Trim length

[Link]

1st Yup did a search
My question is only - how much difference in accuracy does trim length make.

ty Don

 

[old_heli_logger]

When properly trimmed, your brass should be squared to the body. This will allow your bullet to release from the mouth of your brass at the exact same time and should help with accuracy....I think, haha

 

[Straightshooter1]

1st Yup did a search
My question is only - how much difference in accuracy does trim length make.

ty Don

How much difference just depends. It's about the bullet release and timing of the blowby as the bullet is being released.

 

[rwj]

I recall Jack Neary stating in an interview (I believe it was Eric Cortina’s Believe the Target podcast) that he could see the difference that 0.010” variation in trim length created.

It would not be hard to create varying trim lengths to determine if the variation shifts the POI and/or group size in your rifles.

 

[Link]

I recall Jack Neary stating in an interview (I believe it was Eric Cortrina’s Believe the Target podcast) that he could see the difference that 0.010” variation in trim length created.

It would not be hard to create varying trim lengths to determine if the variation shifts the POI and/or group size in your rifles.

Wow .010 is a lot. Be pretty easy to maintain that.
ty Don

 

[jelenko]

Remember - there's benchrest accuracy and there's accuracy for other disciplines/activities.
Jack being able to see the difference may not make any difference to what you need/want to do.
I guarantee the amount of difference is way less than 1/10 of an MOA out to 300 yards.

 

[K22]

Remember - there's benchrest accuracy and there's accuracy for other disciplines/activities.
Jack being able to see the difference may not make any difference to what you need/want to do.
I guarantee the amount of difference is way less than 1/10 of an MOA out to 300 yards.

Spot on!

When I see these type questions asked on the forum, my first reaction is, what is your shooting discipline. Chasing a few .1's in group size may not be worth the time, cost, and bench time for your discipline unless you like to experiment those kinds of issues.

 

[JEFFPPC]

Spot on!

When I see these type questions asked on the forum, my first reaction is, what is your shooting discipline. Chasing a few .1's in group size may not be worth the time, cost, and bench time for your discipline unless you like to experiment those kinds of issues.

And add level of equipment and shooting skill. Lots of wishing and hoping.

 

[SeabeeKen]

I trim mine to chamber length -.010 to keep the bullet supported as long as possible and minimize carbon ring formation. As far as accuracy, It works for me.

 

[SKWERLZ]

I recall Jack Neary stating in an interview (I believe it was Eric Cortina’s Believe the Target podcast) that he could see the difference that 0.010” variation in trim length created.

It would not be hard to create varying trim lengths to determine if the variation shifts the POI and/or group size in your rifles.

I remember that discussion, it was that the specific length was mostly meaningless but all cases being trimmed to equal neck lengths was a big deal.

 

[603Country]

Many years ago I was trimming 220 Swift brass while I was watching the Super Bowl. I had the trimmer set wrong and I trimmed way too much. It was all the brass I had, so I kept using it. It was all trimmed to the same length, and didn’t make even a small difference in accuracy. That’s the only data point I have.

 

[Link]

When I see posts on Accurate shooter I think of accuracy on the bench. I think most common is 100 yds then out to 1000 or further. These posts on a mile or better are what I call lobing. lol
I guess we do have a page to cover plinking - hunting etc.
ty guys

 

[SKWERLZ]

When I see posts on Accurate shooter I think of accuracy on the bench. I think most common is 100 yds then out to 1000 or further. These posts on a mile or better are what I call lobing. lol
I guess we do have a page to cover plinking - hunting etc.
ty guys

I shoot a lot at a mile and beyond, factory ammunition leaves a lot to be desired at those distances, stuff like trimming and consistent bullet seating makes getting first round hits at a mile and beyond a pretty regular occasion.

https://rumble.com/v6vo0jv-338-at-1760-yards.html

 

[Steve Donlon]

I was getting worried until I measured some factory brass I just prepped and did not trim the brass because it was already short. It is all less than .010 difference. That is, a lot. .0010 , would be more work.