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Velocity Drop after cleaning (thoroclean)

I shoot a 6gt 109 bergers and varget and my rifle has been pretty consistent around 2800fps. I never go more than around 150 shots before cleaning and always clean after the first day of a 2 day prs match.

I recently picked up a bottle of thoroclean. I get tired of having to wait for carbon solvents to actually work. Ive used it a hand full of times and seems like it cleans my barrel really fast with little effort.

My routine is two patches of the flush, about 15 strokes with a nylon brush coated in the paste, about 5 dry patches, repeat the nylon brush and dry patches three more times, then at the end i push about 5 wet patches of the flush followed by another 5 patches.

This past weekend I was shooting in Mississippi and all day Saturday from the begging of the match till the end my rifle shot 2804 fps. Went to the hotel Sunday and did my normal cleaning routine. When i got back to the range Sunday morning for site in my gun was 60 fps slower and only got up to about 2775.

My question to those that have been using thoroclean is this something yall have seen. And no the barrel isnt shot out it shot very well and the SDs and ESs were very. Groups around 3/8 of an inch maybe has 700 rounds on the barrel.
 
Yea, for the first few rounds I would expect the M V to be lower. Normally after a few rounds are fired it will come back.
That has not been my experience. I just started with abrasives. I've tried Thorro Clean and JB.
Both seemed to drop my MV 50 ish fps and it basically stayed there for the rest of the life of the barrel. 3 barrels I've used them on have been like this.
 
Not Thorroclean related, but I've noticed a 75ish fps drop in velocity on the first shot after cleaning (normally just Boretech Carbon until patches are whitish, then a couple of Boretech Copper remover with a decent soak time.) Consistent enough that I started loading and shooting a couple of foulers before going back to shooting groups.
 
Started using the Thorro-Clean recently , as my barrel had about 2,000 rounds , and was starting to "creep" the Group open just a bit . Did the recommended process , and then repeated it a second time .
Shot two normal strings , as I would at a Match . Group closed back in , but the score was just "average", or should I say , NOT GOOD ENOUGH !
Went home ; Did my full normal cleaning process again , completely .
Then I did the Thorro-Clean again .
Two wet patches
Paste on Brush ; and thirty strokes .
More Paste on Brush , and twenty short strokes , about one foot into barrel
another light amount of paste on Brush . Twenty full strokes .
Four wet Patches
Two Dry Patches
Shot another two Relays a few days later .
199 - 10x and 198 - 9x .
Velocity was about twenty-twenty five fps slower on the first couple shots , and came right back up by the time I started shooting the first string . ( 5 Sighters )
S/D for 1st string was 6.4 , with a E/S of 12.9
S/D on 2nd string was 6.0 , with a E/S of 9.6
Temps went up by fifteen degrees , from 83F to right at 100F , and second string was 20 to 25fps faster through the entire string , but tighter on S/D and E/S . Go figure .

Since this barrel is about 75% used up , it will be a good candidate to do some testing for using Thorro-Clean , and how the Barrel will respond to different levels of cleaning process . As in how many strokes to get back to "clean" and how it shoots after that . Let everybody know what I find out , but so far , the reviews are good .
 
I don't think you *have* to do anything. Whatever process you choose, there are hundreds or thousands doing something different. I'm just looking for things that make it easier or more consistent or more precise, for me.
That’s very true on everyone doing it differently.
I just have the thought in the back of my head that it’s not good to send a bullet down a totally clean dry barrel.
 
My first few rounds after cleaning are always slower, especially, especially the very first round. This freaked me out the first few times my Garmin revealed it; now I just accept it as what my barrel(s) do.
Garmin reveals a lot…
 
Cleaned my 223 Tikka with thoroclean before local 600 yard match last weekend. My load of 90 smk's with R15.5 was down ~20 fps from the last time I choronographed it, but the barrel was a good bit cleaner this time. Temps were also a little cooler.
 

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