Quote from: Ironman482 on October 12, 2021, 11:45:55 AMIt's raining here , so I decided to zero the scope at 15 yrds in the shop , not good , 5 inch group at 15 , I believe the hunter supply slugs are too small ,I ck'ed them with my cheap digital calipers earlier and they measured 456-457 , so I got the made in USA omega mic and the slugs are 454- 455 mostly 454 so I ordered 3 different weights from NSA at 457 ,that's the largest he makes , I'm thinking 458 would be even better ,we'll. SeeStrait walled .457 swaged slugs keyhole and are big groups at the target for me. I smash the NSA slugs down to expand the base a little and then resize them with a .463 die to make them seal and fit better. The groups tighten up that way, but still not moa at 50 yards.
It's raining here , so I decided to zero the scope at 15 yrds in the shop , not good , 5 inch group at 15 , I believe the hunter supply slugs are too small ,I ck'ed them with my cheap digital calipers earlier and they measured 456-457 , so I got the made in USA omega mic and the slugs are 454- 455 mostly 454 so I ordered 3 different weights from NSA at 457 ,that's the largest he makes , I'm thinking 458 would be even better ,we'll. See
Because the shroud tube and baffles don't have much effect on the noise level of the 457, this $25.00 experiment ensued today. It changed both the shot characteristics and noise level. A 6" version that incorporates the existing shroud and an extension will definitely be more effective, but this will work for the time being. The next experiment for accuracy is with a barrel tuner on there, as I'm sure this has a bit of barrel whip to it.On another note, the single added (steel) weight shim was good for an additional 20 fps, but at the expenses of a large extreme spread, and noticable waisted air pressure. Sized 220 grainers are now pushed around 960 for three shots, with a bell curve and an extreme spread of 5 fps with the stock spring. Versus the 980, 950 930 fps starting at the same 3200psi pressure and weight shim. Three aluminum shims worked nearly the but with heavier cocking effort. Even going with higher fill pressures resulted in the same 20-30 FPS spreads, which not worthy for long range accuracy.
Quote from: Airgun-hobbyist on November 15, 2021, 09:28:03 PMBecause the shroud tube and baffles don't have much effect on the noise level of the 457, this $25.00 experiment ensued today. It changed both the shot characteristics and noise level. A 6" version that incorporates the existing shroud and an extension will definitely be more effective, but this will work for the time being. The next experiment for accuracy is with a barrel tuner on there, as I'm sure this has a bit of barrel whip to it.On another note, the single added (steel) weight shim was good for an additional 20 fps, but at the expenses of a large extreme spread, and noticable waisted air pressure. Sized 220 grainers are now pushed around 960 for three shots, with a bell curve and an extreme spread of 5 fps with the stock spring. Versus the 980, 950 930 fps starting at the same 3200psi pressure and weight shim. Three aluminum shims worked nearly the but with heavier cocking effort. Even going with higher fill pressures resulted in the same 20-30 FPS spreads, which not worthy for long range accuracy.Are you saying three aluminum shims is the sweet spot? I might test tomorrow despite the wind.
Quote from: Spacebus on November 15, 2021, 10:09:41 PMQuote from: Airgun-hobbyist on November 15, 2021, 09:28:03 PMBecause the shroud tube and baffles don't have much effect on the noise level of the 457, this $25.00 experiment ensued today. It changed both the shot characteristics and noise level. A 6" version that incorporates the existing shroud and an extension will definitely be more effective, but this will work for the time being. The next experiment for accuracy is with a barrel tuner on there, as I'm sure this has a bit of barrel whip to it.On another note, the single added (steel) weight shim was good for an additional 20 fps, but at the expenses of a large extreme spread, and noticable waisted air pressure. Sized 220 grainers are now pushed around 960 for three shots, with a bell curve and an extreme spread of 5 fps with the stock spring. Versus the 980, 950 930 fps starting at the same 3200psi pressure and weight shim. Three aluminum shims worked nearly the but with heavier cocking effort. Even going with higher fill pressures resulted in the same 20-30 FPS spreads, which not worthy for long range accuracy.Are you saying three aluminum shims is the sweet spot? I might test tomorrow despite the wind. No, not for me. I'd rather have a tighter more consistent shot count for three shots with a big bore, as it makes it more accurate at longer ranges. The little additional PFE gain was not worth the loss of accuracy with the descending shot string the shims created. Trying the aluminum shims (with one, two, and three), the speed increased accordingly based on the additional spring tension. But cocking effort went up too. Then I tried a thick steel washer for some tension and weight. The speed was equal to using three aluminum washers in tension and weighed as much as four washers. I'd go this route if you were interested in all out power at the same fill pressure for the first shot. Also, the shims could use a bit on filing on the inside and outside to make them slightly smaller so they are easier to install and remove while testing. Otherwise it may be necessary to break down the whole gun to get them out.
I was out playing with my .45.. Actually I fire lapped the barrel with some of the NOE that I powder coated.. They dropped at .460 powder coated and sized to .462.. Rolled 5 of each 400,600 and 800 grit.. Still need to final polish and the crown probably need some attention.. Don't know if it made a difference yet.. But the sun was setting and I heard the head cow was perturbed off about something.. I seen something moving a coyote walking to outside of the corral.. Still had one fire lapping hollow point chambered.. Fast point and shoot.. Went down instantly..
Since you recovered the slug I assume you didn't get a pass through.
150 FPE is where you want a .357 shooting JSB pellets or light bullets
Quote from: Nomadic Pirate on November 21, 2021, 09:23:56 PM150 FPE is where you want a .357 shooting JSB pellets or light bulletsNOE makes a pellet mold in the same weight range as the JSB pellets, which is why I'm looking at the HP Max.
NOE makes a pellet mold in the same weight range as the JSB pellets, which is why I'm looking at the HP Max.
The 260gr .461 mold that I sent back to accurate molds came back yesterday and I cast some today they dropped at 460 with temp at 750 degrees ,guess that's gonna have to do .ran them Thru the 461 sizer anyway , tomorrow I'll shoot a mag over the chrony and then shootsome groups at 35 yrds , this is a flat nose design with two driving bands , hopefully they will group good .
Different alloy and different friction coefficient. Nothing magical about that. Try different hardness and you'll see what happens. Marko