RAW REPORT

[SMH77]

So, based on what I saw with the energy output change today in .30 caliber, I used the change in energy to predict what might happen in .25 caliber based on data comparisons from shooting under similar temps and conditions bewteen the two calibers. In short, I think (with the temps where they are-in the mid 50's) the .25 cal can hit in the upper 60's to low 70's for energy @ 55F, depending on the pressure and humidity outside. Here's my estimates of 1 yard velocity and energy:

For reference, here's a chart showing the velocity change over temperature (at 1 yard) in .25 caliber to show how much it can vary:

Blue entry is the rifled barrel, all others are the polygon barrel:

Hope this is useful information...



Sean

 

[crgabel]

Sean,

Thanks again for your efforts is supporting the shooters of this forum. Your technical writing abilities are second to none.

Craig

 

[Brislee]

3 weeks ago I called RAW with a few questions about getting an older TM 1000 repaired. It is about 5/6 years old from what the owner says and hasn't been shot in 2 years. Sat with little to no air in it. Talked to Lea and she got me prices on repairs. Then I asked about ordering a new TM 1000 if I decided not to buy this gun. 20 weeks is the current wait. No big deal, I really want the gun for next season field target. (HTF ) So I told Lea what I would want if I ordered one and she asked if I could hold for 2 mins. I did and she returned to tell me that they just finished a gun (just like I would order) and that the buyer backed out. I was given the chance to buy with no wait....I did. The gun arrived Friday........

I am so grateful to have the chance to buy this gun without having to wait. The gun is 19 ftlbs w/AA 10.34 The one and only difference between what I would have ordered and this gun was the stock. I would have ordered the same stock in the laminate. Now that I have it I'm glad I got the Walnut. Don't have a scope for it yet cause I didn't think I would get it till spring. Once I get a scope and get the gun dialed in I will post some groups.

 

[SMH77]

Great to hear Brislee-and a beautiful gun too! Congrats!

 

[Hynzie]

CRAIG the DONNIE FLA ADAPTERS are all different for different calibers ,the RAW barrels are measured in mm like 14 mm15mm16mm23mm24mmm26mma couple may not be true sizes but DONNIE is trying to produce a universal fitting one size fits all,,ive heard some guys buying a 30 cal ldc and using it on a 30 and 25 cal,soon we will get moinfo from DONNIE,

 

[crgabel]

I'll be purchasing one for each of the .25 and .30 cal. The .22 is real quite as delivered. I can't wait to make it happen.

Craig

 

[Hynzie]

me too gonna be great  SHHHH

 

[DeutschKSK]

LDC adapter needed for my 60 ft/lb .25... lol the wait sucks. 

 

[Kdog]

So i was out shooting the Blue Beast yesterday and what a BLUEtiful morning it was. Shooting small groups at 50 yds over and over. When i was shooting i started to notice when i cocked the side lever there was some sticking of the pellet probe when it was cycling. So i started investigating and looking at the pellet probe and noticed there is some play in it where you can wiggle it from side to side.I also noticed that you can see some threads from the pellet probe and was wondering if it is backing out some how. This is a HM model and was wondering if you guys can check to see if your guns are like that? I will post a pic of the threads of the pellet probe that are exposed,,,i grabbed and turned it trying to screw it back in but it didn't budge so perhaps this is how it should look?





It was a BLUEtiful fall morning!!!!

 

[Imold]

Here is my HMx .30.

 

[Imold]

My HMx .357 is the same.

 

[SMH77]

I think the threads you are seeing are the adjustment threads Martin uses to set the initial probe depth and can be threaded in and out to obtain the adjustment needed initially. I don't know for sure, but it looks like he may use a thread locker of some sort after making the adjustment (JB Weld or something-definitely not loctite)?

With swapping calibers between .25 cal and .30 cal, there have been times when I felt the probe 'sticking' as I was cycling the probe backward to cock the gun-is this what you are referring to? If so, what I've found was the tiny 1.5 mm hex set screw was slightly 'proud' of the black part of the probe and was scraping on the inside of the action when cycling the bolt backwards. In your photo, it's the small set screw that is just starting to enter the action in your partially cocked gun.

When I swap calibers I've learned that the set screw I referenced needs to be threaded in just enough to make it 'not proud' of the black part of the bolt body so that it doesn't hang up on the action. The screw does NOT tighten onto anything on the inside-it merely acts like a retaining ring (so to speak) to keep the silver part of the probe from ejecting forward from the black housing due to the probe spring.

Let me know if this makes sense. I can reply further later if more / better explanation is needed.



Sean

 

[Imold]

What Sean said, it’s just a adjustment for the probe.

 

[Imold]

Now that I pulled my 30 out of the safe I feel like throwing a apple or two out into the the lake and do some living room to lake shooting being it’s rainy,cold,overcast and foggy outside, hmmmmmm..

 

[nomojo65]

Ya,Just listen to sean!

 

[zx10wall]

Like Sean explained, the threads you see there are to adjust the probe to barrel breech seal. I had to adjust my .25 probe a bit when I had some slight probe blow-back. As Sean also suggested, on my .25 probe there is some type of glue on the threads. After loosening the tiny set screws, I heating mine a bit and turned CC to lengthen about .020" to get the side-lever to cam correctly and the breech to seal. If your side-lever cams closed well and you don't have a breech leak, there is no need to worry with it. 

The set screws on the black portion are, just as Sean explained again, retainers for the probe assembly. They need to be flush at the surface of the arrangement, no more shallow or deep than that. Basically, listen to Sean 

 

[SMH77]

So for anyone wondering, I threw my .25 cal polygon barrel back on and left the HS tension maxed out. JSB Heavy Mk I velocities averaged 942 fps at the muzzle (equates to 66.5 fpe). Surprisingly (to me) the BC dropped considerably at this higher velocity: down to 0.0490. Accuracy was so-so at this setting. I wouldn't draw many conclusions on the accuracy because it was really windy. Also, I've heard that the higher speeds in polygon barrels result in very fast leading up in the barrel. I haven't cleaned mine in like forever, so I should probably clean it, wait for calm conditions, and then shoot bench rested to see what I really think of theh groups at those speeds.

I'm inclined to just turn it back down though to about 890-ish fps again (at 78F)...

Any interest in having me clean the barrel and shoot groups at the current speed before changing it back down in power again?



Sean

 

[zx10wall]

Absolutely. Clean it and shoot it hot!! I suspect you will not have as good of results as shooting at 890-900 but I’d love to see you prove it

 

[SMH77]

Well, I didn't get around to shooting groups hot yet because I wanted to settle a debate in another thread regarding the effects of different barrels on the external ballistics of pellets. If anyone's interested in seeing how the polygon barrel compares to the LW rifled and the FX ST barrels, here's a comparison for you to enjoy.

I plan to get around to shooting the groups hot soon, so stay tuned...



Sean

 

[zx10wall]

Thank you for that comparo. The results are astonishing. Makes me very happy that I have a few polygon rifled barrels.