Will it work...NSA 12.5 grain .177 slugs in a Brocock Compatto FAC?

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Blackpaw

Blackpaw

Member
Apr 23, 2020
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Idaho, United States
In the past I tried some NSA 15.5 or 17 grain slugs (can’t remember) in my Brocock Compatto Sniper XR in .177 when i got it. Well, the performance was lack luster to say the least.

Well, now the Compatto is on its way to the USA to my buddy who bought it. Since I tried the fore mentioned slugs I see there are now 12.5 grain slugs from NSA (at least available here) and now I am curious if they will work in the same Compatto, at least single shot, for my buddy.

If I may have your thoughts I would appreciate it and I will pass them on to my buddy.
 
was testing NSA "Sample Slugs" nearly all day today. The .20 cals in 15.5,18 & 21.8 weights, The new .177 in 10.5 and a 20 something weight, A new .25 cal in 35 & 40 grain weights.





Now as to the .177 10.5 ... shot it slow in the 600's and fast as 1110 fps !! with a lot in between 800-950 ranges. SADLY pellet showed random yet consistent instability that is likely due to the short length and just not able to get centered and yaw free when chambering. It really did not change a lot in overall group size no matter speed or gun shot in.

All my testing was at 50 yards and the @ average POI range from about an inch to an inch and a half or so. Always random up/down/left/right never really stabilizing at any speed or barrel and able to shoot bug eyes accurate. Now the NSA 15 grain in my testing is the Stand out !!! 50 yards shot at @ 940 fps EASILY covered by a dime all day long !! this threw an LW standard rifled / choked barrel.

The 12.5 weight sits sorta in the middle being overall accurate in many cases .. but not stellar either.



Have a a bunch of data and picture from the day i will be sharing soon As i get the time to format all the info and data collected today.



Scott S
 
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was testing NSA "Sample Slugs" nearly all day today. The .20 cals in 15.5,18 & 21.8 weights, The new .177 in 10.5 and a 20 something weight, A new .25 cal in 35 & 40 grain weights.





Now as to the .177 10.5 ... shot it slow in the 600's and fast as 1110 fps !! with a lot in between 800-950 ranges. SADLY pellet showed random yet consistent instability that is likely due to the short length and just not able to get centered and yaw free when chambering. It really did not change a lot in overall group size no matter speed or gun shot in.

All my testing was at 50 yards and the @ average POI range from about an inch to an inch and a half or so. Always random up/down/left/right never really stabilizing at any speed or barrel and able to shoot bug eyes accurate. Now the NSA 15 grain in my testing is the Stand out !!! 50 yards shot at @ 940 fps EASILY covered by a dime all day long !! this threw an LW standard rifled / choked barrel.

The 12.5 weight sits sorta in the middle being overall accurate in many cases .. but not stellar either.



Have a a bunch of data and picture from the day i will be sharing soon As i get the time to format all the info and data collected today.



Scott S
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Hate to hear that on the 10.5's. I was hoping for good test results. As to the 12.5's, they were stellar from my Pulsar. Maybe both the 12.5's and 10.5's will shoot better in some guns than others.
 
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I was not trying to disused folks for shooting the 12.5, just saying what my initial testing is showing.

Here a target shot yesterday that was not a select group .. just shot it this the result. 10 shots each target with 15 grain NSA on LEFT the 12.5 NSA on right. shot off bags at 50 yards.

DSCF0944_35.1607361478.jpg
DSCF0947_35.1607361938.jpg






Shot from my JSAR Raptor Mini with a 22" LW choked standard rifling barrel. Being most high end guns are sporting LW standard barrels these days, a good example IMO.



Scott S




 
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No problem and thanks for the information. FWIW, my 12.5 gr. groups from the Pulsar look like your 15 gr. groups so maybe, much like pellets, it might be very much individual gun dependent. The 12.5's shot well enough for me to order 6000 of them and I was hoping the 10.5's might be similar.
Click to expand...


What speed are you shooting the 12.5's ?
 
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After reading your testing I was concerned that maybe I hadn't tested the 12.5's enough before I ordered the large lot. I shot a few groups off a bare table before I placed that order and they shot very well. I went out with the bench and bags a bit ago. All groups with the 12.5's out of the Pulsar were under 1" at 50 yards, most about 6/10's to 7/10's and largest dimension was horizontal due to a light breeze today-I think it could be better. At 65 yards they produced several groups of 1 inch or just under, again slightly horizontally strung and smaller vertically. I haven't been a big slug proponent as I shoot mostly shorter distances with my air guns but these slugs shoot very well out of that Daystate barrel so I would assume that similar results might be seen with other Daystates. The Pulsar shoots them at 960-970 on high power. Maybe as you noted the 12.5's are near the limit for stability due to length and the 10.5's are too short? I will have to try some though since the 12.5's are very good from my Pulsar.
 
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Having shot the prototype 10.5's in 3 different rifles ... results were consistent enough, just not that accurate sadly. Yup there bearing surface is short and if a barrels leade is not a sizzle fit keeping then square & true to bore there going to tilt entering rifling of if a long freebore jump into rifling with YAW present. Wobbling slugs don't fly straight sadly.



I'm sure a purpose set up barrel would shoot them great with it having a Slug spec .178" leede/ freebore and having the slug just touching rifling as bolt is closed.
 
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I did shoot a few 12.5's through the Condor today as well but I didn't have the chronograph out at that time. Oddly I'd have three or four in a good tight group and then a flyer an inch away. They wouldn't even engage the rifling until I bent a "seating tool" to press them in about a quarter of an inch beyond the breech end. Without that they would just fall out of the breech. I wonder if what you mention could be the issue there as well and if they might shoot better in that barrel if seated a bit more aggressively?
 
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I took out my .177 barrel for my TM-1000 which seats from breech seal into rifling ... No freebore or leede at all. Will test it on Tuesday and see if this does a better job of squaring them up upon loading. * was using the TM in .20 cal ... so took a few hours in making hammer / spring and regulator set point changes to get the NSA 10.5 to shoot @ 900 fps.

Got it done about the time the sun was setting ... O'well
 
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I have tried the 11g from 2 different vendors. Field target tech n Griffin ammo...with great results up to 100y as stupid as it sounds what ever dare to stand form 94y to 110y is simply dead..even when my .177 compact cricket is only pushing them at 800fps at the most...I wish I could have some Nielsen in 10.5g to se how they work but they are not available.
 
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I took out my .177 barrel for my TM-1000 which seats from breech seal into rifling ... No freebore or leede at all. Will test it on Tuesday and see if this does a better job of squaring them up upon loading. * was using the TM in .20 cal ... so took a few hours in making hammer / spring and regulator set point changes to get the NSA 10.5 to shoot @ 900 fps.

Got it done about the time the sun was setting ... O'well
Click to expand...



Could not stand it ... took the TM barrel back out placing in the lathe. .177" reamer into the bore for @ .125" depth still being 100% behind the transfer port.

Loading a .178" SLUG now is a firm push having 90% of the slugs straight wall bearing surface slide into the barrel having the YAW alignment DEAD NUTS at zero.

Closing the bolt pushes the slug forward being 100% within rifling sitting just slightly forward of transfer port.

This mod is ALL one can do making sure a slug is introduced to bore straight and true as mechanically possible.



We'll see in the morning with 10.5 and 12.5's being tested at > 20 fpe power.
 
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