ffg vs fffg for shorter barrels

[mitch184]

Knight ultralight... 24" barrel, 1:28 twist, 300 grain bullet.

Knight does a blanket recommendation of ffg powder for there guns.  I've run 110gr. of this and it shoots good.  Given fffg is slightly faster burning and generally you need less to be equivalent,  is there any advantage to going with fffg for shorter, 24", barrels?

2 things I see...

1st....shorter barrel means less time to completely burn.  At some point, it would seem that too much ffg wouldn't burn completely before the bullet leaves the barrel.  Not sure if this is above or below 120 gr.  If above, guess it's a moot point.

2nd... if you can get the same velocity out of 110gr. of fffg or 120 gr. of ffg.... the smaller and shorter load of the fffg leaves more usable barrel length.

In reality I need to just shoot both, but food for thought and figured I'd ask.

[reelamin]

As you said you just need to shoot them both over a chronograph.  The results in your rifle might be 180 degrees from what "it should be".  In mine T7 3F almost equaled the velocity I was getting from BH209 with a lot less blow back through the nipple.

[Sabotloader]

Knight ultralight... 24" barrel, 1:28 twist, 300 grain bullet.

Knight does a blanket recommendation of ffg powder for there guns.  I've run 110gr. of this and it shoots good.  Given fffg is slightly faster burning and generally you need less to be equivalent,  is there any advantage to going with fffg for shorter, 24", barrels?

2 things I see...

1st....shorter barrel means less time to completely burn.  At some point, it would seem that too much ffg wouldn't burn completely before the bullet leaves the barrel.  Not sure if this is above or below 120 gr.  If above, guess it's a moot point.

2nd... if you can get the same velocity out of 110gr. of fffg or 120 gr. of ffg.... the smaller and shorter load of the fffg leaves more usable barrel length.

In reality I need to just shoot both, but food for thought and figured I'd ask.

In the weather you hunt in - I would stay with 2f.  Over here when we are late season hunting the temps are often sub zero or in that area - those kind of temps I switch to 3f as it is easier to ignite.

Hornady says about a 5% uptake in velocity with same grains of 2f to 3f.. through the chrono - I do not always see it.