New project: .177 slug gun

[Dairyboy]

With all the new slugs coming out for airguns from NSA I've always wanted a .177 slug shooter. I have a .177 Mrod that has been sitting for over 6 months not even knowing how it shoots. Well put the .177 upper on the SS valved airtube I have from my .22. My goal is to have 2 tunes for it. 1 for slugs (hoping they shoot well!) and one for pellets to plink in the backyard and such.

5 shots shooting the 10.34 AA pellets at 22yds at a whopping 1100fps for a cool 27fpe! Lol can't wait to test slugs.



Also 5 shots at 22yds around 900fps with same pellets. This is an accurate Mrod!

[bandg]

Would love to see you stretch that distance out a bit with some larger shot count groups comparing the two velocities and see what happens.  Might be very interesting.

[Dairyboy]

Yeah I'll do more once I get the slugs which should be Thurs. I just wanted to see quick accuracy and rough fps before I do any real testing. I always start at 22yds then move to 55yds once proven accurate at shorter distances.

[bandg]

I certainly hope the slugs work well for you.  I have some to try myself when time permits.  But I am really interested in the comparison you've already put up using the AA pellets.  I'd love to see that pellet compared with larger shot count group sizes at longer range between the two velocities you noted.  Looks like you didn't lose any accuracy at increased velocity at 22 yards.  Some 10 shot groups at 55 yards shot with the AA pellets at each velocity could be very informative. 

[WeeHeavy]

Subscribed!
Question: Are you using a stock choked barrel, or a modified one?

[Dairyboy]

Bone stock straight from crosman barrel. I have a buddy whose used a stock barrel and has awesome results with the NSA slugs.

[WeeHeavy]

Good to know! Thanks for the info. Really interested to see how you do!

[Dairyboy]

Good to know! Thanks for the info. Really interested to see how you do!

Thanks! I'm excited to see as well!

I certainly hope the slugs work well for you.  I have some to try myself when time permits.  But I am really interested in the comparison you've already put up using the AA pellets.  I'd love to see that pellet compared with larger shot count group sizes at longer range between the two velocities you noted.  Looks like you didn't lose any accuracy at increased velocity at 22 yards.  Some 10 shot groups at 55 yards shot with the AA pellets at each velocity could be very informative. 

I'm curious as well so will be doing the test when I get the slugs and will do the comparison then. That way same shooting conditions and all.

[bandg]

Will be watching and thanks for the effort.  I'll post any results on NSA slugs through the Condor when I have a chance to shoot.

[oldpro]

subscribed

[Wayne52]

My Prod shoots the BBT's very well but it's far from being a stock gun too.  That barrel seems to like them.

[gendoc]

My Prod shoots the BBT's very well but it's far from being a stock gun too.  That barrel seems to like them.

my prod does well also with rick morrell's hpbt from the stock barrel,
but thats all thats stock too 

[screwwork]

Looking forward to your results, I have heard the .177 barrel is great for piledrivers.

Rocker1 did his magic to my Prod .177 bolt,  .177 barrel, lead was worked on for ease of loading slugs & piledrivers port opened up and redid the crown, SS Valve ported to .160 and some LDC's.
It will be a while before I get to put it all together in my Prod.

[Dairyboy]

Can't wait to hear more about your .177 prod hammer Randy! I'll look into the piledrivers as well.

This gun shoots great in all honesty. I was sure that just cause it was a crosman barrel it wouldn't shoot but a few dime size groups at 55yds says otherwise. Slugs should be here tomorrow but just realized probably won't get to try them until Friday.

[Ribbonstone]

Good luck....but I'd be suspect of anything over .320" in length due to the "standard" twist rateof .177 barrels.

That doesn't limit weight so much as shape. Even at that length (.310-320") could be a decent flat base (Lets say 18.5-19.5gr). And maybe moving at 920-950 fps (lets say  36 foot pounds in a moster-air-,oving PCP) as a maxi-max for an accurate .177.


