Airgun Technologies Sizing Vulcan 3 .30

[cosmic]

Strange results from sizing.. The .306 pain to load and not the best velocity... The .305 seems to be the best and most even velocity of all 3.. The .304 falling off..
I figured the .306 would be the best by the chrono, seems I was wrong.. The best seems to be the .305 !! This is starting at 230 bar..
Name: 306
Notes: 241
Shots: 18
Average: 919 ft/s
SD: 55 ft/s
Min: 816 ft/s
Max: 979 ft/s
Spread: 163 ft/s
Power Factor Average: 59
Power Factor Low: 53
Power Factor High: 63
Barometric Pressure: 29 in Hg
Temperature: 69F
Bullet Weight: 65

Name: 305
Shots: 18
Average: 972 ft/s
SD: 11 ft/s
Min: 952 ft/s
Max: 991 ft/s
Spread: 39 ft/s
Power Factor Average: 63
Power Factor Low: 61
Power Factor High: 64
Barometric Pressure: 29 in Hg
Temperature: 70F
Bullet Weight: 65

 

[WorriedMan]

Been searching for most accurate slug in V3 .30 (700mm) since giving up on hard loading AVS .3063. Recent purchase from Pyramyd Air of two brands, Wildman and Javelin (Gen 2), two types each, all 60-grain, found decent grouping until British-made Wildman Hollow Point (WMS3060DB) Dish Base were hole in hole @ 50 yds. (Same Wildman slugs with flat base didn't do as well.) Recommend trying this next time you place a PA order. WM

 

[cosmic]

I will give it a try... I don't have any idea what my regulator is set at, since I don't have a tester for Huma regulator that came in the gun..
cosmic (Ray)

 

[MACTEN]

Strange results from sizing.. The .306 pain to load and not the best velocity... The .305 seems to be the best and most even velocity of all 3.. The .304 falling off..

I hate to tell you but you have a regulator problem or seal leak etc issue. I pulled my V3 out of the place it sleeps since last fall with a 270 bar fill and ran it over the chrono. AVS .3063 62.5gr and keep in mind it usually takes a few fills for my regulator tighten up better than this. None of your numbers look even close to where they should be ES or SD. Mine is a little sloppy from hibernating.

 

[ZekeZX10]

Strange results from sizing.. The .306 pain to load and not the best velocity... The .305 seems to be the best and most even velocity of all 3.. The .304 falling off..
I figured the .306 would be the best by the chrono, seems I was wrong.. The best seems to be the .305 !! This is starting at 230 bar..
Name: 306
Notes: 241
Shots: 18
Average: 919 ft/s
SD: 55 ft/s
Min: 816 ft/s
Max: 979 ft/s
Spread: 163 ft/s
Power Factor Average: 59
Power Factor Low: 53
Power Factor High: 63
Barometric Pressure: 29 in Hg
Temperature: 69F
Bullet Weight: 65

Name: 305
Shots: 18
Average: 972 ft/s
SD: 11 ft/s
Min: 952 ft/s
Max: 991 ft/s
Spread: 39 ft/s
Power Factor Average: 63
Power Factor Low: 61
Power Factor High: 64
Barometric Pressure: 29 in Hg
Temperature: 70F
Bullet Weight: 65

Strange results from sizing.. The .306 pain to load and not the best velocity... The .305 seems to be the best and most even velocity of all 3.. The .304 falling off..
I figured the .306 would be the best by the chrono, seems I was wrong.. The best seems to be the .305 !! This is starting at 230 bar..
Name: 306
Notes: 241
Shots: 18
Average: 919 ft/s
SD: 55 ft/s
Min: 816 ft/s
Max: 979 ft/s
Spread: 163 ft/s
Power Factor Average: 59
Power Factor Low: 53
Power Factor High: 63
Barometric Pressure: 29 in Hg
Temperature: 69F
Bullet Weight: 65

Name: 305
Shots: 18
Average: 972 ft/s
SD: 11 ft/s
Min: 952 ft/s
Max: 991 ft/s
Spread: 39 ft/s
Power Factor Average: 63
Power Factor Low: 61
Power Factor High: 64
Barometric Pressure: 29 in Hg
Temperature: 70F
Bullet Weight: 65

Need to adjust hammer spring tension, spreads are too big. Will help tighten up groups as well. Here's spreads I'm getting with 60gn Hollow Point .307 caliber (tad oversized) made on my Thor Press. Set up chrono at muzzle and then at 100 yards