- Location
- Western Manitoba
Maybe you are trying to set two different things? One version of "comparator" should help you get the brass case fitted to your rifle's chamber - is other ways to do so. That creates a level of "end play" between the bolt face and the chamber shoulder when the bolt is closed (on a shouldered case). I do not own such a "comparator" - I never have over 40 some years of reloading my hunting and plinking rounds - so I could learn what improvement they produce - 5 shot groups at 100 yards is the only "measure" of success that I go by.
Separately, you can play with the COAL, which is how far into that case that you seat that bullet - is another kind of "comparator" that should help you do that - not going to measure to bullet tip - is alleged that you will be measuring to the bullet ogive. Is often measured with a calliper from base of case to tip of bullet. Has to fit into the magazine - enough clearance in there to feed properly. After getting dimension for magazine, you might be able to play with bullet "jump" - nothing to do with the case length, at that point - your case either fits correctly or it does not. Various people will have different thoughts on what "correct" fit of case might be.
For most of us, I suspect we arrive at a COAL that produces "good enough" groups on a target - is various ways to establish how many thousandths of inch that your bullet has to move from your case until it hits the lands in your barrel. I understand that some Black Powder target rifles with soft lead bullets might want the bullet "jammed" into the rifling before firing - was various tools at one time where you seated the bullet into the chamber - pressed in hard on the lands - then a powder filled case was inserted as separate step - in effect "seating" the bullet as you closed the action. Those have no bullet "jump" or actually a negative "jump" - tends not to be a good idea with jacketed bullets, at all. Circa early 1900's shooters were doing well under 1" at 200 yards - 10 shot groups, using that technique. Some rifles and bullets might like .012" of bullet "jump"; some might prefer .060" or more - up to you to find out what your bullets and your firearm want - no body else using a different bullet lot, or a different rifle can do that for you. Most of us will set the seater die at that desired seating depth and load up a batch. Will be some differences from bullet to bullet, even from the same box of bullets - so your COAL will not be exactly the same, if you load up 100 rounds and do not adjust your seating die. Most of us do not own seater dies that have the seating cup ground to contact at the bullet ogive only - I am sure some people have that - I do not.
https://www.canadiangunnutz.com/for...t-10-shot-group-at-200yards-with-cast-bullets!
Separately, you can play with the COAL, which is how far into that case that you seat that bullet - is another kind of "comparator" that should help you do that - not going to measure to bullet tip - is alleged that you will be measuring to the bullet ogive. Is often measured with a calliper from base of case to tip of bullet. Has to fit into the magazine - enough clearance in there to feed properly. After getting dimension for magazine, you might be able to play with bullet "jump" - nothing to do with the case length, at that point - your case either fits correctly or it does not. Various people will have different thoughts on what "correct" fit of case might be.
For most of us, I suspect we arrive at a COAL that produces "good enough" groups on a target - is various ways to establish how many thousandths of inch that your bullet has to move from your case until it hits the lands in your barrel. I understand that some Black Powder target rifles with soft lead bullets might want the bullet "jammed" into the rifling before firing - was various tools at one time where you seated the bullet into the chamber - pressed in hard on the lands - then a powder filled case was inserted as separate step - in effect "seating" the bullet as you closed the action. Those have no bullet "jump" or actually a negative "jump" - tends not to be a good idea with jacketed bullets, at all. Circa early 1900's shooters were doing well under 1" at 200 yards - 10 shot groups, using that technique. Some rifles and bullets might like .012" of bullet "jump"; some might prefer .060" or more - up to you to find out what your bullets and your firearm want - no body else using a different bullet lot, or a different rifle can do that for you. Most of us will set the seater die at that desired seating depth and load up a batch. Will be some differences from bullet to bullet, even from the same box of bullets - so your COAL will not be exactly the same, if you load up 100 rounds and do not adjust your seating die. Most of us do not own seater dies that have the seating cup ground to contact at the bullet ogive only - I am sure some people have that - I do not.
https://www.canadiangunnutz.com/for...t-10-shot-group-at-200yards-with-cast-bullets!
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