ES. .222Rem.

[kenbro]

I know ES has been discussed before, but, can anyone explain why one round can vary by 100 fps from the next round when all are made as near exactly the same as I can get them.
Case prep the same, bullet seating the same and powder within 1/10 grain. (Non blended)
Thanks, Ken.

 

[finnbear270]

How is the group on paper @ 100?.

 

[Donkey Basher]

Case volume would be my call, and/or neck tension - 222 necks are prone to work hardening due to being long & fairly thin walled.

 

[gixer1]

Case volume, neck tension, flash hole inconsistency, seating depth variance, powder charge variance - all seem to play a part!

A wise man told me that ES on a 223 wasn’t that big a concern…

 

[Smellydog]

I don't have this worry now I don't have access to a chrony....!

 

[kenbro]

I don't have this worry now I don't have access to a chrony....!

Sd;
If I could get out over the fields to shoot as much as you do, I wouldn’t be so sad as to need to occupy my time looking at a chrony.

 

[Smellydog]

Sd;
If I could get out over the fields to shoot as much as you do, I wouldn’t be so sad as to need to occupy my time looking at a chrony.

Ken I wish you could get over for a session.
Maybe in the spring?

 

[kenbro]

How is the group on paper @ 100?.

This one of the better ones, some around a inch.

 

[finnbear270]

I wouldn't be worrying about the Extreme spread, @ 100 that is certainly good enough for foxing.

 

[jcampbellsmith]

Some other possible factors -

• Inconsistent annealing
• Different case mouth deburring
• Different powder weights
• Poor barrel
• Poor quality bullets
• Inappropriate powder
• Crap chrono

A lot depends on your personal reloading processes. Are you achieving an ES of less than 25fps with your other rifles consistently?

Regards

JCS

 

[Malxwal]

Not .222, but .223, I was getting a bit frazzled over the ES. A calming beverage and some interwebs, and it seemed that big ES was a feature of 223, and even competitive shooters weren't too concerned, as it was what was on paper that mattered.
I'm now sitting here, unhappy because I can't get a rifle below an ES of 17...

 

[finnbear270]

Not .222, but .223, I was getting a bit frazzled over the ES. A calming beverage and some interwebs, and it seemed that big ES was a feature of 223, and even competitive shooters weren't too concerned, as it was what was on paper that mattered.
I'm now sitting here, unhappy because I can't get a rifle below an ES of 17...

This^

 

[Andy RV]

How many rounds are you firing to measure your ES? If it’s less than 30 there’s probably a faster / slower one still to be found! From a statistical point of view SD is a better method, however the reality is that we very rarely test a sufficient quantity of rounds to have any level of confidence in the results.

Personally I’d concentrate on what the target is telling you.

 

[old 30-06]

I have no chronograph. I was very happy with my Sako 75 in 222, and the sub 1 inch 100 yard groups it gives with various home loads. My mate has a chronograph. I tested my home loads. My extreme spread was like the Cheshire gorge. Action was needed. I sent my mate and his chronograph packing. I am very happy with my rifle. I have no chronograph !

 

[finnbear270]

Ken, will you be borescoping the triple?

 

[kenbro]

Ken I wish you could get over for a session.
Maybe in the spring?

Need to get the Suprasinatus reconnected first!
Thanks much for offer though.

Some other possible factors -

• Inconsistent annealing
• Different case mouth deburring
• Different powder weights
• Poor barrel
• Poor quality bullets
• Inappropriate powder
• Crap chrono

A lot depends on your personal reloading processes. Are you achieving an ES of less than 25fps with your other rifles consistently?

Regards

JCS

Your first 2 factors involve some guesswork, but that doesn’t mean you can’t educate yourself to do manual repetitive movements very close to each other.
After a working lifetime of such things you do get a feel for what you’re doing.
I think I can discount the last 5, unless the new Garmin is crap.
Thanks for reply, Ken.

 

[kenbro]

Case volume, neck tension, flash hole inconsistency, seating depth variance, powder charge variance - all seem to play a part!

A wise man told me that ES on a 223 wasn’t that big a concern…

I’ve recently used new (PPU) brass and prepped it before use, same result.
I don’t think (But need to check more) that it’s the same cases giving bigger spreads.
Did your wise friend express the same opinion about the 222 as the 223
Thanks, Ken.

 

[gixer1]

I’ve recently used new (PPU) brass and prepped it before use, same result.
I don’t think (But need to check more) that it’s the same cases giving bigger spreads.
Did your wise friend express the same opinion about the 222 as the 223
Thanks, Ken.

Apologies chap! I read it as 223…

Edit - the wise man has now commented on here! @Malxwal!

 

[Malxwal]

Apologies chap! I read it as 223…

Edit - the wise man has now commented on here! @Malxwal!

Hmm, I maybe slept with a wise man....

 

[kenbro]

Ken, will you be borescoping the triple?

Nooooo