Desert Precision Gunworks 22LR Action Updates

[littlepod]

I keep up with 3 of these rifles so let me explain just a little bit.

For the bolt that goes with the pics above the pin is out 2 turns with a 15 lb. white spring.

On my bolt the pin is out 2 turns with a 14 lb. red spring.

On the 3rd bolt the pin is out 1 turn with a 14 lb. red spring.

Each bolt is just a little different but set up the way I described they all give the same results.....firing pin strike and on target. I found differences in where the cocking piece indexes when the pin is screwed all the way in and also in the number of turns out it takes for the firing pin to bottom out in the bolt nose.

My headspace is .043/.044 best I can tell.

Hope all this makes sense Sir.

I did the tuning of the firing pin, and I went from 22# spring down to a 15# spring. I never had any failures to fire, but after running a few hundred rounds of ammo, I have found the 22# spring to still have the best SD/ES and group sizes. So I've just left it at 22#.

 

[BillZ]

I keep up with 3 of these rifles so let me explain just a little bit.

For the bolt that goes with the pics above the pin is out 2 turns with a 15 lb. white spring.

On my bolt the pin is out 2 turns with a 14 lb. red spring.

On the 3rd bolt the pin is out 1 turn with a 14 lb. red spring.

Each bolt is just a little different but set up the way I described they all give the same results.....firing pin strike and on target. I found differences in where the cocking piece indexes when the pin is screwed all the way in and also in the number of turns out it takes for the firing pin to bottom out in the bolt nose.

My headspace is .043/.044 best I can tell.

Hope all this makes sense Sir.

Thank yo for the information, greatly appreciated. My last tuning of my V22S bolt is 4 turns out with a 20 b spring. The index from screwed all the way in is 3/4 of a turn, so the bolt is now 4 & 3/4 out. I test my V22s using the Eley x-shot targets, for me groups don't seem to tell me much. Shooting for score on the x-shot target tells me how I and the gun are doing. My last two targets shooting a new lot of center x are the best I have ever shot with the V22S one was 250/250 x18, calculated group 9.03mm, the other was 249/250 x17 group 9.79mm. So I am at 4&3/4 turns with a 20lb spring. I like the results a lot but don't know how I got to this point with the bolt, other than trial and error. I want to understand how, not trial and error. Mike Bush says the VG video is not how to tune the bolt, waiting for his reply to my how-to do-it question.

 

[BowChamp]

I did the tuning of the firing pin, and I went from 22# spring down to a 15# spring. I never had any failures to fire, but after running a few hundred rounds of ammo, I have found the 22# spring to still have the best SD/ES and group sizes. So I've just left it at 22#.

You've got one on me, I have no idea what the SD/ES numbers are on the ammo I've been shooting. In the last 12 months I've probably shot well over 50 different lot #'s of ammo.

Have you modified the tip of your firing pin to hit inside the rim?

 

[BowChamp]

Thank yo for the information, greatly appreciated. My last tuning of my V22S bolt is 4 turns out with a 20 b spring. The index from screwed all the way in is 3/4 of a turn, so the bolt is now 4 & 3/4 out. I test my V22s using the Eley x-shot targets, for me groups don't seem to tell me much. Shooting for score on the x-shot target tells me how I and the gun are doing. My last two targets shooting a new lot of center x are the best I have ever shot with the V22S one was 250/250 x18, calculated group 9.03mm, the other was 249/250 x17 group 9.79mm. So I am at 4&3/4 turns with a 20lb spring. I like the results a lot but don't know how I got to this point with the bolt, other than trial and error. I want to understand how, not trial and error. Mike Bush says the VG video is not how to tune the bolt, waiting for his reply to my how-to do-it question.

Like yours one of our pins is 3/4 turn and the other two are only 1/8 of a turn from index when the pin is all the way in. This is one of the very noticable differences I've found. Another is none of the three pins turn out the same number of turns from index to touch the bolt nose. These differences are the reason it's difficult to go by how others set up their firing pins and springs.

The more you turn your firing pin out, the more relaxed the firing pin spring is. On the other end, if you don't turn the pin out far enough you take a chance on the cocking piece bottoming out inside the bolt tailpiece when fired.

Sounds like your rifle is shooting pretty good so you shouldn't have any trouble fine tuning it. I think good ammo and reading conditions are the two biggest factors of all.

Thanks!!!

 

[littlepod]

You've got one on me, I have no idea what the SD/ES numbers are on the ammo I've been shooting. In the last 12 months I've probably shot well over 50 different lot #'s of ammo.

Have you modified the tip of your firing pin to hit inside the rim?

Yes, maybe I could do more -