Rifle trim length variability

[CA_Shooter]

Hi everyone, I have a few questions about trim rifle trim length

This is for:
•6.5 creedmoor
•Trim length is 1.910
•max length is 1.920
•Hornady brass

Question 1:
1. I trimmed some short, as short as 1.9065. Can I use these as foulers? Or will it cause pressure issues?

Question 2:
2. What kind of accuracy variability will I see from variable trim lengths? Trim length variability is between 1.911 to 1.9145

I currently shoot anywhere between .25-.60 MOA with my rifle at 100 yards (haven’t neck sized yet which I plan to do soon)

Thanks

 

[ebb]

No pressure issues, the theory on differing trim lengths is that they will have less neck tension the shorter the necks are. I doubt you will see a difference. If this is good match brass I would shot them as sighters but keep them in the same box as the rest and soon they will all be the same length again, and they can all be a happy family.

 

[CA_Shooter]

No pressure issues, the theory on differing trim lengths is that they will have less neck tension the shorter the necks are. I doubt you will see a difference. If this is good match brass I would shot them as sighters but keep them in the same box as the rest and soon they will all be the same length again, and they can all be a happy family.

Great that is what I thought, they’d grow and soon be a happy family

Updated my post to point out it’s hornady

 

[Straightshooter1]

IMHO, keeping the trim length consistent helps avoid issues that a carbon ring build up can present. When the case length become long and extends into a thick carbon ring that's built up, it can cause the mouth of the case to pinch the bullet resulting in raising the pressure, which can result in increased velocity that effects accuracy. This also can create too much pressure where you get pressure signs depending on how stout your load is. Of course, if you always removed the carbon ring when cleaning, then it's not an issue.

 

[thatguyshm]

I have basically stopped trimming since I got my Sinclair chamber depth gauges. I'm finding most chambers are anywhere from 0.025 to almost 0.050" longer than maximum case length. Keep them all about the same length and enjoy less trimming.

 

[dolek]

I have basically stopped trimming since I got my Sinclair chamber depth gauges. I'm finding most chambers are anywhere from 0.025 to almost 0.050" longer than maximum case length. Keep them all about the same length and enjoy less trimming.

Same here, Sinclair gauges are the way to go . I have found most of my guns will never need the brass trimmed because of length . I may choose to trim it for uniformity at times ,it's nice to have that option.

 

[338 dude]

You know this is just another use for the Teslong borescope chamber a piece of brass and actually look in your chamber you can see the clearance get one that is longer than the rest but still has the proper clearance measure it and you are good to go As said earlier most chambers don’t match these gauges Or reloading manual lengths

 

[jds holler]

My latest theory, -- Fill your chamber with brass, and it won't fill up with carbon. jd

 

[bobm]

That's a solid theory, jds. Here we have about .025 of exposed steel ready for the first coat of that nasty carbon. 50 shots later you got some scrubbing to do.

 

[Bill K]

Great that is what I thought, they’d grow and soon be a happy family

Updated my post to point out it’s hornady

So it's Hornady, does that mean it is wrong ? You can trim any brand of brass too short, when you are trimming. Pilot error, you know.

 

[mikecr]

That excess clearance is the cause of carbon ring buildup. You can see how it forms here:

 

[CA_Shooter]

So it's Hornady, does that mean it is wrong ? You can trim any brand of brass too short, when you are trimming. Pilot error, you know.

Ebb asked if I was using good match brass. I consider Hornady to be pretty good brass but I was just giving more information that I had left out with my initial post