So I finally got around to installing a Vortek PG4 kit in my .177 R7 that's been sitting on my desk for way too long.
Here's the results. String 1 are Crosman CPHP 7.9's and String 2 are JSB Diabolo Exact 7.33's
When I pulled what I presumed to be the original spring and seal, my shot strings had extreme spreads in the low 60's FPS and standard deviations 16-19 FPS.
The shot cycle is very much improved with a quick thud and that's about it, along with much improved accuracy and grouping. Not to mention this little rifle is now an 8-8.5 ft. lb gun after the spring kit.
Here's the results. String 1 are Crosman CPHP 7.9's and String 2 are JSB Diabolo Exact 7.33's
When I pulled what I presumed to be the original spring and seal, my shot strings had extreme spreads in the low 60's FPS and standard deviations 16-19 FPS.
The shot cycle is very much improved with a quick thud and that's about it, along with much improved accuracy and grouping. Not to mention this little rifle is now an 8-8.5 ft. lb gun after the spring kit.
| String 1 | String 2 | |
| 1 | 679.00 | 719.00 |
| 2 | 683.00 | 726.00 |
| 3 | 671.00 | 718.00 |
| 4 | 678.00 | 719.00 |
| 5 | 680.00 | 731.00 |
| 6 | 675.00 | 720.00 |
| 7 | 680.00 | 714.00 |
| 8 | 672.00 | 724.00 |
| 9 | 674.00 | 726.00 |
| 10 | 672.00 | 721.00 |
| Individual String Statistics: | ||
| 1st 10 Shots | 2nd 10 Shots | |
| Min. | 671.00 | 714.00 |
| Max. | 683.00 | 731.00 |
| Average | 676.40 | 721.80 |
| Median | 676.50 | 720.50 |
| Extreme Spread | 12.00 | 17.00 |
| SD | 4.14 | 4.94 |
