The point of impact changes are really different with the suppressor for this batch. Groups move up, down and/or right. The shift is not nearly as uniform as it was in the other tests.

Yes.

Point of impact moved quite a lot.

Might be due to the fact that the silencer was heavier for this rifle.

Point of impact is of no importance in this test.

If I were you, I wouldn't let that rifle go for love nor money. I'm surprised it likes everything, including the 110gr.
As for the with/without, I've never owned a suppressor but it's obvious in your test that it does make a difference in accuracy.
Thanks for sharing.

I guess I'm missing something here, but which groups are with and which are without the suppressor? I'm guessing that the right-hand groups with the group size with a red background are with the suppressor. Is that correct?

Have you done a statistical comparison of average group size? In general is group size increased with the suppressor (although some comparisons are in the other direction)?

quote:

Originally posted by South Pender:
I guess I'm missing something here, but which groups are with and which are without the suppressor? I'm guessing that the right-hand groups with the group size with a red background are with the suppressor. Is that correct?

Have you done a statistical comparison of average group size? In general is group size increased with the suppressor (although some comparisons are in the other direction)?

Groups on the left, blue, are without.

On the right, red, are with.

Top targets are ones with better groups WITHOUT.

Bottom groups are better WITH.

A friend, who shoots long distance targets, suggested I do a run with just one bullet and load, shoot 20 groups with, and 20 groups without.

I will do that and post the results.

Talking of accuracy, I have noticed that practically all newly made rifles, especially European ones, are very accurate.

quote:

Talking of accuracy, I have noticed that practically all newly made rifles, especially European ones, are very accurate

Accuracy has been improving for decades.

Jack O'Conner would call a 1 inch rifle a miracle.

Better barrels, better bullets, better optics have all contributed to more accurate rifles today.

How often are you checking the suppressor for tightness on the barrel.

quote:

Originally posted by p dog shooter:
How often are you checking the suppressor for tightness on the barrel.

After each 5 shot groups.

It never get loose.

Are you noticing any velocity changes between suppressed and not suppressed?

quote:

Originally posted by MtElkHunter:
Are you noticing any velocity changes between suppressed and not suppressed?

Not really anything to worry about.

over all average is slightly less with the silencer, by about 12-15 fps.

Interesting, but not unusual.
A bullet accelerates a bit after leaving the barrel as the gas overtakes it, creating a partial vacuum ahead of it while still pushing against the base.
This is clearly visible in photos of bullets that have just left the muzzle.
But your silencer reduces the gas pressure considerably before it can have much effect.

I think any difference in results might be due to the additional weight added to the end of the barrel, which alters the barrel vibrations.

We might make a barrel tuner specifically for this rifle, and use the same load used for our test.

Interesting results by shooting 20 groups, each, with and without the silencer.

I hope to post pictures tomorrow.

Quite a difference.

But, I suspect this was due to the weight at the end of the barrel, no the silencer.

We are making a barrel tuner for this rifle to replace the silencer.

Let us see what happens.

That is a significant difference in accuracy in all categories; smallest group, largest group and average group with the silencer in place.

Wasn't it Browning who came up with the first commercial, tunable muzzle weight/brake? I remember the benchrest rimfire shooters starting it many years ago also.

Yes, the Browning BOSS.

Never really caught on.

We are making a barrel tuner for this rifle to replace the silencer.

It might take some time, but I intend to do a comprehensive test.

Any suggestions on how to run the test would be much appreciated.

First thought of course is shoot at different settings, same load as shot with silencer test.

See how the results are are decide from there where to go.

Saeed,
I have seen similar results using a 7mm Rem Mag in an R8 Blaser. I prefer to shoot suppressed just due to recoil and noise but see a slight accuracy improvement.
I suspect the improvement is the shooter (me) holding the gun better when firing.

I would agree that the silencer probably effects the barrel harmonics. One test that would be interesting is to take one of the loads that have a big difference in group size where the groups are larger for the silencer and adjust the powder in half grain increments to see if you can adjust the load to the new harmonics with the silencer on it. Maybe even quarter gain increments. I have found that if you have harmonics issues slight changes in the load can may a big difference.

Barrel tuners are mostly turned out or in on threads to adjust the weight slightly. I've wondered if using rare earth magnets or lead tape to find the ideal weight of the tuner might be quicker/easier for gross adjustments.

I'm currently working up loads for a 6mm ARC. Which I bought to shoot the 95-105 grain bullets for coyotes. I'm only testing it with the suppressor on as I'm using it for night hunting and want to bother the neighbors as little as possible.

The damn rifle seems to show a strong preference for the 58 grain Hornady V-max at 3,200 fps over the Berger and Hornady 95s and 105s