Suppressors - first round impact shift

[hibernation]

Man, that 30 cal can to baffle scraping on a 223 would tell me that can is either WAY out of whack, or the muzzle threads are not concentric to the bore, that's a 340 ID catching a 224 bullet diameter.

It almost certainly would've been the 7mm-08 that caused that, that's the first rifle I used it with.

 

[Chris_in_Idaho]

That makes more sense than the .223, but still, .284 should have had quite a margin.

 

[hibernation]

Update: finished some more thorough testing and am now confident that there are no issues with it, at least on this rifle. I'm basing this on 6 separate 3-shot groups all fired on separate days from a completely cold bore. So, every time I was out I'd shoot a string of 3 at 100yds on separate targets. Measured them all out, plotted in excel, went overboard with some stats, and any variation by shot order seems to be just due to chance. Here's what the 18-round spread looks like (Tikka 223, 16" barrel w/ Diligent LTi, Hornady 55gr SP):



Extreme spread is 1.9", mean radius 0.5". Seems reasonable for inexpensive ammo and a mediocre shooter. Lots and lots of washboard gravel roads between each group, so this is also reassuring for zero retention at least.

Since I had all the shot locations in excel, I also wanted to look at round count vs. zeroing. This next figure is what my total adjustment in mils would be as round count increased. Nothing groundbreaking but it does confirm what everyone has been saying lately, by 10 rounds I'm within a click. I'll continue to use a 10-round zero.



Maybe Diligent fixed the issue when I sent it in, maybe it was unique to one rifle/suppressor combination, maybe I just suck and jumped to conclusions off a few bad/random shots. My takeaway is I need to keep better data, especially with new setups.

 

[longrange13]

Update: finished some more thorough testing and am now confident that there are no issues with it, at least on this rifle. I'm basing this on 6 separate 3-shot groups all fired on separate days from a completely cold bore. So, every time I was out I'd shoot a string of 3 at 100yds on separate targets. Measured them all out, plotted in excel, went overboard with some stats, and any variation by shot order seems to be just due to chance. Here's what the 18-round spread looks like (Tikka 223, 16" barrel w/ Diligent LTi, Hornady 55gr SP):

View attachment 894074

Extreme spread is 1.9", mean radius 0.5". Seems reasonable for inexpensive ammo and a mediocre shooter. Lots and lots of washboard gravel roads between each group, so this is also reassuring for zero retention at least.

Since I had all the shot locations in excel, I also wanted to look at round count vs. zeroing. This next figure is what my total adjustment in mils would be as round count increased. Nothing groundbreaking but it does confirm what everyone has been saying lately, by 10 rounds I'm within a click. I'll continue to use a 10-round zero.

View attachment 894087

Maybe Diligent fixed the issue when I sent it in, maybe it was unique to one rifle/suppressor combination, maybe I just suck and jumped to conclusions off a few bad/random shots. My takeaway is I need to keep better data, especially with new setups.

Nice data, thanks for sharing.