I've not made it to that level....more like 32-33 foot pounds.


HAve tried Piledrivers...and now that they have been used up in the ONE rifle that shot them well enough to use, can't honestly say I'm sorry to see them go.  I did look today for at least a few "left-oversa" to lathe to a shorter length (more like 18-18.5gr) but if any are sill around they are hiding form me.



IF I were to seriously try the really long/wel lshaped/ +20gr. /177's for long range, would likely strat with a faster twist barrel.


With a "normal" (lets say "pellet-wwist":barrel, would keep to 18-18.5gr. or under.


But evwn there, I''ve had deep hollow based/long nosed H&N 16.4gr. pellets "fail"...they have the weight,but also have a too long length for whatever I've tried them in.

[Dairyboy]

Got a rough tune in today. Not too bad but I'm almost 100% sure will be better with something that's not supersonic lol

Created: 09-12-2018 06:00:21 PM
Description: .177 SS valve
Notes 1: 3175-2300psi
Notes 2:
Distance to Chrono (FT): 3.00
Ballistic Coefficient: 0.031
Bullet Weight (gr): 10.340
Altitude (FT): 0.0
Temp: 70 °F
BP: 29.84 inHG
Shots
#     FPS        FT-LBS     PF
29    1093       27.43      11.30     
28    1092       27.38      11.29     
27    1099       27.74      11.36     
26    1102       27.89      11.39     
25    1105       28.04      11.43     
24    1111       28.34      11.49     
23    1112       28.40      11.50     
22    1118       28.70      11.56     
21    1120       28.81      11.58     
20    1122       28.91      11.60     
19    1124       29.01      11.62     
18    1130       29.32      11.68     
17    1134       29.53      11.73     
16    1133       29.48      11.72     
15    1137       29.69      11.76     
14    1131       29.37      11.69     
13    1135       29.58      11.74     
12    1139       29.79      11.78     
11    1136       29.63      11.75     
10    1135       29.58      11.74     
9     1137       29.69      11.76     
8     1138       29.74      11.77     
7     1133       29.48      11.72     
6     1130       29.32      11.68     
5     1122       28.91      11.60     
4     1118       28.70      11.56     
3     1112       28.40      11.50     
2     1106       28.09      11.44     
1     1096       27.58      11.33     
Average: 1120.69
StdDev: 15.03
Min: 1092
Max: 1139
Spread: 47
True MV: 1133.06
Shots/sec: 0.16
Group Size (IN): 0.00

[Ribbonstone]

Maybe you have better luck than I do at near transonic speeds at longer range (lets just say anything in the 1030-1100fps range).

Normally, as you expect to do with slugs, will most often switch to a hevier pellet once speeds pass the 4-digiet range.

So far, somthing in the 16-18grain  range at somthing close to 950fps (call it 32-35 foot pounds) has worked out better than somthing in the 10-12 grain range at 1100 fps (call that 29 foot pounds).  It's not so much the energy as it seems to be the weird sonic-transition velocity zone.

[Wayne52]

I need to try some of these new cast pellets in my Prod, they're lighter@23g than the BBT's but I'll bet they shoot good.

[AncientSword]

The NSA 15.5 grain slugs shoot pretty well from my Disco at about 950 fps ...

[Dairyboy]

Maybe you have better luck than I do at near transonic speeds at longer range (lets just say anything in the 1030-1100fps range).

Normally, as you expect to do with slugs, will most often switch to a hevier pellet once speeds pass the 4-digiet range.

So far, somthing in the 16-18grain  range at somthing close to 950fps (call it 32-35 foot pounds) has worked out better than somthing in the 10-12 grain range at 1100 fps (call that 29 foot pounds).  It's not so much the energy as it seems to be the weird sonic-transition velocity zone.

Yeah I agree. The only reason I did this tune with the 10.34gr pellets was just I have a ton of them and don't want to waste the slugs once they get here.

The NSA 15.5 grain slugs shoot pretty well from my Disco at about 950 fps ...

Good to hear about that