RTI RTI Mora just keeps getting better.

[JoePolanco]

On the back of my previous post about shooting my first ever 250, I thought it appropriate to follow up.
I simply can't get over how insanely consistent this gun is. Here are another four targets, this time at 50 yards with two different pellets, the JTS 29.63 grain and the AEA 29.5 grain. Would a different day, after many tuning adjustments, produce different results? Well, I'm happy to say, NOPE.

Each target represents a VERY SLIGHT difference in dwell setting gradually ending up where I wanted to be, in that 970-975 fps range.

 

[MACTEN]

Did you start with the valve all the way open? Curious what the start fps was prior to tweaking. Those Jts are screaming! Very nice shooting Joe.

Oh, and what's the reg set to? I've been fine tuning mine (600 .25) for 38 grain .250 Zan's but a buddy is doing well with those same JTS pellets you are shooting and 36 grain H&N .25's

 

[maxtrouble]

@JoePolanco - Very nice results. What chronograph are you using?

 

[Bobr]

Still waiting on mine to get shipped
that is real good consistency and might get better the more you shoot it
thanks for posting the groups
keep it up

 

[JoePolanco]

@JoePolanco - Very nice results. What chronograph are you using?

This is the Labradar LX. It's awesome. Built like a tank, automatically calculates BC, never misses a shot, and frequently updated. I've had it since October and it's leaps and bounds better than any of the others I've tried. ( FX pocket, FX true bal, Garmin and the Velociradar )

 

[JoePolanco]

More RTI MORA stuff. If you guys get bored with this, let me know, I'll stop.

Thursday at the range with the .25 caliber Mora shooting 1026.7 fps

Today after 150 frustrating shots with the AEA 33.9 pellets which apparently my gun does not like.
Over the course of the last week I've shot over 800 of the 33.9 pellets in both JSB and AEA brands from speeds of 860 all the way through 990 fps. I've have no luck at getting them to group or even land consistently at any speed. Very disappointed with the AEA 33 grain pellets in this gun. Fortunately, my Skout Epoch absolutely loves them.

Anyway, I switched to 29.5s in the last few minutes of this mornings session, and decided to try 1030fps which had been recommended to me by another shooter. (sorry, I don't remember who it was). I bumped the reg up ever so slightly and hit 1030 instantly. I then proceeded to grouped 5 shots in a fingernail size hole (about 1/2 MOA at 100yds) and decided to shoot a target.

This was the immediate result.

 

[Centercut]

Amazing target at 100Y Joe…. Wow!!!

 

[manabeknives]

Head scratching speed!?!? but the results speak for themselves
Awesome shooting
Keep on posting unless you're getting bored with the results

 

[turbospud]

precision 33g slugs produce really good accuracy at 1050fps too

 

[JoePolanco]

Did you start with the valve all the way open? Curious what the start fps was prior to tweaking. Those Jts are screaming! Very nice shooting Joe.

Oh, and what's the reg set to? I've been fine tuning mine (600 .25) for 38 grain .250 Zan's but a buddy is doing well with those same JTS pellets you are shooting and 36 grain H&N .25's

Im strictly a bench shooter so slugs are not anything I've experimented with. As for pellets, my tune began at 110 bar on the reg with the valve adjuster 1/4 turn from fully closed. Ideally I was aiming for 970 fps with the 29.5 AEA pellets. The results were excellent but even so someone recommended I try 1030 fps. Well that speed too is yielded excellent results.

My tuning philosophy for pellets is pretty much the exact inverse of what most guys use to tune slugs. I believe in a short sharp blast of air to get the pellet out of the barrel with the absolute minimum amount of trailing air. This minimizes the vortices that cause drag and pull the pellet offline. So what does that mean? It means a higher reg pressure and a very short dwell time for the valve.

 

[MACTEN]

Im strictly a bench shooter so slugs are not anything I've experimented with. As for pellets, my tune began at 110 bar on the reg with the valve adjuster 1/4 turn from fully closed. Ideally I was aiming for 970 fps with the 29.5 AEA pellets. The results were excellent but even so someone recommended I try 1030 fps. Well that speed too is yielded excellent results.

My tuning philosophy for pellets is pretty much the exact inverse of what most guys use to tune slugs. I believe in a short sharp blast of air to get the pellet out of the barrel with the absolute minimum amount of trailing air. This minimizes the vortices that cause drag and pull the pellet offline. So what does that mean? It means a higher reg pressure and a very short dwell time for the valve.

My valve (same 600mm .25) was half open when I got it and I started tuning it for 37 grain zans.
I ended up with 937 fps (120 bar) and my valve seems almost closed now as I was going for the same results I guess. Short blast for me means more shots but I like your explanation as a better reason for doing it.
After reading your posts and watching airgun advisor, I ordered a bunch of the same pellets and as well, my buddy is shooting those same pellets in his 600mm .25 with great results at 50.
I would have never thought pellet at those speeds would be accurate especially at those distances.

 

[Centercut]

My valve (same 600mm .25) was half open when I got it and I started tuning it for 37 grain zans.
I ended up with 937 fps (120 bar) and my valve seems almost closed now as I was going for the same results I guess. Short blast for me means more shots but I like your explanation as a better reason for doing it.
After reading your posts and watching airgun advisor, I ordered a bunch of the same pellets and as well, my buddy is shooting those same pellets in his 600mm .25 with great results at 50.
I would have never thought pellet at those speeds would be accurate especially at those distances.

They are…. INDOORS or short range like 50Y. You never know outdoors if the slightest puff of wind could cause instability. I think Joe and his Mora are doing great, but let’s see how they do real world (PAC or EBR) before we get too excited.
I haven’t shot the .25 cal AEA 29.5 that fast but I have shot the .22 cal AEA 21.9 that fast. Accurate at 100Y when still. Any breeze at all and there went stability. When I moved them to 990 fps they were better, but 960 fps was the best for stability and accuracy at 100Y.

 

[JoePolanco]

Did you start with the valve all the way open? Curious what the start fps was prior to tweaking. Those Jts are screaming! Very nice shooting Joe.

Oh, and what's the reg set to? I've been fine tuning mine (600 .25) for 38 grain .250 Zan's but a buddy is doing well with those same JTS pellets you are shooting and 36 grain H&N .25's

As a pellet shooter I use a quick, VERY short burst of air so I get as little trailing turbulence as possible. With that in mind, I start with my valve all but closed. Just about 1/8 of a crack open. I then adjust my regulator to about 10-20 fps under my desired speed. Then I begin opening the valve 1/8 of a turn at a time until I achieve the speed I'm looking for. This technique will generally give me the best SD for any desired speed using pellets.

My friends that shoot slugs mostly do the opposite. Starting with the valve wide open, they set the reg to 20 fps above their target speed and then begin slowly closing the valve until they get to their speed.

 

[JoePolanco]

They are…. INDOORS or short range like 50Y. You never know outdoors if the slightest puff of wind could cause instability. I think Joe and his Mora are doing great, but let’s see how they do real world (PAC or EBR) before we get too excited.


Absolutely. Wind introduces an entirely different dynamic. The general rule Ive always followed is the higher the wind, the lower the speed should be.