Diana 350 arrived! And trouble...

[LAalex]

Yes, it's your fault and you should feel guilty!

LOL!

Just kidding.





I'm a little under the weather now, and have to go to Nationals tomorrow, so I'm a bit overworked, my apologies too.

If we want to go back to the Original post intention, perhaps I should say that the best way to alleviate the Difficulty in chambering pellets in DIANA, slanted breech actions is by turning a small wooden or plastic piloted-cone to the appropriate shape and size, and then attach it to a "piano wire" rod that you can pull from the muzzle.
 
You can then cover the cone with sanding paper in progressive grits and give your gun a true in-line chamber.

Care should be taken with the muzzle end of the barrel with a crown saver type tool, but results usually grant this level of attention.

BTW, this method will work with either slanted or right angle breeches/breechfaces.

HTH



I use the ones in the link below for the jobs Hector mentions.  I also use them to flare/true the skirts of JSB and AA pellets which are often deformed.  Congratulations on your success with the 350. I love mine (.22) even though its the ugly plastic one.

https://www.squirreldaddy.com/category-s/324.htm

[AG72]

Took her apart yesterday and noticed that there was some nicks in the pistonseal, luckily i had another one that i got from an online auction with a metall piston sleeve also, so swapped it and put the gun together and today i did some chrony shooting, before the numbers was 846 ft/s (258 m/s) with JSB 10.34gr, now 892 (272) and the power was 16 ftlbs (22 joule) before and now it's 18.5 (25) and with JSB 8.44 it was 951 ft/s (290 ish m/s) before and now 994 (303) and the energy was 16 ft (22 joule) before and now it's 18.5 (25) also, could not do any shooting string cause the sun didn't want to cooperate but the numbers are in the middle of different speeds that the chrony showed, hopefuly the accurasy is the same cause it was nothing wrong with that, will hopefuly do some testing next week when i have some time off

[dtdtdtdt]

I checked the Straightshooters OUR TAKE listing for the RWS 350
in .177 with the JSB Exact Heavy 10.34gr.  They quote a muzzle velocity of 904f/s. 

That is insignificantly different than your 892f/s. 

Great job!

[AG72]

I checked the Straightshooters OUR TAKE listing for the RWS 350
in .177 with the JSB Exact Heavy 10.34gr.  They quote a muzzle velocity of 904f/s. 

That is insignificantly different than your 892f/s. 

Great job!

Yes thank you thats pretty close, and it was -2 C so that numbers can be even closer when it gets warmer here

[dtdtdtdt]

Do not expect the numbers to match to the third digit or even the second one very often.  There are several sources of differences that make such precision very unlikely.  Temperature, condition of the rifle, exact weights of pellets, pellet shape, exact barrel length, barrel cleanliness, and a host of others. 

Use averages to get your estimates of velocity, energy, and accuracy.  To get a velocity average, shoot at least 10 pellets over your chronograph and use the statistical program that probably was provided with your chronograph to get an good idea of performance.  If it doesn't have one, most scientific calculators or calculator apps will have the same calculations available.

Keep the data and check your rifle regularly to determine the rifle's condition (sort of like taking your temperature to see if you are sick.)   If you see a big change start looking for problems. 

Comparing two rifles shot on different continents, or even side-by-side, with the same pellets, the same shooter, on the same range, etc....  will still give different results. 

850f/s plus or minus 20f/s would be considered good.  Repeatability in one rifle of plus/minus 10 day to day is good too. 

Have fun!