Say you had a wide node but lean on the edge of the node for your rifle's load. You have a TBAC brake can on/off is just .1 down (can on). Decided to switch to Hellfire. Now its .3 low and .3 to the left (repeatable) but you notice your groups are open up slightly. Could the brake be causing this? I honestly doubt it but wanted to see what the experienced shooters had to say.
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Is it possible for a brake change to cause load change?
- Thread starter thisguy65
- Start date
Anytime you attach something to the end of the barrel it changes the harmonics of the barrel. This can certainly affect accuracy.
If you reload you can tune the ammo again. If you don't then you can try other ammo's and hope....
If you reload you can tune the ammo again. If you don't then you can try other ammo's and hope....
My point of impact changes drastically (a matter of inches at 100 yards) on whether my brake is on or off the barrel. The brake most certainly can affect accuracy and POI. You'll have to tune the ammunition and the optics to correct this. The gun is actually more accurate with the brake on but has to be resighted and tuned as far as ammunition.
VooDoo
VooDoo
Fine, it causes a barrel change that then can have the effect of throwing your prior load and barrel out of sync requiring you to refine a new load that shoots well. Better?
How about it can change your preferred load?
How about just rolling with the obvious intent of the conversation and not semantics?
“It’s not a hot water heater because hot water doesn’t need to be heated. It’s just a water heater”
How about it can change your preferred load?
How about just rolling with the obvious intent of the conversation and not semantics?
“It’s not a hot water heater because hot water doesn’t need to be heated. It’s just a water heater”
It most certainly can! How do you think barrel tuners work?
This is how it effects impacts with a 1/4 turn out in between each shot. With its 7/8-32 threads thats 1/32=.03125 and 1/4 of that is .0078" difference in its location between each shot. So youre saying that adding a few ounces of mass in addition to the added length on the end wont do anything?
http://www.geoffrey-kolbe.com/articles/rimfire_accuracy/tuning_a_barrel.htm
This is how it effects impacts with a 1/4 turn out in between each shot. With its 7/8-32 threads thats 1/32=.03125 and 1/4 of that is .0078" difference in its location between each shot. So youre saying that adding a few ounces of mass in addition to the added length on the end wont do anything?
http://www.geoffrey-kolbe.com/articles/rimfire_accuracy/tuning_a_barrel.htm
Adding anything to the barrel can change not only POI but harmonics, and a load that previously shot .5 MOA can open up to 2 MOA. In point of fact, a break or suppressor can alter the BC of the bullet, changing your dope.
I thought so, I put a lot of time in to my load development (most for learning). Would it be wise to just change the load and see how it acts? take .2 grains out? It's still a .5-6 rifle but was .3-.4 I know I'm split hairs with the difference but a increase is a increase. I do need to shoot some more targets to verify what I'm seeing.
Yep, that's all it might take, and/or running a seating depth test again. Find the node with the charge and tune the accuracy with seating depth.
Yes! Agree! Someone always has to try to turn it into a pissing match. The Dalai lama could post words of wisdom on here and someone would twist it 10 ways just to start an argument
I guess the barrel Turner would be similar to what Tub was talking about, he suggests turning a self timing break out 1 turn and locking it down to see how it effects the load.
If it's worth anything.... I appreciated the hit water comment. If this was an argument you've already won spife.
If it's worth anything.... I appreciated the hit water comment. If this was an argument you've already won spife.
I was helping out a friend at the range this past week that was experiencing a similar issue. His new build has a 26" proof c/f barrel. He was struggling with accuracy with a fat bastard brake on. He asked me to try it. I took the brake off and threaded on my ultra 9 and shot a 1/2" 5-shot group. I handed him the rifle back and said, you try. He proceeded to shoot another very respectable group. We then took the TB off and put the fat bastard back on. I'm not sure we clocked it exactly the same as it was when we first started shooting, but it was pretty close. POI was almost 2" left and high after putting the brake back on and groups opened up to 1.5+ again. Next test was shooting with nothing on the barrel. Groups tightened right up again ?. I have never seen a barrel effected so much by a brake. Is it just messing up the harmonics of the barrel??
I did a test earlier this year with my .260, I shot 5 with the brake off, 5 with a 419, 5 with a Brad's precision, and 5 with a slabbed Muscle brake. The results where dramatically different and it wasn't only POI. For whatever reason the muscle brake had the tightest group - around .3. the Brad's was tight but had a bit of vertical and was right at the half inch mark. With no brake on it was almost a perfect half inch circle (meaning vertical and horizontal dispersion was the same). And lastly the 419 was nearly an inch in vertical. Thinking something was weird I used degreaser and made sure the brake was clean and torqued well, tried it again and the same thing happened with the 419.
Now they all shot the same load, I'm sure if you worked up a load for each they would end up just as accurate as another. Hope this helps you.
Now they all shot the same load, I'm sure if you worked up a load for each they would end up just as accurate as another. Hope this helps you.
That is way more testing than I would care to involve myself in, even on the financial end of things. Your last sentence is spot on though, I guess it has never occurred to me to try diff brakes, I'm a settler, or under achiever, take your pick, lol
D
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I deleted my shit as hostile. I'm trying real hard to become the shepherd and not the tyranny of evil men that attempt to poison and destroy my brothers.
I guess what I'll do
1) To save some time and money is swap back to TB brake as I have brakes on 4 rifles (Bolt and AR's). Swap when the barrel gets replace on the Creedmoor
2) Just tweak the load...I need 2 more mounts for ARs
1) To save some time and money is swap back to TB brake as I have brakes on 4 rifles (Bolt and AR's). Swap when the barrel gets replace on the Creedmoor
2) Just tweak the load...I need 2 more mounts for ARs
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