I have A theory

[Ffisher]

This is for all the bolt action pistole and rifle owners. I've been thinking about this since I got my Diana Chaser pistole about 2 months ago.
Here is my theory on how to increase power. Put the bolt tip into a pellet, you can see how much room the bolt pin takes up. Now if you can use the bolt to push the pellet in into place then back off on the bolt just a little, it would allow more air into the skirt of the pellet which in turn would give the pellet more power.
What do you think ? I think this would only work with guns that seal the bolt with an O ring in the barrel. On the Chaser, after the pellet is seated in place, the bolt can be moved back about 1/8th of an inch before it goes past the O ring seal. What do you think ? would that extra 1/8th" extra space in the pellet skirt to make a significant difference ?

 

[nervoustrig]

Retractable bolt probes are a thing.

For the most part, it is unnecessary for pellets. It is more beneficial for slugs, allowing for full bore porting all the way to the base of the projectile.

 

[starlingassn]

the chaser has a pin type probe if i remember correctly.

i doubt moving it back would offer any significant increase in power.

 

[Ffisher]

Thanks for your replies. Appreciate it. It was just a theory.

 

[Nattboy]

Thanks for your replies. Appreciate it. It was just a theory.

Keep on thinking. That's what what makes this addiction so much fun. Go to utube and look up BIG J'S OUTDOORS AND AIRGUNS. He has a wealth of knowledge when it comes to the Diana Chaser. He helped me and worked on my .22 caliber Chaser rifle. It now shoots a jsb 13.4 gr. pellet at 615 plus fps. That's over 12 flbs. Hell man, I am 73 and just getting started with this habit. I love my Chaser rifle but it made me fall down the pcp rabbit hole.

 

[Bigragu]

I may be mistaken but unless your gun was designed for pulling the bolt back to free up more air thru the transfer port and into the pellets skirt, you may run into a problem with the hammer lug crashing into the cocking lug, shortening the hammer stroke from full travel.

Bolt guns that are designed to be pulled back after seating the pellet usually have another notch out to role down and lock the cocking handle which would then raise the cocking lug out of the way.

As I’m writing all of this I’m thinking of the marauder. If that gun is fired without locking down the bolt and your cocking hand not on the cocking handle the high pressure air shoves the bolt back and a whisp of air gets thrown back at you, so not all the air went to driving that pellet out the barrel.

 

[Ffisher]

Bigragu, what your saying makes sense. I did not consider the cocking lug in my theory. I was thinking just grind the bolt handle slot 1/8" to the rear. Now as you mentioned the cocking lug, the internal lug slot would also have to be ground rearward. I bought a right hand breach for my Diana Chaser rifle so I have a left handed breach to modify . Will I do the modification? Not sure but will think about it. I'm thinking that it might not increase FPS enough to make the mod worth doing.
P.S. In case anyone wants to know, the reason for the right hand breach on the rifle and not my pistol is I can easily cock the pistol with my right hand but thr rifle is too long and ocward to do with my right hand. Now cock rifle with right hand and bolt handle is on the right.

 

[Nattboy]

Keep on thinking. That's what what makes this addiction so much fun. Go to utube and look up BIG J'S OUTDOORS AND AIRGUNS. He has a wealth of knowledge when it comes to the Diana Chaser. He helped me and worked on my .22 caliber Chaser rifle. It now shoots a jsb 13.4 gr. pellet at 615 plus fps. That's over 12 flbs. Hell man, I am 73 and just getting started with this habit. I love my Chaser rifle but it made me fall down the pcp rabbit hole.

Thank you

 

[drumie]

The American Air Arms Slayer has a probe that retracts after it seats the slug. Works great and is a great design.