sweet spot

 

[joelkdouglas]

First of welcome to the forum hunter 1276. If I understand you correctly, you are trying to figure out your bullet seating depth.

You are correct that measuring the coal from the tip of the bullet to the base of the case is not accurate because bullet length varies. The proper way, as you already know is through the ogive. There are tools that can do that. I use one from Sinclair that you can attach to your caliper. It's called bullet comparator gauge but you can use it to measure your COAL also.

http://www.sinclairintl.com/.aspx/pid=3 ... Comparator

For this to work properly, you also have to segregate bullet by grouping them according the ogive measurement.

Desert Fox,

Do you find group size benefit from sorting your bullets by length? Or at least that's what I'm assuming you're doing. Feel free to educate the ignorant if you're doing something else. I have the Hornady version of the comparator, so if you see benefit it would be an easy step to add.

v/r
Joel

 

[DrMike]

wife said i have to much stuff LOL

.

Hunter1276, all wives say the same thing. Welcome to the forum, and welcome to the challenging world of pursuing accuracy from your rifle.

Rommel, that is a great explanation. I'm certain it will prove beneficial to others. Thanks for the pictures.

 

[Desert Fox]

Desert Fox,

Do you find group size benefit from sorting your bullets by length? Or at least that's what I'm assuming you're doing. Feel free to educate the ignorant if you're doing something else. I have the Hornady version of the comparator, so if you see benefit it would be an easy step to add.

Hell NO! :lol:

Kidding aside, for hunting rifle... probably not. For long range shooting and competition however, it is essential. Sorting bullet by length will eliminate vertical stringing at longer ranges say 1000 yards.