Maverick Compact at 50 yards

[DonaAna1]

Went to the desert today to try out another slug in the maverick compact .25.
Trying out the neilsen 29.5 gr. flat base
I really did like the 6 shot group.
5 shots at .35 ctc, 6 shots at .67.

.

I could really use a little help though with figuring out a problem I am having with the gun.
I used the FX chrono to determine speeds.
They are as follows

1. 916
2. 907
3. 935
4. 914
5. 916
6. 932
7. 912
8. 916
9. 936
10. 919
Any idea why so bad a spread 29 and SD is 9.9

 

[madeintheuk]

My guess is not enough reg, and too much hammer. Trying increasing reg pressure, and lowering the hammer down 1 click at a time and record spread. Don’t look at speed for now, just how tight your spread is. If it gets tighter, you know you have too much hammer for that reg setting. If you want more power, increase reg a bit and start again. You’re looking for the balance between reg and hammer spring for a nice tune.

 

[CoyoteGod]

Could be several reasons. I have found the cause for me being most often the projectile not the rifle, or a combination of. Let's use rimfire as an example. If you did testing on nice rimfire ammo, you would see average spread of 50 or more FPS, if you buy more expensive ammo, it will drop you spread because the manufacturing process has much tighter tolerances. Now the same applies to slugs. The closer the weights, diameters, and length are the better the spread will be, typically. Also, could have issue if you are not using a weight or slug type that is best for your tune and gun barrel length. Using rimfire again, the example is 16" barrel vs a 22" barrel. They will perform about the same, because of burn rate and drag, same with air, if you are cycling the air perfectly for the length of barrel you get a better spread and SD. If you are pushing too much air or too little you may have more spread, or you are compensating more with hammer spring to get more speed when you have a short barrel.

This may point you in a few directions that could improve your spread. However, AEAC and many others point out that spread is secondary to accuracy. Many times we look at the tune more then the accuracy. They speak in depth about this as missing the mark on airguns. Tune for accuracy first. I have a wildcat .25 that shoots 34s at 915ish with a spread of about 30, but damn it is a ragged one hole rifle. Shouldn't one with the spread, but it is. The 25s shoot with a better spread, but not quite as accurate, close but not quite. This is a good example. Chose the accuracy over the spread.

To me with that 50 yard group, in a compact you are shooting wonderfully, to me again, your spread is completely reasonable also. You could end up chasing your tail improving spread, but losing accuracy.

 

[douger]

like he said reg presure all about tune with hammer long process

 

[douger]

Went to the desert today to try out another slug in the maverick compact .25.
Trying out the neilsen 29.5 gr. flat base
I really did like the 6 shot group.
5 shots at .35 ctc, 6 shots at .67.

.View attachment 275139
I could really use a little help though with figuring out a problem I am having with the gun.
I used the FX chrono to determine speeds.
They are as follows

1. 916
2. 907
3. 935
4. 914
5. 916
6. 932
7. 912
8. 916
9. 936
10. 919
Any idea why so bad a spread 29 and SD is 9.9

fx chrony not that accurate in my book either cheap caldwell work better

 

[CoyoteGod]

fx chrony not that accurate in my book either cheap caldwell work better

Unfortunately this is a very true statement. However I think FX is offering the best product with the limitations of size for a radar type chrono. ProChrono is better, more accuracy (I think) and captures all the shots. Douger is a man that would know with all the tuning he does.