What would you consider a hot shooting .25 cal?

[enazle]

What the most you have been able to get from your 25?

[rsterne]

It depends on if you're talking an airgun .25 cal barrel (0.250") using pellets.... or a PB barrel (0.257") with the heavier bullets available.... My .25 cal Disco (.25 LW barrel) has done 105 FPE with 42.4 gr. EunJin Points (1055 fps), and shoots Baracudas and anything lighter supersonic.... With 58.8 gr. Mr. Hollowpoints, it will hit 962 fps (121 FPE).... On the other hand, my .257 Hayabusa (Win. 25-20 barrel, 0.257" x 14" twist) has pushed 88 gr. bullets at over 900 fps (160+ FPE), and is currently tuned to shoot 66-88 gr. bullets at about 135 FPE.... Both of those are using 3000 psi fills (the Disco is modded to be safe at that level).... I understand that the Jack Haley Scandalous .257 has reached over 300 FPE at 4500 psi for a single shot, using over 100 gr. bullets and a 36" barrel.... The heavier the bullets the faster the twist you need to stabilze them.... An airgun barrel will max out at around 50-58 gr., a 14" twist 25-20 barrel is good up to about 90 gr., for heavier than that you need the 10" twist of a 25-35 or .257 Roberts barrel....

In PRACTICAL terms, limit yourself to 950 fps with whatever bullet you use, and at that velocity, the FPE is twice the bullet weight in grains.... 25 gr. = 50 FPE.... 50 gr. = 100 FPE.... etc.etc.... Pushing beyond that is going to waste air and likely to have accuracy problems as well.... 

Bob

[Monkeydad1969]

It depends on if you're talking an airgun .25 cal barrel (0.250") using pellets.... or a PB barrel (0.257") with the heavier bullets available.... My .25 cal Disco (.25 LW barrel) has done 105 FPE with 42.4 gr. EunJin Points (1055 fps), and shoots Baracudas and anything lighter supersonic.... With 58.8 gr. Mr. Hollowpoints, it will hit 962 fps (121 FPE).... On the other hand, my .257 Hayabusa (Win. 25-20 barrel, 0.257" x 14" twist) has pushed 88 gr. bullets at over 900 fps (160+ FPE), and is currently tuned to shoot 66-88 gr. bullets at about 135 FPE.... Both of those are using 3000 psi fills (the Disco is modded to be safe at that level).... I understand that the Jack Haley Scandalous .257 has reached over 300 FPE at 4500 psi for a single shot, using over 100 gr. bullets and a 36" barrel.... The heavier the bullets the faster the twist you need to stabilze them.... An airgun barrel will max out at around 50-58 gr., a 14" twist 25-20 barrel is good up to about 90 gr., for heavier than that you need the 10" twist of a 25-35 or .257 Roberts barrel....

In PRACTICAL terms, limit yourself to 950 fps with whatever bullet you use, and at that velocity, the FPE is twice the bullet weight in grains.... 25 gr. = 50 FPE.... 50 gr. = 100 FPE.... etc.etc.... Pushing beyond that is going to waste air and likely to have accuracy problems as well.... 

Bob

Very nice info...good to know.  Thanks for the knowledge, Bob.

Joe