Recent content by NAProf

Ok, let me take a stab at it. Using my NW Crown as an example. With the stock hammer spring, the Huma 13-gram (4mm head) hammer weight, PW at 17, reg at 90 bar and the internal hammer spring (IHS) adjuster sticking out 4 mm the Potential Energy available for striking the valve pin is 490Nmm...

Tommy, What do you want to know about the Crown MkII :giggle: ? Ed has one that shoots great and I have a .177 and a .22 that also do. Tom Carlson's shooting with his Crown on this thread motivated me to purchase my first Crown. I love to talk about that rifle. PM me if you can stand me...

Hi Guys! It has been a while since I shot a card with my HFT rig, so I thought I would see how it is doing. I have done really well in HFT so far this season (better than 90% hit rate😊, except for offhand where last time out I did 25% of those😒). Anyway shot two cards and the better one is...

ED, Good info. I will have to have a conversation with you about your experiences with the 100yd BR at NAC :giggle: . I tried ViperJoe's tune and I can get them to fly at those speeds. I need to tweak the tune a bit to close the ES and find the best groupings, but it was giving pretty good...

Solo, Thanks, that is good info. I know that the LW polygonal barrels come with different twist rates than their land/groove barrels. Based on the info I presented the 1:30 twist rates for BRK/Daystate on the .22 MRD's makes sense as it gives a slower pellet spin rps. It seems they believe...

Thank you all for your input! I tried the tune ViperJoe suggested, and it is much better than where I had been. Even at 150 bar for regulator pressure I was able to shoot 3 magazines before dropping off the regulator. The MRD's were running at an average of 956fps and at 50 yds the accuracy...

To LDP and Vetmx, Thank you for taking the time to respond. I appreciate your insights. I think I am probably asking too much to get the MRD's to shoot at 900 fps from a 500mm barrel. The Maverick I use to have shot them really well, but it was a 700mm barrel. I might try really slowing...

I have been trying to find an tune for .22 JSB MRD pellets in a 500mm Panthera. The barrel is a 1:24 twist standard Superior STX liner and I have the 4mm head 12 g hammer weight. So far I can get pretty good 50yd groups when I get the pellets to fly around 900fps. My problem is that all the...

Michael, I believe there needs to be some clarification on how the TB Chronograph takes readings and displays the results. I had a conversation on AGN with one of the developers of the TB App about this very topic. The conversation started because I used the TB when I was shooting some of...

Hi, It really depends on what pellet you plan to shoot. I have a 380mm Crown MkII in .177 as my backup Hunter Class FT rig (the primary is a Crown MkII in .177 with a 500mm barrel). I found the 500mm barrel to be just a bit more accurate and consistent. I used JSB 13.4 gr Monsters (old...

Welcome to the group! Shooting well on these targets is a lot more difficult than it would seem to be. For your first try on a windy day your card wasn't that bad. Shooting more cards will allow you to get a better feeling for how your rifle shoots in the different wind conditions and what...

Hey Tom, What I think I am realizing is that you can be your own worst enemy in trying too hard to be perfect. There is a certain amount of randomness in the POI. On my 40 yd targets shooting the 18.1gr pellets it seems that no matter what combination of pellet head size and weight I...

Tom, An interesting point. I think I need to include the weather data with my analysis. That particular card was shot with the winds fairly light, 2-4 mph at my 2 o'clock. I have other cards where the shift due to higher winds is evident. I have a couple of cards for my .177 pellets (in...

Hi Guys, Had an interesting insight as I was analyzing the cards I shot as part of the data collection for my pellet sorting experiment. I weighed and measured 192 of the FX 18.1gr pellets and then shot them at the 40yd Challenge cards. Shot eight cards over two days, recording the...

Nice job with the mounting! How thick did you build up the epoxy on the inside? Cheers, Greg