Suppressors Suppressor and better SD#s and better Accurracy: Normal?

[ronas]

Is it normal for a suppressor in this case on a 308 to be more accurate with the suppressor than without. When I chronograph 5 rounds with suppressor they had a Extreme spread of 4 ft. per second. Extreme spread on rounds not shot thru suppresor were good but not as consistent and a few were faster than the suppressed rounds which increased the extreme spread quite a bit.

 

[RyeDaddy]

My rifle shoots tighter groups with suppressor than without. I'm getting great ES/SD numbers with the can, but haven't chronographed without. Headed to the range in the AM, I'll try to get some numbers on mine with/without and see if mine does the same thing.

 

[ronas]

Below are my numbers.
Using new 308 Lapua brass, fed 210 primer, neck sized 1/2 of neck with bushing die, 43 grs. varget, base to ogive measures 2.142".

Suppressed:
2685
2681
2683
2682
2682

Unsupressed:
2680
2680
2720
2720
2684

I've shot better strings unspressed before. This time barrel was hot. Probably human error when reloading. Something is going on as rifle is very accurate unsuppressed.

 

[jonaddis84]

Are you basing this conclusion off of one five shot string of each? If so this could easily just be a difference in the ammunition. Youll need to shoot a larger sample size to really know if this is happening, like 5 of each.

If it is happening, its possible the suppressor is adding just enough pressure to get your load into a sweet spot, perhaps increasing powder charge could get you to that same sweet spot unsuppressed. Just a theory, may not be possible depending where youre at now.

 

[ronas]

Are you basing this conclusion off of one five shot string of each? If so this could easily just be a difference in the ammunition. Youll need to shoot a larger sample size to really know if this is happening, like 5 of each.

If it is happening, its possible the suppressor is adding just enough pressure to get your load into a sweet spot, perhaps increasing powder charge could get you to that same sweet spot unsuppressed. Just a theory, may not be possible depending where youre at now.

I shot only my reloads which are as follows: New Lapua brass which I did neck size half length of neck with bushing die, (next time will be shooting fireformed brass, may be better or worse?)
175 Nosler, Fed 210 primer, 43 gr. of varget, base to ogive measures, 2.142". This is the most accurate load for this rifle I worked up. Use suppressed or unsuppressed.

 

[Lowlight]

Those 2 high readings can be a chrono error, muzzle blast polluting the readings, or you might have just made a mistake.

 

[ronas]

Those 2 high readings can be a chrono error, muzzle blast polluting the readings, or you might have just made a mistake.

When I was shooting I did have a number of shots that did not register. Chronograph indicated missed one sensor or the other. Conditions were clear and sunny with sun nearly right overhead; which I don't think is ideal. Chrono gave as many error readings with suppressed or unsuppuressed. I think I was about 20ft away from 1st sensor.

Probably best try on a partly cloudly day with sun off to one side.