Had today off from work - beautiful day in mid 70s (!) in Connecticut - so I played …
I had created a “40 Yard Challenge” target card. Tried it with my RTI Prophet Performance V1 .22 LR - set a new personal best.
My Prophet .22 was tuned for 100 yards - shooting 25.4g MRDs at 912fps.
Since its shooting so well, I didn’t want to touch the tune, but I had a new (to me) .30 cal barrel and Huma Mod 40 moderator in .30 that I was dying to try out on my Prophet…
… so I swapped barrels and pellet probes and shot my 1st .30 cal pellets with the Prophet. The 1st 2 groups were at 40 yards and the next 3 groups were at 50 - all were 1/2” or less ctc - some were really tight! Using FX (JSB) 44.8g pellets.
To my surprise, when I chronoed the 44.8g pellets they were going 850.2 fps…
I thought they would be going much slower.
In .22 cal it was shooting 25.4g @ 912fps = 47 ft/lbs.
In .30 cal (changing only barrel and pellet probe) it shoots 44.8g @ 850fps = 72 ft/lbs.
So it seems .30 cal is much more efficient than .22 - in that I gained 25ft/lbs of energy simply by swapping from .22 to .30 - leaving hammer spring and regulator exactly the same.
Does this sound correct ?
-Ed
I had created a “40 Yard Challenge” target card. Tried it with my RTI Prophet Performance V1 .22 LR - set a new personal best.
My Prophet .22 was tuned for 100 yards - shooting 25.4g MRDs at 912fps.
Since its shooting so well, I didn’t want to touch the tune, but I had a new (to me) .30 cal barrel and Huma Mod 40 moderator in .30 that I was dying to try out on my Prophet…
… so I swapped barrels and pellet probes and shot my 1st .30 cal pellets with the Prophet. The 1st 2 groups were at 40 yards and the next 3 groups were at 50 - all were 1/2” or less ctc - some were really tight! Using FX (JSB) 44.8g pellets.
To my surprise, when I chronoed the 44.8g pellets they were going 850.2 fps…
I thought they would be going much slower.
In .22 cal it was shooting 25.4g @ 912fps = 47 ft/lbs.
In .30 cal (changing only barrel and pellet probe) it shoots 44.8g @ 850fps = 72 ft/lbs.
So it seems .30 cal is much more efficient than .22 - in that I gained 25ft/lbs of energy simply by swapping from .22 to .30 - leaving hammer spring and regulator exactly the same.
Does this sound correct ?
-Ed